€.0.U,/U.0.€. 821.316.026.027.3:-821.316.967.001,2.001 4,002.2.004.124083.73) 4 tee a COMMISSION ELECTROTECHNIQUE INTERNATIONALE WORME DE LACEL INTERNATIONAL ELECTROTECHNICAL COMMISSION VEC STANDARD Publication 298 ne dition ~ Secendeiton 1981 Appareillage sous envelope métallique pour courant alternatif de tensions assignées supérieures 4 1 kV et inférieures ou égales a 72,5 kV AC. metal-enclosed switchgear and controlgear for rated voltages above 1 kV and up to and including 72.5 kV on a eee ars ey word *®@ Sores satnesrs openas eens 62 9079 }f- 260 © cet 196: Droits de reproduction réservés — Copyright - all ight reserved vi de ete pion ne pat tre rou own sano por fs putnin my mts clad ay iu race fon' yay mem, whee meas, elgg phates Fosien. and mic, wth! praia wie Tom bine Bureau Central de la Commission Electrotechnique Internationale 1 re de Varembé Gentve, Suisse eete 298 O1EC 1981 * —3- CONTENTS Fonewor> Prevact SECTION ONE ~ GeneRat 1 Scope SECTION Two SERVICE CONDITIONS 2. Normal and special service conditions SECTION THREE ~ TERMS AND DEFINITIONS 3. Definitions SSecTION FOUR ~ RATED CHARACTERISTICS 4. Rating 41 Rated volage 42. Rated insulauon level 43. Rated frequenes $4 Rated normal current and temperature nie 4.5. Rated short-time withstand current 46 Rated peab withstand current 47 Rated duration of shor eieuit 418 Rated supply volage of closing and opening devices and auxiliary circuits 49 Rated suppl frequency of operating devices and auxiliary circuits 4.10 Rated pressure of compressed ess supply for operation SECTION FAVE ~ RULES FOR DESIGN AND CONSTRUCTION 5. Design and construction SL Requirements for hquids in switchgear and comtolgeat 5.2 Requirements for gases in switchgear and controlgear 53. Earthing $4 Ausiiry equipment 55 Dependent power closing 5.6 Stored energy closing 5.7 Operation of releases 58 Low and high pressure inerlocking devices 59 Nameplates 5.101 Degree of protection and internal faut 53.102 Enclosure . 51103 Partitions and shuuers 5.104 Disconnectors and earthing switches 5.108 Imerlocks 5.106 Provisions for dielectie tests ox cables Secviow Six ~ RULES FOR TYPE TESTS 6. Type tens 61 Dieter tens | 62. Radio interference voltage (RIV) tests 63. Temperauresnse sts 64 Measurement of the resistance ofthe main circuit 65. Sror-tine and peak withstand curent tests 9 9 2 2 21 2 21 2 2B 2 2B B 2 2 2s 2s 2s 25 25 2 2 31 2 35 3 a » 45 4“ 4“ 4“sy 298 © IEC 1981 * caeeeee 6.101 Venication of making and breaking capacities 6.102 Mechanical operation tess 6.103 Venfication of the degree of protection 6.104 Measurement of leakage curents 6.105 Weatherproofing test 6.106 Arcing due to internal fault ‘SECTION SevEN ~ RULES FOR ROUTINE TESTS 7. Routine ests 711 Power-fequency volage iss on the main circuit 72 Dielecurc tests on auntiary and control circuits 713. Measurement of the resistance ofthe main circuit 7.101 Mechanical operation tess - 702 Tests of auxiary elecuncal, paevmatc and hydraulic devices 7103 Venfication of the corect wiring ‘SECTION EiGHT ~ GENERAL INFORMATION 8. Guide to the selection of switching devices for service 9. Information to be given with enquires, tenders and orders SHI Information with enquires and orders 9102 Information with tenders 10. Roles for transpon, storage. erection and maintenance 10.1 Conditions dung transpon, storage and erection 102 Erection (mounting 103. Maintenance APPENDIX: AA — Internal fault [Anpexpin BB — Method of calculating the cross-sectional area of bare conductors with regard to thermal stresses due to ‘cures of shor uration ‘Arex. CC — Recommended method for the weatherproofing test for outdoor metal-enciosed switchgear and contol pear ‘Aprexpnx DD — Guide for voltage tests ater erection on ste AAppesix EE — Rated insulation kvel fr Series I Fiourrs Paes a a ° si 3H 31 si 33 3 33 3 3 n B s ” 8298 © 1EC 198) » INTERNATIONAL ELECTROTECHNICAL COMMISSION A.C. METAL-ENCLOSED SWITCHGEAR AND CONTROLGEAR FOR RATED VOLTAGES ABOVE 1 kV * AND UP TO AND INCLUDING 72.5 kV FOREWORD 1 The format decisions or agreements ofthe IEC on technical matters prepared by Technical Commitieson which ll he National Commtees having special interes therein are represented, express, as nearly as possible, an international consensus of opinion forthe subjects dealt with, “They have the form of recommendations for international use and they are accepted by the National Committees in that \ tn order to promote international unification, the TEC expresses the wish that al! National Committees should adopt the text of hc TEC recommendation for thir national rules in sofa as national conditions will permit. Any divergence between the IEC ‘Reommendation and the coresponding nana! rules shoul. afr as posible, be clearly indicated in the latter. PREFACE “Ths sundard has been prepared by Sub-Committee 17C: High-voltage Enclosed Switchgear and Controtgear, of IEC Tectia! Committee No. 17: Switchgear and Controlgear “The decision to revise LEC Publication 208 was taken by SubCommittee 17C during the mecting hed in The Hague in 1975, Drafis were aiscussed at the meetings Feld im Moscow in 1977 and in Sydney in 1979. As a result ofthe later meeting.» dra, Document 17C(Central Office34, was submitted to the National Commitee fr approval under the Six Monthy Rule in November es ‘The National Commiltees ofthe folowing countsies voted explicitly in favour of poblication: Australia Netherlands ‘Austria [New Zealand Belgium Norway Brazil Poland Bulgaria South Alfica Republic of) Canada Spain Chine Sweden Casthosiovakia Swiverland Exypt Turkey France Union of Soviet Socialist Republics Germany United Kingdom Ils United Sates of Ameria Japan ‘Tnis standard refers to LEC Publication 694: Common Clauses for High-voltage Switcheca: and Contolear Standards, whichis plicable unless otherwise specified in this standard In onde to sraplify the indication of corresponding requirements, the same ‘sumbering of clauses and sub-clauses is used a in Publication 698, Amendments to these clauses and subvclauses ae given unde the same references whilst additional sub-causes are numbered from 10|. Additional appendices are lettered AA, BB, et (ther TEC publications quoted i this standard PPubications Nos. S(1S1) (1978): Internationa Electrotechnical Vocabulary, (LE.V.). Chapter 151; Electrical and Magnetic Devices 'S481) (1974): International Electrotechnical Vocabulary (LEV). Chapter 44: Switchgear and Control: sea 56.2 (1971):— High-voltage Aiemating-curtent Cireuit-breakers, Pan 2: Rating 129(1975): _Altemating Current Disconnectors (olators) and Farthing Switches298 © IEC 1981 1370973) 243.1967) 466 (194): 5171975) 52911976): 16941980: oe Bushings for Aliemating Voltages above 1000. Recommended Methods of Tes for Electric Sienth of Soli Insulating Materials at Power Frequencies. High-voltage Insulation-enclosed Switchgear and Controlgcat Hih-voliage Metal-enclosed Switchgear for Rated Voltages of 72.5 KV and above CCiassification of Degrees of Protection Provided by Enclosures ‘Common Clauses for High-volage Switchgear and Contolgcar Standards¢@ ne 298 © 1EC 1981 —u— A.C. METAL-ENCLOSED SWITCHGEAR AND CONTROLGEAR FOR RATED VOLTAGES ABOVE 1 kV AND UP TO AND INCLUDING 72.5 kV SECTION ONE - GENERAL 1. Scope This standard specifies requirements for factory-assembled metal-enclosed switchgear and con- ‘trolgear for alternating current of rated voltages above 1 kV and up to and including 72.5 kV for indoor and outdoor installation, and for service frequencies up to and including 60 Hz. Metal-enclosed switchgear and controlgear for special use, for example in flammable atmo- spheres, in mines or on board ships, may be subject to additional requirements, This standard does not deal with components contained in metal-enclosed switchgear and con- wolgear for which individual specifications exist. [Notes 1. = Switchgear and controler assemblies having an insulation enclosure are covered by TEC Publication 466 High-volige Insulation-enclosed Switchgear and Coatrlgeat. 2.~ While this standard also covers metal-enclosed switchgear and controgear of which the insulation isan insulating ‘as other than air at atmospheric pressure, additional requirements for such equipment may apply depending ‘pon its design (see EC Publication $17: High-voliagr Meta-enclosed Switchgear for Rated Volages of 72.5 and above). SECTION TWO — SERVICE CONDITIONS 2. Normal and special service conditions Unless otherwise specified in this standard, the metal-enclosed switchgear and controlgear is, designed to be used under normal service conditions. Refer to Clause 2 of IEC Publication 694: Common Clauses for High-voltage Switchgear and Controlgear Standards, with the following modification For indoor installation it is assumed that inside the enclosure the humidity may attain high values, but condensation on the equipment does normally not occur. Note. ~ Condensation may be prevented by special design ofthe building or room housing the metal-enclosed switchgear snd controgeat. For outdoor installation, itis assumed that inside the enclosure normal indoor conditions pre- vail. If necessary, appropriate measures shall be taken, such as air conditioning. so that common indoor components may be used.298 © IEC 1981 =p SECTION THREE — TERMS AND DEFINITIONS. 3, Definitions For the definitions of general terms used in this standard. reference is made to LEC Publica- tion 0441): International Electrotechnical Vocabulary, Chapter 441: Switchgear and Control- ‘gear. Additionally the following definitions apply for the purpose of this standard: 3.101 Switchgear and controlgear A general term covering switching devices and their combination with associated control, meas- uring. protective and regulating equipment. also assemblies of such devices and equipment with associated interconnections, accessories, enclosures and supporting structures. 3.102 Metal-enclosed switchgear and controlgear Switchgear and controlgear assemblies with an external metal enclosure intended to be earthed ’ ‘and complete except for external connections (I,E.V. 41-02-04), bis ote ~ Te means seca and coma ved ino tes = mca siya and conte Compre sce an onl honors non-eai tons) = Shee sneer an comes 3102.1 Metal-clad switchgear and controlgear {¢ Metal-enclosed switchgear and controlgear in which components are arranged in separate com- partments with metal partitions intended to be earthed. Noes 1, — This term applies to mets-enclosed switchgear and controlar with metal panitions providing the degree of protection included in Table I (or higher) nd having separaic compartments atleast forthe following com: ponents {a} each main switching device; 1) components connected to one sie of & main switching device, for ex ple feeder cient 6) components connected tothe other side ofthe main switching device, for example busbars; where more than ‘one st of busbers is provide, each st being in a separate compartment. 2. — Meual-enclosed switchpear and contolgear having metal partions and meeting all the requirements of Note I ‘may uillze an insulating shutte:barer as apart ofthe shuter arrangement. the combination of which wovides the degsee of protection included i Table I (or higher) and satisfies the requirements of Sub-clause 5.1031 for partitions and shutters made of insulating materia. @ 3102.2 Comparimented switchgear and controlgear (with non-metallic partitions) { £2 ‘Metal-enclosed switchgear and controlgear in which components are arranged in separate com: partments as for metal-clad switchgear and controlgear, but with one or more non-metallic parti- tions providing the degree of protection included in Table I (or higher) [Nowe ~ Mewl-encosed swtchgets and contolgeacin which he min iit componcsisare individ embedded solid Insulating material can be considered as an alirntive. provided thatthe conditions specified m 1EC Publication 466 are met 3.102.3. Cubicle switchgear and conirolgear Metal-enclosed switchgear and controlgear, other than metal-clad and compartmented switch- ‘gear and controlgear. ‘Nove. ~ This erm applies to switchgear and controlgear having a metal Yosute and having either i 4) a number of compariments less than that required for metal-lat or compartmented switchgear and contro!- i ser,298 ©1EC 1981+ Sis 1 partion having a degree of protection lowe than thse clued in Table Bo panivons 3.103 Transport unit A part of metal-enclosed switchgear and controlgear suitable for shipment without being dis- mantled 3.104 Functional unit A part of metal-enclosed switchgear and controlgear comprising all the components of the main circuits and auxiliary circuits that contribute to the fulfilment of a single function. ‘Nore. — Functional units may be distinguished according othe function for which they are intended, for example: incoming nit, outgoing uit, ete 3.105 Enclosure A part of metal-enclosed switchgear and controlgear providing a specified degree of protection of equipment against external influences and a specified degree of protection against approach to or contact with live parts and against contact with moving parts. 3.106 Compartment A part of metal-enclosed switchgear and controlgear enclosed except for openings necessary for interconnection, control or ventilation. Notes 1.— A compartment may be designated bythe main component contained tesin.e eicui-breaker compartment busbar compartment etc 2. ~ Openings necessary fo interconnection between compartments are closed with bushings or other equivalent J. ~ Busbar compartments may extend through several functional units without the need for bushings or other equivalent means, 3.107 Component ‘An essential part of the main or earthing circuits of metal-enclosed switchgear and controlgear which serves a specific function (for example circuit-breaker, disconnector, switch, fuse, instrument transformer, bushing. busbar, etc). 3.108 Partition A part of metal-enclosed switchgear and controlgear separating one compartment from other compartments. Notes 1 — A partion becomes. part ofthe enclosure ft is eadilyaccessibe in any ofthe positions defined in Subvelsuses 314 0 3117 2.~ Ifa door is provided which can be closed in the postions defined in Sub-clauses 3.113 to 3.117 the partton behind the door isnot considereé a par of the enclosure 3.109 Shutter A part of metal-enclosed switchgear and controlgear that can be moved from a position where it permits contacts of a removable part to engage fixed contacts, toa position where it becomes a part of the enclosure or partition shielding the fixed contacts, 3.110 Removable part A part of metal-enclosed switchgear and controlgear that may be removed entirely from the metal-enclosed switchgear and controigear and replaced, even though the main circuit is alive. ——298 © 1EC 1981 q -1— 3.111 Withdrawable part A removable part of metal-enclosed switchgear and controlgear that can be moved 10 positions yy which an isolating distance or segregation between open contacts is established, while the y.y remains mechanically attached to the enclosure. 3.112. Segregation (of conductors) ‘An arrangement of conductors with earthed metal interposed between them in such # maui, that disruptive discharges can only occur to earth. [Note. — A segregation may be established betmeen the conductors a8 well as between the OPER COMES ff SW, ay device. u 3.113. Service position (connected position) The position of a removable part in which itis fully connected for its intended function 3.114 Earthing position The position of a removable part in which the closing ofa mechanical switching device causy ‘main circuit to be short-circuited and earthed, 3.115 Test position (of a withdrawable part) ‘The position of a withdrawable part in which an isolating distance or segregation is establishe the main circuit and in which the control circuits are connected. 3.116 Disconnected position (of @ withdrawable pan) ‘The position ofa withdrawable part in which an isolating distance or segregatio: is establisheu 1, the circuits of the withdrawable part. that part remaining mechanically attached ¥. the encl Note — In high-vohage meta-enclosed switchgear and controlger. the aunliary circuits may net be €sicrened 3.117 Removed position (of a removable part) 2 Yep The position of a removable part when it is outside and mechanically and eles: from the enclosure, 3.18 Main circuit All the conductive parts of metal-enciosed switchgear and controlgear include. 3! energy. is intended to transmit electrics [Note — Connections to voliage transformers are not considered part ofthe main circuit 3.119 Auxiliary circuit All the conductive parts of metal-enclosed switchgear and controlgear includ: than the main circuit) intended to control, measure, signal and regulate (Nore, — The ausiiary circuits of metal-enclosed switchgear and conrogear include the contro ane 2.22 tf) siting devices298 © IEC 1981 19 3.120. Rated value A quantity value assigned, generally by a manufacturer. for a specified operating condition of the metal-enclosed switchgear and controlgear (ILE.V. 1$1-04-03), Note — See Section Four for individual rated values. B21 Degree of protection The degree of protection provided by an enclosure to protect persons against contact with or approach to live parts and against contact with moving parts inside the enclosure and to protect the equipment against ingress of solid bodies. Ambient air temperature (of metal-enclosed switchgear and controlgear) ‘The temperature, determined under prescribed conditions. of the air surrounding the enclosure of metal-enclosed switchgear and controlgcar. 3.123. Disruptive discharge oh Phenomena associated with the failure of insulation under electric stress. in which the discharge i@ completely bridges the insulation under test. reducing the voltage between the electrodes 10 zero or nearly to zero. Auxes 1 = The term applies to sischares in soi guid and gaseous dielecincs anid to combinations of thes 2.—A disrupave discharge in a solid dielectric produces permancnt loss of diclecvc sitength (non-serestoring ‘insulation i a liquid or gaseous dicecek. the loss may be onls temporary (sllrestoring insulation) SECTION FOUR — RATED CHARACTERISTICS 4. Rating The ratings of metal-enclosed switchgear and controlgear are the following: 4a) Rated voltage and number of phases: b) Rated insulation level c) Rated frequency: d} Rated normal current (for main circuits) ¢/ Rated short-time withstand current (for main and earthing circuits) ne f) Rated peak withstand current, if applicable (for main and earthing circuits) g) Rated duration of short circuit 1h) Rated values of the components forming part of the metal-enclosed switchgear and controlgear including their operating devices and auxiliary equipment. For the co-ordination of rated voltages, rated short-time withstand currents, rated peak with: stand currents and rated normal currents of metal-enclosed switchgear and controlgear reference is ‘made 10 J EC Publication 56-2: High-voltage Alternating-current Circuit-breakers, Part 2: Rating. and to JEC Publication 129: Alternating Current Disconnectors (Isolators) and Earthing Switches. 41 Rated voltage Refer to Sub-clauses 4.1 and 4.1.1 of IEC Publication 694. | ‘Note. ~ Components forming part of metal-enclosed switchgear and controlgear may have indvidua! values ofrated voltage fn accordance with ther relevant standard298 O1EC 1981 * —ue 4.2 Rated insulation level Refer to Sub-clauses 4.2 and 4.2.1 of IEC Publication 694. For metal-enclosed switchgear and ccontrolgear the rated withstand voltage values. based on current practice in Canada and the United States of America. are given in the table of Appendix EE. 43° Rated frequency values: Refer to Sub-clause 4.3 of IEC Publication 694 with the addition of the following rated 16% Hz and 25 Hz 4.4 Rated normal current and temperature rise 44.1 Rated normal current Refer to Sub-clause 4.4.1 of IEC Publication 694 with the addition of the following para- Ne raph Some main circuits of metal-enclosed switchgear and controlgear (e-. busbars. feeder circuits. ete) may not have the same value of rated normal current 4.4.2 Temperature rise Refer to Sub-clause 4.4.2 of IEC Publication 694 with the addition of the following supple- ment The temperature rise of components contained in metal-enclosed switchgear and controlgear which are subject to individual specifications not covered by the scope of | EC Publication 694 shall not exceed the temperature-rise limits permitted in the relevant standard of that component, The temperature rise for accessible enclosures and covers shall not exceed 30 K. In the case of enclosures and covers which are accessible but need not be touched during normal operation, the temperature-rise limit may be increased by 10 K. When applying a temperature rise equal to or higher than 65 K for parts of the enclosure non- : accessible to operators, every precaution shall be taken to ensure that no damage is caused to the lw surrounding insulating materials. 4.8. Rated short-time withstand current Refer to Sub-clause 4.5 of IEC Publication 694, 4.6 Raied peak withstand current Refer to Sub-clause 4.6 of IEC Publication 694, [Note — tn principle, the rate shor-time withstand current and the rated pesk withstand curent of main circuit cannot ‘exceed the coresponding rated values ofthe weakest ofits series connected components. However, foreach ics fr compartment, advaniage may be taken of apparatus limiting the shor-circut current, suchas curent-limiing fuses, reactors, ete 4.7 Rated duration of short circuit Refer to Sub-clause 4.7 of IEC Publication 694,298 © TEC 1981, —3B— 48 Rated supply voltage of closing and opening devices and auxiliary circuits Refer to Sub-clause 4.8 of IEC Publication 694 49° Rated supply frequency of operating devices and auxiliary circuits Refer to Sub-clause 4.9 of IEC Publication 694. 4.10 Rated pressure of compressed gas supply for operation Refer to Sub-clause 4.10 of IEC Publication 694. SECTION FIVE — RULES FOR DESIGN AND CONSTRUCTION 5. Design and construction Metal-enclosed switchgear and controlgear shall be designed so that normal service, inspection and maintenance operations, including the usual checking of phase sequence, earthing of connected cables, locating of cable faults, voltage tests on connected cables or other apparatus and the elim- ination of dangerous electrostatic charges, can be carried out safely All components of the same rating and construction which may need to be replaced shall be interchangeable. If there are removable parts with different ratings and if parts are interchangeable within the assembly of metal-encloseé switchgear and controlgear. any possible combination of removable and fixed paris shall withstand the rated insulation leve! specified for the fixed parts of the equip- ment concerned. ‘The various components contained within the enclosure are subject to the individual specifica- tions applying to them, For main circuits with current limiting fuses, the manufacturer of the switchgear and controlgear may assign the fused short-circuit current. SL Requirements for liquids in switchgear and controlgear Refer to Sub-clause 5.1 of 1EC Publication 694 5.2. Reguirements for gases in switchgear and controlgear Refer to Sub-clause $.2 of IEC Publication 694 5.3. Earthing Refer to Sub-clause 5.3 of IEC Publication 694 with the addition of the following supplement concerning the earthing of metal-enclosed switchgear and controlgear: An earthing conductor shall be provided extending the whole length of the metal-enclosed ‘switchgear and controlgear. The current density in the earthing conductor. if of copper, shall not ‘exceed 200 A/mm? under the specified earth fault conditions; however, its cross-section area shall not be less than 30 mm’. It shall be terminated by an adequate terminal intended for connection to the earth system of the installation, Soot = Ifthe earthing conductor is not made of copper. equivalent thermsl and mechanical requirements shall be met.2ROIEC INI + —3— 54 55 56 57 58 59 In general, the continuity of the earth system shall be ensured taking into account the thermal and mechanical stresses caused by the current it may have to carry. The maximum value of earth fault currents depends upon the type of system neutral earthing employed and shall be indicated by the user. Where earthing connections have to carry the full three-phase short-circuit current (as in the case of the short-circuiting connections used for earthing devices) these connections shall be dimen- sioned accordingly. [Nowe ~ As guidance. reference is made 16a method of ealulaing cross-sectional aca of conductors given in App én'bh Each part of the main circuit which can be disconnected from the other parts shall be capable of being earthed. The enclosure of each functional unit shall be connected to this earthing conductor. All the ‘metallic parts intended to be earthed and not belonging to 2 main or auxiliary circuit, shal also be connected to the earthing conductor directly or through metallic structural pans. For the interconnection within the functional unit, fastening by bolting or welding is acceptable for providing electrical continuity between the frame, covers, doors. partitions or other structural parts. Doors of the high-voltage compartments shall be connected to the frame by adequate The metallic parts of a withdrawable part which are normally earthed shall also remain earth- connected in the test and disconnected position under the prescribed conditions for the isolating distance (see IEC Publication 129) and also in any intermediate position whilst the auxiliary circuits are not totally disconnected. Auxiliary equipment Refer to Sub-clause 5.4 of IEC Publication 694, Dependent power closing Refer to Sub-clause 5.5 of IEC Publication 694, Stored energy closing Refer to Sub-clause 5.6 of IEC Publication 694 Operation of releases Refer to Sub-clause 5,7 of IEC Publication 694, Low and high pressure interlocking devices Refer to Sub-clause 5.8 of IEC Publication 694, Nameplates Refer to Sub-clause 5.9 of IEC Publication 694 with the addition of the following supple- ment: ‘Metal-enclosed switchgear and controlgear, all their components and operating devices shall be provided with durable and clearly legible nameplates which shall contain the following infor- mation:28 OIEC 1981 * —27— S101 5.101 5.101 = manufacturer's name or trade mark: — type designation or serial number: — applicable rated values: — number of the relevant standard. ‘The nameplates of each functional unit shall be legible during normal service. The removable parts, if'any, shall have a separate nameplate with the data relating to the functional units they belong to. but this nameplate need only be legible when the removable part is in the removed position, Note. — The word “rated” need not appear on the nameplate Degree of protection and imernal fault 1 Protection of persons agains! approach to live parts and contact with moving parts For metal-clad and for compartmented switchgear and controlgear. the degree of protection shall be specified separately for the enclosure and for partitions. For cubicle switchgear and controigear. itis only necessary to specify the degree of protection for the enclosure, ‘The degree of protection shall be indicated by means of a designation specified in Table 1 The characteristic numeral indicates the degree of protection provided by the enclosure with respect to persons. also to the equipment inside the enclosure. Table I gives details of objects which will be “excluded” from the enclosure for each of the degrees of protection ‘The term “excluded” implies that a part of the body or an object held by a person, either will not emer the enclosure or, if it enters, that adequate clearance will be maintained and no moving part will be touched, Tasuel [eeweor [rata apis apt | ve of Protection aginst spproach ta hve part | poke | Toa cace oth ery pr | 2x | By fingers or similar objets of ameter greater than 12 mn | Fax [Bs ok wise of mtr rhc peat than 25 mi | i Tax | By wires of dameter or snips of icknes pene han A mm \ L ! 7 i | Na = The devon of he eye f pon sereinWo TEC Fabian, 39. Casita of Dap Protecion Provided bs Enclosures No dcprev of protection is proxided hy metal-enclosed switchgsar and contro far against harm angrss of water 2. Protection of equipment against external effects 4) Protection against ingress of solid bodies: No additional provisions beyond those in Sub-clause 5,101.1 are to be taken +) Protection against weather: Equipment for outdoor installation provided with appropriate pro- tective features is to be indicated by the characteristic leer W placed immediately after the letters IP,298O1EC 1981 * — 29 ©) Protection against atmospheric agents: The relevant service conditions shall be observed. sec Clause 2 5,101.3 Protection of equipment against mechanical damage Under consideration, For the time being the manufacturer shall be consulted where enclosures may be subjected to mechanical impacts or similar effects. 5.1014 Internal fault Failure within the enclosure of metal-enclosed switchgear and controlgear due either to a defect for an exceptional service condition or mal-operation may initiate an internal arc. There is little probability of such an event occurring in constructions which satisfy the require ments of this standard, but it cannot be completely disregarded, Such an event may lead to the risk of injury, if persons are present, but with an even lower probability Itis desirable that the highest possible degree of protection to persons should be provided. The ‘ principal objective should be to avoid such arcs or to limit their duration and consequences Experience has shown that faults are more likely to occur in some locations inside an enclosure than in others, so special atiemtion should be paid to these. For guidance, a list of such locations and of causes is given in Table AAI of Appendix AA. columns (1) and (2), Measures to decrease the probability of internal faults or to reduce the risk are recommended in column (3). Examples of measures to limit the consequences of internal faults are given in Table AAI of Appendix AA. If'such measures are considered to be insufficient, then, to cover only the case of an arc occurring, entirely in air within the enclosure of the metal-enclosed switchgear and controlgear, a test in accordance with Appendix AA may be agreed between the manufacturer and user to verify that the chosen criteria are fulfilled as agreed. Such a test should be unnecessary on those parts of circuits which are protected by current limiting devices, for example, fuses. ‘Note. ~ The overpressure in the building caused by arcing due to an intel (aul in the metal-enslosd switehgeur ane controlgear and the effects of the ejection of gases from pressure relief devices should be takes. nto consid 5.102 Enclosure 5.1021 General Enclosures shall be metalic. When the metalenctosed switchgear and controlgears installed. the enclosure shall provide at least the degree of protection specified in Table 1. It shall also assure protection in accordance with the folowing conditions: The floor surface, even if not metallic, may be considered as part ofthe enclosure. The measure to be taken in order to obtain the degree of protection provided by floor surfaces shall be subject to an agreement between manufacturer and user. The walls of a room shall not be considered as parts of the enclosure298 © IEC 1981 —3u— For outdoor installation, the manufacturer shall take into account the influence of climatic conditions, $102.2 Covers and doors Covers and doors which are parts of the enclosure shall be metallic, When they are closed. they shall provide the degree of protection specified for the enclosure. Covers or doors shall not be made of woven wire mesh. expanded metal or similar. When ventilating openings and vent outlets are incorporated in the cover or door, reference is made to Sub-clause 5,102.4 Two categories of covers or doors are recognized with regard to access to high-voltage compart- ments: 2) Those which need not be opened for the normal purposes of operation or maintenance (fixed covers). It shall not be possible for them to be opened. dismantled or removed without the use of tools. bj those which need to be opened for the normal purposes of operation (removable covers. doors). These shall not require tools for their opening or removal. They shall be provided with locking low facilities (for example. provision for padlocks). unless the safety of persons is assured by @ suitable interlocking device With metal-clad or comparimented switchgear and controlgear. covers oF doors should only be opened when the part of the main circuit comtained in the compartment being made accessible is dead. $102.3 Inspection windows Inspection windows shall provide at least the degree of protection specified for the enclosure. They shall be covered by a transparent sheet of mechanical strength comparable to that of the enclosure. Precautions shall be taken to prevent the formation of dangerous electrostatic charges. either by clearance or by electrostatic shielding (for example, @ suitable earthed wire-mesh on the inside of the window), The insulation between live parts of the main circuit and the inspection windows shall withstand the test voltages specified in Sub-clause 4.2.1 of IEC Publication 694 for voltage tests to earth and between poles 5,102.4 Ventilaring openings, vent outlets Ventilating openings and vent outlets shall be so arranged or shielded that the same degree of protection as that specified for the enclosure is obtained. Such ops mings may make use of wire mesh (or the like provided that it is of suitable mechanical strength ‘Ventilating openings and vent outlets shall be arranged in such @ way that eas or vapour escaping under pressure does not endanger the operator, 5.103 Partitions and shutters 5.1031. General Partitions and shutters shall provide at least the degree of protection spifed in Table I Partitions and shutters made of insulating material shall meet the follow ie Fequirements29BO1EC IVI * — 3 4) the insulation between live panis of the main circuit and the accessible surface of insulating. partitions and shutters shall withstand the test voltages specified in Sub-clause 4.2.1 of IEC Publication 694 for voltage tests to earth and between poles: +b) apart from mechanical strength, the insulating material shall withstand likewise the test voltages specified in Item a). The appropriate test methods given in EC Publication 243: Recom- mended Methods of Test for Electric Strength of Solid Insulating Materials at Power Frequen- cies. should be applied; ) the insulation between five parts of the main circuit and the inner surface of insulating partitions and shutiers facing these shall withstand at least 150% of the rated voltage of the equipment: d) if leakage current may reach the accessible side of the insulating partitions and shutters by @ continuous path over insulating surfaces or by a path broken only by small gaps of gas or liquid, it shall be not greater than 0.5 mA under the specified test conditions (see Sub-clause 6.104) Openings in the enclosure of metal-enclosed switchgear and controlgear and in the partitions of metal-clad or compartmented switchgear and controlgear through which contacts of removable paris engage fixed contacts shall be provided with automatic shutters properly operated in normal service operations to assure the protection of persons in any of the positions defined in Sub-clauses 3.113 to 3.117, If maintenance requirements imply that onc set of fined contacts shall be accessible through ‘opened shutters, all the shutters shall be provided with means of locking them independently in the closed position or it shall be possible to insert a screen to prevent the live set of the fixed contacts. being exposed ‘Note. ~ Conductors passing through meullic parinins ave insulated by bushings or other equivalent means and the open {ngs maybe provided bs bushings or shutters having nom-metalic pars. Bushings shall comply with TEC Publ ation 137: Bushings for Altemating Voltages shove 1060 ¥ $.103.2 Partitions Partitions of metal-clad switchgear and controlgear shall be metallic and earthed Partitions of compartmented and cubicle switchgear and controlgear may be non-metallic, pro- vided they do not become part of the enclosure in any ofthe positions defined, in Sub-clauses 3.114 to 3.117. If partitions become part of the enclosure with the removable part in any of these posi- . tions. they shall be metallic, earthed and provide the degree of protection specified for the enclo- sure. 5.1033 Shutters The shutters of the three types of metal-enclosed switchgear and controlgear may be either metallic or non-metallic. If shutters are of insulating material. they shall not become part of the enclosure. If they are metallic, they shall be earthed, and if they become part of the enclosure they shall provide the degree of protection specified for the enclosure. 5.104 Disconnectors and earthing switches The devices for ensuring the isolating distance between the high-voltage conductors are con- sidered to be disconnectors which shall comply wiv: JEC Publication 129, except for mechanical operation tests (see Sub-clauses 6.102 and 7.101).298 © TEC 1981 The requirement that it shall be possible to know the operating position of the disconnector or earthing switch is met, if one of the following conditions is fulfilled: = the isolating distance is visible: — the position of she withdrawable part, in relation to the fixed part is clearly visible and the positions corresponding to full connection and full isolation are clearly identified: = the position of the disconnector or earthing switch is indicated by a reliable indicating device, Any removable part shall be so attached to the fixed part that its contacts will not open inad- vertently duc to forces which may occur in service, in particular those due to a short circuit SAIS _Imnerlocks Interlocks between different components of the equipment are provided for reasons of safety and for convenience of operation. The following provisions are mandatory for main circuits a) Metal-enclosed switchgeas and consrolgear with removable parts The withdrawal or engagement of a circuit-breaker. switch or contactor shall be impossible unless it i in the open position The operation of a circuit-breaker, switch or contactor shall be impossible unless itis in the service. disconnected. removed, test oF earthing position. It shall be impossible to close the circust-breaker, switch or contactor in the service position unless itis connected to the auailiary circuit, unless itis designed to open automatically without 5 the use of an auxiliary circuit by Meral-enclosed switchgear and controlgcar without removable paris and provided with dis: connectors Interlocks shall be provided to prevent operation of disconnectors under conditions other than those they are intended for (see IEC Publication 129). The operation of a disconnector shall be impossible unless the associated circuit-breaker, switch or contactor is in the open position, Nove. ~ Thos rule may be disregarded 388 possibic to have busbar tr tous hushur eters withou current anteruption The operation of the circuit-breaker. switch or contactor shall be impossible unless the asso- ciated disconnector is in the closed. open or earthing position (if provided). The provision of additional or altemative interlocks shall by subject to agreement between manufacturer and user, The manufacturer shall give all necessary information on the character and function of interlocks. It is recommended that earthing switches having @ short-circuit making capacity less than the rated peak withstand current of the circuit should be interlocked with ihe associated disconnec- foe Apparatus installed in main circuits. the incorrect operation of which can cause damage or which are used for assuring isolating distances during maintenance work, shall be provided with locking facilities (for example, provision for padlocks), Nove, = Whenever practical, preference should be given to mechica interocks295 © IEC 1981 7 5.106 Provisions for dielectric tests on cables When it is not practical to disconnect the cable for the dielectric tests from the metal-enclosed ‘switchgear and controlgear. those parts which remain connected to the cable shall be capable of ‘withstanding the cable test voltages specified in the relevant cable standards. Note — Attention is drawn to the fact that practically no safety margin is left in some cases berween the ited power- frequency test vole forthe wolaing distance and the resulting vole ves acros the isolating distance due tothe application ofthe dc. cable test voltage. while the other sie ofthe isolaing distance of metal-enclosed switchgear and controlar 1 sl lve SECTION SIX — RULES FOR TYPE TESTS 6. Type tests Refer to Clause 6 of IEC Publication 694 with the addition of the following modification Components contained in metal-enclosed switchgear and controlgear which are subject to indi- vidual specifications not covered by the scope of IEC Publication 694 shall comply with and be tested in accordance with those specifications, taking into account the conditions given in the following sub-clauses. tative functional unit, Because of the vari The type tests are made on a repre of types, ratings and possible combinations of components, itis not practical to make type tests with all the arrangements of metal-enclosed switchgear and controlgear. The performance of any particular arrangement may be substantiated by test data of comparable arrangements. [Nove — A representative functional unit may take the form of one extensible unit However. it may be necessary to bolt to for three of such unite together ‘Other tests than those indicated hereafter can be carried out on metal-enclosed switchgear and controlgear including organic insulating materials. These tests are subject to agreement between manufacturer and user. The type tests and verifications comprise: Normal type tests Tests to verify the insulation level of the equipment including tests at power-frequency test voltages on auniliary circuits: Sub-clause 6.1 bb) Tests to prove the temperature rise of any part of the equipment and measurement of the resistance of the main circuit Sub-clauses6.32nd6.4 Tests t0 prove the capability of the main and earthing circuits 10 be subjected to the rated peak and the rated short-time withstand cur- rents Sub-clause 6.5 a Test 0 prove the making and breaking capacity of the included switching devices Sub-clause 6.101 ‘¢) Tests t0 prove the satisfactory operation of the included switching devices and removable pans: Sub-clause 6.102 J) Tests to verify the protection of persons against approach to live parts and contact with moving pants Sub-clause 6.103 8) Tests to verify the protection of persons against dangerous electrical effets Sub-clause 6.104298 O1EC 1981 * — 39 Special type tests (subject to agreement between manufacturer and user) 1h) Tests to verify the protection of the equipment against external effects due to weather and atmospheric agents: Sub-clause 6.105 i) Tests to verify the protection of the equipment against mechanical damage: Sub-clause 5.101.3 Jj} Tests to assess the effects of arcing due to an internal fault: Sub-clause 6.106 ) Tests to detect certain defects in the solid insulation of the equipment by the measurement of partial discharges: Sub-clause 6.1.9 Nore. ~ Some of the type tests may impair the suitability ofthe tested pars for subsequent use in service 6.1 Dielectric tests 6.1.1 Ambient air conditions during tests Refer to Sub-clause 6.1.1 of LEC Publication 694 with the following limitation: Where the insulation of metal-enclosed switchgear and controlgear comprises atmospheric air, voltage tests shall be made in conditions as near as possible to the standard reference atmosphere. The application of correction factors for the air density and the humidity are allowed for the determination of the test voltage subject to agreement between manufacturer and user 6.1.2 Wer rest procedure 1EC Publication 694 is not applicable as no dielectric tests under wet conditions are necessary for metal-enclosed switchgear and controlgear 6.1.3 Conditions of switchgear and controlgear during dielectric tests Refer to Sub-clause 6.1.3 of IEC Publication 694 for those tests which are applicable, 6.14 Appl ges and test conditions 1EC Publication 694 is not applicable. Because of the great variety of designs. itis not feasible to give specific indications of the tests to be performed on the main circuit, but. in principle. they shall cover the following tests iow of test vol a Te car and honween phases ‘The test volages specified in Sub-clause 6.1.5 shall be applied connecting each phase conductor ofthe main circuit in turn to the high-voltage terminal of the test supply. All other conductors of the mais: circuit and the auxiliary circuits are to be connected to the earthing conductor or the frame ‘and to the earth terminal of the test supply The dielectric tests shall be made with all switching devices closed and all removable pants in their service position. Attention shall be given to the possibility that switching devices in their open position or removable parts in the disconnected, removed. test or earthing position, may result in less favourable fie conditions. Under such conditions the tests shall be repeated. Note. ~ The remova'* pars are not be subjected to these voltage test whilst hey are inthe disconnected. tet or removed position298 © IEC 1981 4 — For these dielectric tests. current transformers, any direct overcurrent release or overcurrent indicator and the cable terminal boxes (placed. if necessary, in several configurations if in doubt about the most unfavourable situation) should be installed as in normal service. In order to check compliance with the requirements of Sub-clause 5.102.3 and Item a! of Sub- clause 5,103.1 inspection windows. partitions and shutters of insulating material shall be covered on the side accessible during operation or maintenance. in the most unfavourable situation for the test, with a circular or square metal foil having an area as large as possible but not exceeding 100 cm!, which shall be connected to earth. In case of doubt about the most unfavourable situation, the tests shall be repeated with different situations, For convenience of testing. subject to agrec- ment between manufacturer and user. more than one metal foil may be applied simultaneously or larger parts of the insulating material may be covered by Across the isolating distance Each isolating distance of the main circuit shall be tested using the test voltages specified in Sub-clause 6.1.5. The isolating distance may be the distance between the two parts of the main Circuit intended 10 be connected by a withdrawn or removed switching device. fin the disconnected position, an earthed metallic shutter is interposed between the disengaged contacts to assure a segregation. the gap between the earthed metallic shutter and the live parts shall withstand only the test voltages required 10 earth If, in the disconnected position, there is no earthed metallic shutter or partition between the fixed part and the withdrawable part, the test voltages specified across the isolating distance shall be applied — between the fixed and moving contacts intended to engage. if conductive parts of the main Circuit of the withdrawable part can inadvertently be touched | — between the fixed contacts on one side and the fixed contacts on the other side, with the switch- ing device of the withdrawable part in the closed position. if they cannot inadvertently be { touched, ch Complementary tests In osder to check compliance with the requirement of Hem c/ of Sub-clause $.103.1. the insulation between the live parts of the main circuit and the inside of insulating partitions or shutters shall be subjected to a power-frequency test voltage of 150% of the rated voltage for | min after covering the y inner surface of the parntion or shutter facing the live parts by an earthed metal foil 6.1.5 Test voltages Refer to Sub-clause 4.2.1 of IEC Publication 694 The test voltages 10 earth and between phases shall be selected from Table I. columns (2) or (4) and (6), or the table of Appendix EE, columns (2) and (4). The test voltages across the isolating distance shall be selected from Table 1. columns (3) or (S) and (7), or the table of Appendin EE. columns (3) and (5) 6.1.6 Lighting and switching impulse voltage tests Refer to Sub-clause 6.1.6 of IEC Publication 694 with the addition of the following supple- ment: Metal-enclosed switchgear and controlgear shall be subjected to lightning impulse voltage tests only. Normally, the fifieen-impulse withstand test shall be applied. However, in the case whereQSOIEC III * —a3— non-self-restoring insulation predominates, the conventional impulse withstand test may be applied subject to agreement between manufacturer and user, 50 as 10 avoid possible damage to the solid insulation. Voltage transformers. power transformers or fuses may be replaced by replicas reproducing the field configuration of the high-voltage connections, Overvoltage protective devices shall be disconnected or removed. Current transformer seconda- ries shall be short-circuited and earthed. Current transformers with a low ratio may have the primaries short-circuited too. During the lightning impulse voltage tests. the earthed terminal of the impulse generator shall be connected to the enclosure of the metal-enclosed switchgear and controlgcar. except that during the tests in accordance with Item fy of Sub-clause 6.1.4 the enclosure shall. if necessary. be insulated from earth in order that the voltage appearing between any of the live parts and the enclosure will not eaceed the test voltage specified in Hem a/ of Sub-clause 6.1.4 6.1.7 Power-frequency voltage tests on the main circuit Refer to Sub-clause 6.1.7 of IEC Publication 694 with the addition of the following supple- ment The main circuits of metal-enclosed switchgear and controlgear shall be subjected to power- frequency voltage tests in dry conditions only Voltage transformers. power transformers or fuses may be replaced by replicas reproducing the field configuration of the high-voltage connections. Overvoltage protective devices may be discon- nected or removed, During the power-frequency voltage tests. one terminal of the test transformer shall be connected to earth and to the enclosure of the metal-enclosed switchgear and controlgear. except that during the tests in accordance with Item fy of Sub-clause 6.1.4 the mid-point or another intermediate point Qf the voltage source should be connected to earth and to the enclosure in order that the voltage appearing between any of the live parts and the enclosure will not exceed the test voltage specified in tem a/ of Sub-clause 6.1.4 If this is not practicable, one terminal of the test transformer may, with the agreement of the manufacturer, be connected to earth and the enclosure shall. if necessary. be insulated fro: earth | 6.1.8 Antficial pollution tests TEC Publication 694 is not applicable iarge tests Kefer to Sub-clause 6.1.9 of IEC Publication 694 and to Sub-clause 24.5 of IEC Publication 466 6.1.10 Dielectric tests on auxiliary and control circuits Refer to Sub-clause 6.1.10 of IEC Publication 694 which is applicable to all low voltage auxiliary circuits, Current transformer secondaries shall be short-circuited and disconnected from earth. Voltage transformer secondaries shall be disconnected,298 © TEC 1981 — 45 — 6.2 Radio interference voltage (RIV) tests TEC Publication 694 is not applicable. 6.3. Temperature-rise tests Refer to Sub-clause 6.3 of IEC Publication 694 with the addition of the following supple- ment Where the design provides alternative components or arrangements, the test shall be performed ‘with those components or arrangements for which the most severe conditions are obtained. The representative functional unit shall be mounted approximately as in normal service. including all normal enclosures, partitions, shutters. etc. and the covers and doors closed. The tests shall be made normally with the rated number of phases and the rated normal current flowing from one end of the length of busbars to the terminals provided for the connection of cables. ‘When testing individual functional units. the neighbouring units should carry the currents which produce the power loss corresponding to the rated conditions. It is admissible to simulate cquiv- alent conditions by means of heaters or heat insulation. ifthe test cannot be performed under actual conditions, ‘The temperature rises of the different components shall be referred to the ambient air empsra- ture outside the enclosure and shall not exceed the values specified for them in the relevant stan- dards. If the ambient air temperature is not constant, the surface temperature of an identical ‘enclosure may be taken under the same ambient conditions. 6.4 Measurement of the resistance of the main circuit Refer to Sub-clause 6.4 of IEC Publication 694 with the addition of the following paragraph The measured resistance across the complete main circuit of an assembly of metal-enclosed switchgear and controlgear is indicative of the proper condition of the current path, However, no tolerance can be specified 6.5. Short-time and peak withstand current tests Refer to Sub-clause 6.5 of IEC Publication 694. 68.101 Tests on main circuits Main circuits of metal-enclosed switchgear and controlgear shall be tested 10 verif} their cape bility 10 withstand the rated short-time and peak withstand current under the imended conditions of installation and use, ie, they shall be tesied as installed in the metal-caclosed switchgear and controlgear with all associated components influencing the performance or modifying the short circuit current. ‘The short-circuit current tests should preferably be carried out three-phase. The r.m.s. value of the short-circuit current during the test shall be obtained by applying the rated short-time withstand Current to the main circuit of metal-enclosed switchgear and controlgear. Short and direct connections between circuits having a high short-circuit current and currer limiting devices may be tested with a reduced short-circuit current, With the exception of protective devices which limit the value and the duration of the shor circuit current, itis necessary 10 ensure that no protective device operates. Current transforme:s298 © 1EC 198) + 4a land tripping devices which may’ be present shall be installed as in normal service, but with the release made inoperative. Current limiting fuses. if any, shall be provided with fuse-links having the maximum rated current specified After the test no deformation or damage to components or conductors within the enclosure which may impair good operation of the main circuits shall have been sustained. 65.102 Tests on earthing circuits Eanthing conductors, earthing connections and earthing devices of metal-enclosed switchgear and controlgear shall be tested to verify their capability to withstand the rated short-time and peak withstand current under the neutral earthing condition of the system. i.e. they shall be tested as installed in the metal-enclosed switchgear and controlgear with all associated components influ» eencing the performance or modifying the short-circuit current The short-circuit current tests with earthing devices should preferably be carried out three- phase. When there are removable parts, the earthing connection between the fixed part and the removable part shall be tested under earth fault conditions, The earth fault current shall Now between the earthing conductor and the frame of the removable part, The earthing connection between two removable paris. if any. shall also be tested After the test some deformation and degradation ofthe earthing conductor, earthing connections or earthing devices is permissible, but the continuity of the circuit shall be preserved. 6.101 Verification of making and breaking capacities Switching devices forming part of the main circuit of metal-enclosed switchgear and controlgear shall be tested to verify their rated making and breaking capacities according to the relevant standards and under the proper conditions of installation and use. ie. they shall be tested as normally installed in the metal-enclosed switchgear and controlgear with all associated components the arrangement of which may influence the performance, such as connections. supports, provi sions for venting etc Note — In determining which associated components atc hikely te inlucrce the performance. spesil ater shoul frver to mechanical forces duc 10 the shor efcuit, the venting of at products. ahe possibilas of disrupise (discharges. etc. Its recognized that. in some cases, such anluences may be quite nese 6.102 Mechanical operation tests 6.102.1 Switching devices and remosable parts Switching devices shall be operated $0 times and removable parts inserted 25 times and with drawn 25 times to verify satisfactory operation of the equipment 6102.2 Imterlocks The interlocks shall be se1 in the position intended 10 prevent thy operation of the switching devices and the insertion or withdrawal of removable paris. Fifty aticr pts shall be made to operate the switching devices and 25 attempts shall be made to insest and ~~ aitempts to withdraw the removable parts. During these tests only normal operating forces shal! be employed and no adjust- ‘ment shall be made to the switching devices, removable parts or 1nvtiocks.298 © EC 1981 —9o- The interlocks are considered to be satisfactory, i a) the switching devices cannot be operated; by the insertion and withdrawal of the removable parts is prevented; ¢) the switching devices, removable parts und the interlocks are in proper working order and the effort to operate them is practically the same before and after the tests. 6.103 Verification of the degree of protection The tests shall be performed in accordance with the requirements specified in Clause 7 of LEC Publication 529 for the appropriate first characteristic numeral. It shall be verified that the test instruments according to Table II cannot either — cause a lowering of the dielectric strength of the main circuit below the rated insulation level, or — touch moving parts inside the enclosure. or = in the case of 1P2: pass through openings in the enclosure or partition. e The test shall, however. be made only. if in the case of doubt as to whether the requirements are met Toate I r Dea of] “Test msrumients | 1 page 78) and rigid sphere | wx Standard metalic tet finger (Fi | (0f 12020 mm diameter | ‘Straight rigid steel wire of 2.5219, mm diameter | ht np fo wax Suraight gid sec! wiee of 1.0°f, mm diameter 6.104 Measurement of leakage currents When metal-enctosed swischgear and controlgear contain insulating partitions or shutters. the following tests shall be made in order to check compliance with the requirement of Item d of Sub-clause 5,103.1 The main circuit shall, at the discretion of the manufacturer, be connected either toa three-phase supply of power-frequency voltage equal to the rated voltage of the metal-enclosed switchgear and controlgear. with one phase connected to earth. or to a single-phase supply of a voltage equal to the rated voltage. the live parts of the main circuit being connected together. For three-phase tests. three measurements shall be made with the different phases of the supply successively connected to earth In the case of single-phase tests, only one measurement is necessary. A metal foil shall be placed in the most unfavourable situation for the test on the accessible surface of the insulation providing the protection against contact with live parts. In case of doubs about the most unfavourable situation, the test shall be repeated with different situations. ‘The metal foil shall be approximately circular or square, having an area as large as possible but not exceeding 100 em*. The enclosure and the frame of the metal-enclosed switchgear and control- gear shall be earthed. The leakage current flowing through the metal foil to earth shall be measured with the insulation dry and clean,| 28O1EC 1981 * —si— Ifthe value of the leakage current measured is more than 0.5 mA, the insulating surface does not Provide the protection required in this standard, If as indicated in Item d) of Sub-clause $.103.1, the continuous path over insulating surfaces is broken by small gaps of gas or liquid, such gaps shall be shorted out electrically. If these gaps are incorporated to avoid the passage of the Jeakage current from live parts to accessible parts of insulating partitions and shutters, the gaps shall withstand the test voltages specified in Sub-clause 4.2.1 of IEC Publication 694 for voltage tests to earth and between poles. Itis not necessary 10 measure leakage currents, if earthed metal parts are arranged in an appro- priate manner to ensure that leakage currents cannot reach the accessible parts of the insulating partitions and shutters 6.105 Weatherproofing test When agreed between manufacturer and user a weatherproofing test shall be made on metal- enclosed switchgear and controlgear intended for outdoor use. A recommended method is given in Appendix CC. This test also takes into account the effects of wind-driven snow. 6.106 Arcing due 10 internal fault This testis subject to an apreement between the manufacturer and user. If such a testis agreed. the procedure shall be in accordance with that described in Appendix AA. Nore — The test procedure represents the effects of an arc occurring entirely in atmospheric air within the enclosure when doors and covers are closed. but does not cover all cases. particularly those fas occurring within components SECTION SEVEN — RULES FOR ROUTINE TESTS 7. Routine tests The routine tests shall be made with each transport unit and. whenever practicable. at the ‘manufacturer's works to ensure that the product is in accordance with the equipment on which the type test has been carried out Refer to Clause 7 of IEC Publication 694 with the addition of the following routine tests — mechanical operation tests ‘Sub-clause 7.101, — tests of auxiliary electrical. pneumatic and hydraulic devices Sub-clause 7.102 = verification of the correct wiring Sub-clause 7.108 Note, 3t may be necessary to verify the interchangeabilty of componenis of the same raing and construction (see Cheuse 5) 71 Power-frequency voltage tesis on the main circuit Refer to Sub-clause 7.1 of IEC Publication 694 with the addition of the following supple- ment: ‘The metal-enclosed switchgear and controlgear is an assembly of components which individually have been subjected to appropriate routine tests. The tests according to this sv'-clause serve in principle, to prove the interconnections. The power-frequency voltage test shall be performed according to the requirements in Sub-clause 6.1.7. The test voltage specified in Table J, column (6), of IEC Publication 604 or the table of298 OIEC 1981 * — 3 ‘Appendix EE, column (4), shall be applied connecting each phase conductor of the main circuit in ‘turn to the high-voltage terminal of the test supply. with the other phase conductors connected to ‘earth, and the continuity of the main circuit assured (e.g. by closing the switching devices or otherwise). ‘Note. — On special request bythe user and n addition to these routine tests manufacture’ premises, dielectric ess witha reduced test voltage may be performed afer erection on site (see Appendix DD) 7.2. Dielectric tests on auxiliary and control circuits Refer to Sub-clause 7.2 of IEC Publication 694. 7.3. Measurement of the resistance of the main circuit TEC Publication 694 is not applicable. Subject to agreement between manufacturer and user the dc, voltage drop or resistance of each phase of the main circuit shall be measured under conditions ‘as nearly as possible similar to those under which the corresponding type test was carried out. 7.101 Mechanical operation tests Operation tests are made to ensure that the switching devices and removable paris comply with the prescribed operating conditions and that the mechanical interlocks work properly: During these tests which are performed without voltage on or current in the main circuits. it shalt be verified in particular. that the switching devices open and close correctly within the specified limits of the supply voltage and pressure of their operating devices. Each switching device and each removable part shall be tested as specified in Sub-clause 6.102 but substituting five operations or five attempts in each direction, 7.402 Tests of auxiliary electrical, pnewmatic and hydraulic devices ‘The electrical, pneumatic and other interlocks together with control devices having a predet mined sequence of operation shall be tested five times in succession in the intended conditions of use and operation and with the most unfavourable limit values of auxiliary supply. During the test no adjustment shall be made. The tests are considered to be satisfactory. if the auxiliary devices have operated properly. ifthey are in good operating condition after the tests and if the effort 10 operate them is practically the same before and afier the tests 7.103 Verification of the correct wiring It shall be verified that the wiring conforms with the diagram SECTION EIGHT — GENERAL INFORMATION 8, Guide to the selection of switching devices for service For a given duty in service. metal-enclosed switchgear and controlgear is selected by considering the individual rated values of their components required by normal load conditions and in the case of fault conditions.298 O1EC 1981 — ss It is desirable that the rated values are chosen as suggested in this standard regarding the characteristics of the system as well as its anticipated future development. The complete list of ratings is given in Clause 4, Other parameters such as local atmospheric and climatic conditions and the use at altitudes ‘exceeding 1000 m are also to be considered. ‘The duty imposed by fault conditions should be determined by calculating the fault currents at the place where the metal-enclosed switchgear and controlgear is to be located in the system, 9. Information to be given with enquiries, tenders and orders 9.101 Information with enquiries and orders When enquiring for or ordering an installation of metal-enclosed switchgear and controlgear the following information should be supplied by the enquirer: 1. Particulars of the system ‘Nominal and highest voltage, frequency, type of system neutral earthing 2. Service conditions Minimum and maximum ambient air temperature; any condition deviating from the normal service conditions or affecting the satisfactory operation of the equipment, as for example the unusual exposure to vapour, moisture, fumes, explosive gases. excessive dust or salt: the risk of earth tremors or other vibrations due to causes external to the equipment to be delivered. 3. Particulars of the installation and its components: 4) Indoor or outdoor installation. b) Number of phases. o) Number of busbars. d) Rated voltage. 6) Rated insulation level. f/ Rated normal currents of busbars and feeder circuits {@) Rated short-time withstand current (I) thy Rated duration of short cireuit (i diferent from 1s). iy Rated peak withstand current (if different from 2.5 Jy jy Rated values of components ‘kj Degree of protection for the enclosure and partitions. Circuit diagrams Type of metal-enclosed switchgear and controlgear (e.g metal-clad, compastmented or cubicle) 4, Particulars of the operating devices 4a) Type of operating devices, +b) Rated supply voltage (if any) ) Rated supply frequency (if any) ) Rated supply pressure (if any), ¢) Special interlocking requirements Beyond these items the enquirer should indicate every condition which might influence the tender or the order, as. for example. special mounting or erection conditions, the location of the external high-voltage connections or the rules for pressure vessels.298 © IEC 1981 —7— Information should be supplied if special type tests are required 9.102 Information with tenders ‘The following information, if applicable, should be given by the manufacturer with descriptive matters and drawings: 1, Rated values and characteristics as enumerated in Item 3) of Sub-clause 9.101. 2. Type test certificates or reports on request. 3. Constructional features, for example: 4) Mass of the heaviest transport unit. +b) Overall dimensions of the installation. ¢) Arrangement of the external connections. ) Facilites for transport and mounting. €) Mounting provisions. fi Instructions for operation and maintenance 4, Particulars of the operating devices: a 4) Types and rated values as enumerated in Item 4) of Sub-clause 9.101 b) Current or power for operation ©) Operating times 4) Quantity of free gas for operation 5. List of recommended spare parts which should be procured by the user. 10. Rules for transport, storage, erection and maintenance Refer to Clause 10 of JEC Publication 694 10.1 Conditions during transport, storage and erection Refer to Sub-clause 10.1 of IEC Publication 694. 10.2 Erection (mounting) Refer to Sub-clause 10.2 of IEC Publication 694. 10.3. Maintenance Refer to Sub-clause 10.3 of IEC Publication 694 with the addition of the following para- graph: If, for certain maintenance purposes. temporary inserted insulating screens are required, these screens shall be supplied by the manufacturer who shall also give advice about their usc. Such insulating screens shall meet the requirements of Sub-clause 5.103.1. They and their supports shall hhave sufficient mechanical strength to avoid incidental touching of live parts, (Nate. — Insulating seeens provide for mechanical protection only are not subject to this standard.298 © IEC 1981 — 59 — APPENDIX AA INTERNAL FAULT Tans AAT Locations, causes and examples of measures decreasing the probability of internal faults or reducing the risk Locations ‘where internal faults are ‘more likey to occur Possible causes of intemal faults Examples of measures o e ° Cable bores Inadequate design Selection of adequate dimensions Faulty installation ‘Avoidance of crossed cable connections. Checking of ‘workmanship on ste Failure of solid or quid insula-_| Checking of workmanship and/or dielectric test on sit = tion (defective or missing) ~~}"~~ Regular checking of liquid level isconnectors Mal-operation Imeriocks (se Sub-lause $105) Delayed reopening. In- ‘Switches dependent manual operation. Making capacity for Earthing switches ‘etches and earthing switches, Instructions to per= : sonnel Bolted connections Corrosion Use of corrosion inhibiting coatings and/or greases. ‘and contacts. Encapsulation, where possible. | Faulty assembly Checking of workmanship by suitable means —__— | Instrument trans Ferroresonance Avoidance ofthese electrical inuences by suitable denen former | of ee cree ee CCreuit-breakers Insuicient maintenance Regular programmed maintenance. Instructions to per sonnel, ‘Al locations Error by personnel Limitation of acess by comparimentation. Insulation ‘embedded live pars Instructions to personne ‘Agsing under electric stresses | Partial discharge routine test. | Pollution, moisture, ingress of | Measures to ensute thatthe specified service conditions dust, vermin, et ae achieved (se Clause 2). Overvotages Lightning protection. Adequate insulation co-ordination. Dielectric tess on sit.298 © 1EC 1981 -—a— ‘Tasuz AAI Examples of measures limiting the consequences of internal faults = Rapid fault clearance times initiate by detetorstenitve to light, pressure or heat or by a differential busbar protect ‘Application of suitable fuses in combination with switching devices to limit the le-through curent and fault duration Remote contro! = Pressure relief Maps METHOD FOR TESTING THE METAL-ENCLOSED SWITCHGEAR AND CONTROLGEAR UNDER CONDITIONS OF ARCING DUE TO AN INTERNAL FAULT AAI. Introduction ‘The occurrence of arcs inside metal-enclosed switchgear and controlgear is coupled with various physica! phenomena, For example, the arc energy resulting from an arc developed in air at atmospheric pressure will cause an internal overpressure and local overheating, which will result in mechanical and thermal stressing of the equipment. Morcover, the materials involved may produce hot decomposition products, either gaseous or vaporous, which may be discharged to the outside of the enclosure. This standard makes allowance for internal overpressure acting on covers, doors, inspection windows, etc., and also takes into consideration the thermal effects of the arc or its roots on the ‘enclosure and of ejected hot gases and glowing particles, but not damage to partitions and shutters Consequently, it does not cover all effects which may constitute a risk, such as toxic gases. More- over, the test procedure only simulates situations when doors and covers are closed and correctly secured. AA2. Types of accessibility =A distinction is made between the two types Of accessibility corresponding to the different test conditions given in Sub-clauses AAS.3.2 and AAS.3.3. The enclosure may have different types of accessibility on its various sides. Type A: Metal-enclosed switchgear and controlgear with accessibility restricted to authorized per- sonnel only. ‘Type B: Metal-enclosed switchgear and controlgear with unrestricted accessibility, including that of the general publi AA3. Test arrangements The choice of the functional units, their number, their equipment and their position in the room, as well as the place of initiation of the arc are to be decided upon in consultation. In each case, the following points shall be observed — the test should be carried out on a functional unit not previously subjected to arcing;OT 298 ©1EC 1981 -68- — the mounting conditions should be as close as possible to those of normal service. The room, should be represented at least by the floor, the ceiling, two perpendiculdr walls and the cable duets; — the functional unit should be fully equipped. Mock-ups of internal components are permitted provided they have the same volume and external material as the original items — the test unit shall be earthed at the point provided; = the arc shall not be initiated in such a way that it can be considered unrealistic in service conditions. AAS, Current and voltage applied AA41 General The tests on metal-enclosed switchgear and controlgear should be carried out three-phase. The short-circuit current applied during the testis to be stated by the manufacturer. It may be equal to or ower than the rated short-time withstand current AA42 Voltage The applied voltage of the test circuit should be equal to the rated voltage of the metal-enclosed switchgear and controlgear. A lower voltage may be chosen if the following conditions are met: 4) the current remains practically sinusoidal; ) the arc is not extinguished prematurely. AAS.3 Current AA43.1 A.C. component The short-circuit current, for which the metal-enclosed switchgear and controlgear is specified with respect to arcing should be set within a +5% —0 tolerance. These tolerances apply to the prospective current only if the applied voltage is equal to the rated voltage. The current should remain constant ‘ove = hes plat oes 0 permittee shoud be extended unite integral ofthe component ofthe comes * uate in eed wine lene of 10% =m Insc tar caren shoul he equa oe speed ‘value atleast dung tbe frst three half-yces and should not be less than SOM of he specified value atthe end ofthe A432. D.C. component : ‘The instant of closing should be chosen so that the prospective value of the peak current (with a tolerance of +5% —0%) flowing in one of the outer phases is 2.5 times the r.m.s. value of the a.c. component, defined in Sub-clause AA4.3.1, and so that a major loop also occurs in the other outer phase. If the voltage is lower than the rated voltage, the peak value of the short-circuit current for the metal-enclosed switchgear and controlgear under test should not drop below 90% of the pros- pective peak value. AAG4 Frequency ‘Ata rated frequency of 50 Hz or 60 Hz, the frequency at the beginning of the test should be between 48 Hz and 62 Hz. At other frequencies it should not deviate from the rated value by more than = 10%.i 298 ©1EC 1981 * — 65 — AAAS Duration of the test ‘The arc duration is chosen in relation to the probable duration of the arc, determined by the Protection facilities. ‘Note. — The arc duration should not exceed sup to an initia symmetrical short-circuit curent of 25 KA, Above 25 kA it should be consistent with the service conditions ofthe equipment. For testing metal-enclosed switchgear and controlgear provided with pressure relief flaps, merely for proving its resistance to pressure, an arc duration of 0.1 s is generally sufficient ‘Note. ~ Iisin general not posible to calculate the permissible arc duration fora curent which differ from that used inthe test. The maximum prescure during the test will generally not decrease witha shorter arcing time and ther i 90 universal rule according to which the permissible are duration may be increased with a lower test curren, AAS. Test procedure AAS.1. Supply circuit The neutral is only earthed in the case of metal-enclosed switchgear and controlgear to be oper- ated in a solidly earthed system, Care shall be taken in order that the connections do not alter the test conditions. Generally, inside the enclosure, the arc may be fed from two directions: the direction to be chosen 4s the one likely to result in the highest stress. AAS. Arc initiation The arc should be initiated between the phases by means of a metal wire of about 0.5 mm diameter or in the case of segregated phase conductors between one phase and earth In functional units where the live parts are covered by solid insulating material, the are should be initiated between two adjacent phases at joints or gaps of the insulation-embedded parts. The infeed from the supply circuit shall be three-phase to allow the fault to become three-phase. ‘Note. — The are shall not be initiated by perforating the slid insulation. The point of initiation shall be chosen so that the effects of the resultant arc produce the highest___ - stresses in the functional unit. In case of doubt it may be necessary to make more than one test on each funetional unit. AAS3. Indicators (for observing the thermal effects of gases) AAS3.1 General Indicators are pieces of black cotton cloth so arranged that their cut edges do not point toward the test unit. Care shall be taken to see that they cannot ignite each other. This is achieved by fitting them, for example, in a mounting frame of steel sheet (sce Figure 4. page 81). The indicator dimensions should be about 150 mm x 150 mm. AAS.3.2. Accessibility Type A Indicators should be fitted vertically at the operator's side of the metal-enclosed switchgear and controlgear and, if applicable, at sides which are readily accessible to personnel298 @1EC 1981 * - 6 They should be placed. up to a height of 2m and at a distance of 30 cm + 5% from the metal-enclosed switchgear and controlgear, facing all points where gas is likely 10 be emitted (eg. Joints, inspection windows, doors). If there is risk that gases may be deflected by nearby walls or the ceiling, indicators should also be arranged horizontally ata height of 2 m above the floor and between 30 em and 80 cm from the metal-enclosed switchgear and controlgear. Black cretonne (cotton fabric approximately 150 g/m?) should be used for the indicators, AAS.3.3. Accessibility Type B Indicators should be fitted vertically on all accessible sides of the metal-enclosed switchgear and controlgear. They should be placed. up to a height of 2 m and at a distance of 10 cm + 5% from the ‘metal-enclosed switchgear and controlgear, facing all points where gas is likely to be emitted (¢ Joints, inspection windows, doors). If there isa risk that gas may be deflected by nearby walls or the ceiling, indicators should also be arranged horizontally at a height of 2 m above the floor and between 10 em and 80 cm from the metal-enclosed switchgear and controlgear. If the test unit is lower than 2 m, indicators should also be placed horizontally on the top covers, close to the vertical indicators. For metal-enclosed switchgear and controlgear which is more than 2 m high, the indicators on the top covers can be omitted. Instead, indicators should be placed horizontally about 2 m above the floor and ata distance of 10 cm to 80 cm from the metal-enclosed switchgear and controlgear on all sides ~~ =a Black cotton-intertining lawn (approximately 40 g/m?) should be used for the indicators. AAG. Assessment of the test ‘The following criteria allow for the arcing effects listed in Clause AA1. Whoever requests the test to be performed shall decide by which of these criteria the results of the test should be assessed. It is to be observed: Criterion No. 1 ‘Whether correctly secured doors, covers etc., do not open. (Criterion No. 2 Whether parts (of the metal-enclosed switchgear and controlgear), which may cause a hazard, do not fly off. This includes large parts or those with sharp edges, for example, inspection windows, pressure relief flaps, cover plates, etc., made of metal or plastic Criterion No. 3 Whether arcing does not cause holes to develop in the freely accessible external parts of the enclosure as a result of burning or other effects. Criterion No. 4 ‘Whether the indicators arranged vertically (Sub-clause AS.3) do not ignite. Indicators ignited as 1 result of paint or stickers burning are excluded from this assessment.298 @1EC 1981 * -9- Criterion No. ‘Whether the indicators arranged horizontally (Sub-clause AAS.3) do not ignite. Should they start to bum during the test, the assessment criterion may be regarded as having been met, if proof is established of the fact that the ignition was caused by glowing particles rather than hot gases. Pictures taken by high-speed cameras should be produced in evidence. Criterion No. 6 ‘Whether all the earthing connections are still effective. Test report ‘The following information should be given in the test report: — Rating and description of the test unit with a drawing showing the main dimensions, details relevant to the mechanical strength, the arrangement of the pressure relief flaps and the method of fixing the metal-enclosed switchgear and controlgear to the floor and to the walls. — Arrangement of the test connections and the point of initiation of the arc. — Arrangement and material of indicators with respect to the type of accessibility. — For the prospective or test current: ‘a) rms. value of the a.c. component during the first three half-cycles; ) highest peak value; ) average value of the a.c. component over the actual duration of the test; 4) test duration, — Oscillogram(s) showing curremts and voltages. — Assessment of the test results — Other relevant remarks,298 O TEC 1981 * “ne APPENDIX BB METHOD OF CALCULATING THE CROSS-SECTIONAL AREA OF BARE CONDUCTORS WITH REGARD TO THERMAL STRESSES DUE TO CURRENTS. OF SHORT DURATION The following formula can be used to calculate the cross-section of bare conductors necessary to withstand the thermal stress due to currents with a duration of the order of 0.2 $ to 5 s. where Sis the cross-section, expressed in square millimetres 1 isthe rms. value ofthe current in amperes A psy weapons in A (2) ane se flowing ae aw (x 13, for copper sortie 85 for aluminium 45 for iron 25 for lead 1 isthe time, expresed in seconds ‘88 isthe temperature rise. expressed in Kelvins(K); for bare conductors. it is normally 180 K Ifthe time is more than 2s but less than 5, the value for A@ may be increased in the same formula to 215K. This takes account of the fact that the temperature rise is not strictly adiabatic.298 O1EC 1981 * aoe APPENDIX CC RECOMMENDED METHOD FOR THE WEATHERPROOFING TEST FOR OUTDOOR METAL-ENCLOSED SWITCHGEAR AND CONTROLGEAR The enclosure to be tested shall be fully equipped and complete with all fittings such as roof bushings, etc., and placed in the area to be su »plied with artificial precipitation. For installations comprising several functional units, a minimum of two units shal be used to test the joints between them; a roof joint shall be included ‘The artificial precipitation shall be supplied by a sufficient number of nozzles to produce 2 uniform spray over the surface under test. The various vertical surfaces of an enclosure may be tested separately, provided that a uniform spray is simultaneously applied also to both of the following: 1) the roof surface from nozzles located at a suitable height; 2) the floor outside the enclosure for a distance of 1 m in front of the surface under test with the enclosure located at the minimum height above the floor level specified by the manufacturer. Where the width of the equipment exceeds 3 m, the spray may be applied to 3.m wide sections in turn. Each nozzle used for this test shall deliver a Squaré-Shaped spray pattern with uniform spray distribu- tion and shall havea capacity of 30 I/min + 10% ata pressure of 46 N/cm? + 10% and a spray angle of 60° to 80°. The centre lines ofthe nozzles shall be inclined downwards so that the top of the spray is horizontal as it is directed towards the vertical and roof surfaces being tested. It is convenient to arrange the nozzles con a vertical stand-pipe and space them about 2 m apart (see the test arrangement in Figure 2, page 79), ‘The pressure in the feedpipe of the nozzles shall be 46 N/cm? + 10% under flow conditions. The rate at which water is applied to each surface under test shall be about $ mm/min, and each surface so tested shall receive this rate of artificial precipitation for a duration of 5 min, The spray nozzles shall be at a distance between 2.5 m and 3:m from the nearest vertical surface under test [Note ~ When nozzle acordance with Figure 3, pag 0, sued, the quantity of waters considered tobe in accordance with this standard when the pressre i 6 Niem? 310k Afier the test is completed, the enclosure shall beinspected promptly to determine whether the fol- lowing requirements have been met: 1) No water shall be visible on the insulation of the main and auxiliary circuits. 2) No water shall be visible on any electrical components or mechanisms of the equipment, 3) No significant accumulation of water shall be retained by the structure or other non-insulating parts (to minimize corrosion).2BO1EC II + 5 ! APPENDIX DD GUIDE FOR VOLTAGE TESTS AFTER ERECTION ON SITE ‘When agreed between manufacturer and user, power-frequency voltage tests in dry conditions may be carried out on the main circuits of metal-enclosed switchgear and controlgear after the erection on site in exactly the same manner as specified in Sub-clause 7.1 for the routine test at the manufacturer's prem- ises. ‘ The power-frequency test voltage shall be 80% of the values indicated in Sub-clause 7.1 and shall be applied to each phase conductor of the main circuit in succession with the other phase conductors earthed. For the tests, one terminal of the test transformer shall be connected to earth and to the enclosure of metal-enclosed switchgear and controlgear. Ifthe voltage test after erection on site replaces the routine test at the manufacturer's premises, the full power-frequency test voltage shall be applied. CDC. voltage test are under consideration.298 © IEC 1981 -17- APPENDIX EE RATED INSULATION LEVEL FOR SERIES Il (based on current practice in Canada and the United States of America) ‘This appendix gives for information the rated insulation levels for Series Il, based on current practice in Canada and the United States of America, for 60 Hz only. Rated power-requency Rated volage Rated lightning impulse v ‘withstand voliage withstand voltage (ems. valve) (peak value) (cams, value) Toeanh and ‘Acros the isolating Toeanh and ‘Across he isolating between phases distance bbermeen phases distance ayy «) av) ‘ayy ayy 0 @ ° o ° 476 o 6 9 2 828 15 8 2% 2 1s 95 os 36 0 155 10 x2 0 5s 258 12s 138 0 66 8 130 165 80 3 200 220 100 0 | ns 350 Bes 160 176- BR 298 © CEI 1981 Les deur aniculations du doigt peuvent Both joints of this finger may’ be bent tre pies sous un ange de 90° mais dans ‘through an angle of 9°, but in one and the tne tele et méme direction same direction only Dimensions en millimétres Dimensions in millimetres Tolerances: Tolerances: sures anges: + 5° ‘on angles: = 5° fur les dimensions ‘on linear dimensions inferieures 823 mm: 155 tess than 25 mim: "255 supércures 425 min: 02 over 25 mm: =02 Fic. 1. — Doigt d'épreuve normalisé Standard test finger.re 2801EC 1981 * -9- Environ a ‘About ca 2 —= = am ‘auteur minimate svidessus Gu 01 Minimum height above floor Fig. 2. — Disposition pour lessai de protection contre les intempéries. Arrangement for weatherproofing test.' -%— 298 © CEI 1981 i Body 2. | | | Dimensions en millimétre Dimensions in millimetres Fic. 3.— Lance poor Fessi de protection conte les ntempéries = ~ Nozze for weatherproofing test