JIS JAPANESE INDUSTRIAL STANDARD Translated and Published by Japanese Standards Association JIs G 3660-3-1 2003 (TEC 60811-3-1: 19% /Amd. 1:19 /Amd.2:20) (CMA) Common test methods for insulating and sheathing materials of electric and optical cables—Part 3-1 : Methods specific to PVC compounds—Pressure test at high temperature—Test for resistance to cracking ICS 29.035.20; 29.060.20 Reference number : JIS C 3660-3-1 : 2003 (E) PROTECTED BY COPYRIGHT 8sC 3660-3-1 : 2003 (IEC 60811-3-1: 1985/Amd.1 : 1994/Amd.2 : 2001) Foreword ‘This translation has been made based on the original Japanese Industrial Standard revised by the Minister of Eeonomy, ‘Trade and Industry through deliberations at the Japanese Industrial Standards Committee, as the result of proposal for revision of Japanese Industrial Standard submitted by The Japanese Electric Wire & Cable Makers’ Association (JCMA) with the draft being attached, based on the provision of Article 12 Clause I ofthe Industrial Standardization Law appli cable to the case of revision by the provision of Article 14 Consequently JIS C 8660-8-1 1998 is replaced with this Standard ‘This revision has been made based on TEC 60811-3-1 : 1985 Common test methods for insulating and sheathing materi als ofelectrie and optical eables—Part 3-1 Methods specifie to PVC compounds Pressure test at high temperature—Test for resistance to cracking for the purposes of making it easier to compare this Standard with International Standard; to ‘prepare Japanese Industrial Standard conforming with International Standard; and to propose a draft of an International Standard which is based on Japanese Industrial Standard Attention is drawa to the possibility that some parts of this Standard may conflict with a patent right, application for a patent after opening to the publi, utility model right or application for registration of utility model after opening to the public which have technical properties. The relevant Minister and the Japanese Industrial Standards Committee are ‘hot responsible for identifying the patent right, application for a patent after opening to the public, utility model right or application for registration of utility model after opening tothe public which have the said technieal properties, SIS C 3660 consists of the following parts and sections under the general title Common test methods for insulating and sheathing materials of electrie and optical cables: Part I-1 : Methods for general application—Measurement of thickness and overall dimensions—Tests for determining ‘the mechanical properties Part 1-2 : Methods for general application—Thermal ageing methods Part 1-3 Methods for general application—Methods for determining the density—Water absorption tests—Shrinkoge test Part 1-4 : Methods for genere! application—Test at low temperature Part 2-1 : Methods specific to elastomeric compounds—Ozone resistance, hot set and mineral oll immersion tests Part 3-1 : Methods specific to PVC compounds—Preesure ast at high temperature-—Test for resistance to cracking Part 3: Methods specific to PVC compounds—Section 2 : Loss of mass test—Thermal stability test Part 4: Methods specific to polyethylene and polypropylene compounds-—Section 1 : Resistance to environmental stress cracking—Wrapping test ofter thermal ageing én air—Measurement of melt low index-Carbon black and /or mineral filler content measurement in PE Part 4: Methods specific to polyethylene and polypropylene compounds—Scction 2: Elongation at break after pre-con ditioning-—Wrapping test after pre-conditioning—Wrapping test after thermal ageing in air—Measurement of mass in- crease—Long:-term stability test (Appendix A)—Test method for copper-catalysed oxidative degradation (Appendix B) Part 5: Methods speific to filling compounds—Section 1 : Drop point-—Separation of oilLower temperature britleness— otal acid number-—Absence to corrosive components—Permittivity at 28 C~D.C. resistivity at 23 °C and 100 °C. Date of Establishment: 1998-03-20 Date of Revision: 2009-09-20 Date of Public Notice in Official Gazette: 2003-09-22 Investigated by: Japanese Industrial Standards Committee Standards Board ‘Technical Committee on Electricity Technology JIS C 3660-3-1:2003, First English edition published in 2004-07 Translated and published by: Japanese Standards Association 4-1-24, Akasaka, Minato-ku, Tokyo, 107-8440 JAPAN In the event of any doubts arising as to the contents, the original JIS is to be the final authority. © 1A 2008 All rights reserved. Unless otherwise specified, no patt of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in Writing from the publisher Printed in Japan PROTECTED BY COPYRIGHTC 3660-3-1 : 2003 (IEC 60811-; :1985/Amd.1 : 1994/Amd.2 : 2001) Contents Introduction .. 1 General... ee 1 1.1 Scope .. 1 1.2 Normative references..... 1 2 Test values.. 2 3 Applicability ... : 2 4 Type tests and other tests .. ee 2 5 Pre-conditioning 2 6 — Test temperature 2 7 Median value = oo) 8 Pressure test at high temperature for insulations and sheaths 2 8.1 Test for insulations ... = 82 Test for sheaths .. 8.3 Test method using a dial micrometer 9 Tests for resistance of insulations and sheaths to cracking 6 9.1 Heat shock test for insulations... 6 9.2 Heat shock test for sheaths 8 @ PROTECTED BY COPYRIGHTJAPANESE INDUSTRIAL STANDARD JIS C 3660-3-1 : 2003 (TEC 60811-3-1 : 1985/Amd. 1 : 1994/Amd.2 : 2001) Common test methods for insulating and sheathing materials of electric and optical cables—Part 3-1: Methods specific to PVC compounds—Pressure test at high temperature—Test for resistance to cracking Introduction This Standard is the Japanese Industrial Standard prepared based on IEC 60811-3-1 Common test methods for insulating and sheathing materials of electric and optical cables—Part 3-1: Methods specific to PVC compounds—Pressure test at high temperature—Test for resistance to cracking published 1985 as the first edition, Amendment 1 (1994) and Amendment 2 (2001) without modifying their technical contents. Portions underlined with dots are the matters not stated in the original Interna- tional Standard. 1 General 1.1 Scope This Standard specifies the test methods to be used for testing poly- meric insulating and sheathing materials of electric cables for power distribution and telecommunications including cables used on ships. ‘This Standard gives the methods for pressure test at high temperature and for tests for resistance to cracking, which apply to PVC compounds. NOTE: The International Standards corresponding to this Standard are given below. In addition, symbols which denote the degree of correspondence in the contents between the relevant International Standard and JIS are IDT (identical), MOD (modified), and NEQ (not equivalent) according to ISO/IEC Guide 21. TEC 60811-3-1: 1985 Common test methods for insulating and sheath- ing materials of electric and optical cables—Part 3-1: Methods specific to PVC compounds—Pressure test at high temperature—Test for resistance to cracking, Amendment 1 (1994) and Amendment 2 (2001) apt) 1.2 Normative references The following standards contain provisions which, through reference in this Standard, constitute provisions of this Standard. If the indication of the year of publication is given to these referred standards, only the edition of indicated year constitutes the provision of this Standard but the revision and amendment made thereafter do not apply. The normative references without the indication of the year of coming into effect apply limiting only to the most recent edition (including amendments). PROTECTED BY COPYRIGHT2 C 3660-3-1 : 2003 (TEC 60811-3-1 : 1985/Amd. 1 : 1994/Amd.2 : 2001) JIS C 3660-1-1 Common test methods for insulating and sheathing materials of electric and optical cables—Part 1-1 : Methods for general appli- cation—Measurement of thickness and overall dimensions—Tests for determining the mechanical properties NOTE: IEC 60811-1-1: 1993 Common test methods for insulating and sheathing materials of electric and optical cables—Part 1-1 : Methods for general application—Measurement of thickness and overall dimensions—Tests for determining the mechanical properties and Amendment 1 (2001) are identical with the said standard. JIS C 3660-1-2 Common test methods for insulating and sheathing materials of electric and optical cables—Part 1-2 : Methods for general appli- cation—Thermal ageing methods NOTE: TEC 60811-1-2: 1985 Common test methods for insulating and sheathing materials of electric and optical cables—Part 1-2 : Methods for general application—Thermal ageing methods, Amendment 1 (1989) and Amend- ment 2 (2000) are identical with the said standard. 2 Test values Full test conditions (such as temperatures, durations, etc.) and full test requirements are not specified in this Standard; it is intended that they should be specified by the standard dealing with the relevant type of cable. Any test requirements which are given in this Standard may be modified by the relevant cable standard to suit the needs of a particular type of cable. 3 Applicability Conditioning values and testing parameters are specified for the most common types of insulating and sheathing compounds and of cables, wires and cords. 4 Type tests and other tests The test methods described in this Standard are intended, in the first instance, to be used for type tests. In certain tests, where there are essential differences between the conditions for type tests and those for more frequent tests, such as routine tests, these differences are indicated. 5 Pre-conditioning All the tests shall be carried out not less than 16 h after the extrusion or vulcanization (or cross-linking), if any, of the insulating or sheathing compounds. 6 Test temperature Unless otherwise specified, tests shall be carried out at room temperature. 7 Median value When several test results have been obtained and ordered in an increasing or decreasing succession, the median value is the middle value if the number of available values is odd, and is the mean of the two middle values if the number is even. 8 Pressure test at high temperature for insulations and sheaths NOTE: This test is not recommended for thicknesses of insulations and sheaths less than 0.4 mm. PROTECTED BY COPYRIGHT3 C 3660-3-1 : 2003 (IEC 60811-3-1 : 1985/Amd. 1 : 1994/Amd. 2 : 2001) 8.1 Test for insulations 8.1.1 Sampling For each core to be tested, three adjacent pieces shall be taken from a sample having a length of 250 mm to 500 mm. The length of each piece shall be 50 mm to 100 mm. ‘The cores of flat cords without sheaths shall not be separated. 8.1.2 Preparation of test pieces From each core piece taken in accordance with 8.1.1, any covering including semi-conducting layer, if any, shall be removed me- chanically. According to the type of cable, the test piece may have a circular or sector- shaped cross-section. 8.1.3 Position of each test piece in the test apparatus The indentation device is shown in figure 1, and consists of a rectangular blade with an edge 0.70+0.01 mm wide, which can be pressed against the test piece. Each test piece shall be placed in the position shown in figure 1, Flat cords without sheaths shall be laid on their flat side. Test pieces having a small diameter shall be fixed on the support in such a manner that they do not curve under the pressure of the blade. Test pieces of sector-shaped cores shall be placed on a support provided with a fitting sector-shaped profile as shown in figure 1. The force shall be applied in a direction perpendicular to the axis of the core; the blade shall also be perpendicular to the axis of the core. 8.1.4 Calculation of the compressing force The force 7, in newtons, which shall be exerted by the blade upon the test piece (of both round and sector-shaped cores) is given by the formula: where k is a coefficient which shall be specified in the standard for the type of cable if a value is given, or, if a value is not speci- fied in the cable standard, shall be: k: 0.6 for flexible cords and cores of flexible cables ke: 0.6 for cores, with D<15 mm, for cables for fixed instal- lations ke: 0.7 for cores, with D > 15 mm, and for sector-shaped cores for cables for fixed installations 65: mean value of the thickness of the insulation of the test, piece D: mean value of the outer diameter of the test piece 6 and D are both expressed in millimetres, to one decimal place, and measured on a thin slice cut from the end of the test piece, as specified in the test method in JIS C 3660-1-1 For sector-shaped cores, D is the mean value of the diameter of the “back” or circular part of the sector, in millimetres, to one decimal place. This is determined from three measurements, by means of a tape measure, of the circumference of the core assembly (the measurements being made at three different places on the as- sembled cores). PROTECTED BY COPYRIGHT4 C 3660-3-1 : 2003 (IEC 60811-3-1 : 1985/Amd. 1 : 1994/Amd.2: 2001) The force applied upon the piece of flat cord without sheath shall be twice the value given by the above formula, where D is the mean value of the minor dimen- sion of the test piece described in 8.1.1 ‘The calculated force may be rounded off down by not more than 3 %. 8.1.5 Heating of the loaded test pieces The test shall be carried out in an air oven in which the apparatus and test pieces are placed in a position free from vibra- tion or in an air oven which is mounted on an anti-vibration support. No apparatus likely to cause vibration, such as an air stirring mechanism, should be directly at- tached to the oven. ‘The temperature of the air shall be maintained continuously at the value speci- fied in the relevant cable standard. The loaded, but not pre-heated, test piece shall be kept in the test position for the time specified in the relevant cable standard, or, if the time is not specified in the cable standard, for the following times: 4h for test pieces having a value of Ds 15 mm; 6h for test pieces having a value of D>15 mm. 8.1.6 Chilling of the loaded test pieces At the end of the specified durations (see 8.1.5), the test piece shall be rapidly cooled under load. In the heating cabinet, this operation may be carried out by spraying the test piece with cold water on the spot where the blade is pressing. ‘The test piece shall be removed from the apparatus when it has cooled to a tem- perature where recovery of the insulation no longer occurs; the test piece shall then be cooled further by immersion in cold water. 8.1.7. Measurement of the indentation Immediately after cooling, the test piece shall be prepared for determining the depth of indentation. The conductor shall be withdrawn leaving the test piece in the form of a tube. A narrow strip shall be cut from the test piece in the direction of the axis of the core, perpendicular to the indentation as shown in figure 2. The strip shall be laid flat under a measuring microscope or a measuring projec- tor and the eross-wire shall be adjusted to the bottom of the indentation and the outside of the test piece as shown in the same figure. Small test pieces, up to about 6 mm external diameter, shall be cut transversely at and adjacent to the indentation, as shown in figure 3, and the depth of the inden- tation shall be determined as the difference between the microscope measurements on sectional views 1 and 2 as shown in the same figure. All measurements shall be made in millimetres to two decimal places. 8.1.8 Evaluation of results The median of the indentation values, measured on the three test pieces taken from each core, shall be not more than 50 % of the mean value of the thickness of the insulation of the test piece (as measured in accordance with 8.1.4). PROTECTED BY COPYRIGHT5 C 3660-3-1 : 2003 (TEC 60811-3-1 : 1985/Amd. 1 : 1994/Amd.2 : 2001) NOTE: The value of 50% is inseparable from the underlying principle of the formula and is the same for all materials. The severity of the test can be changed by variation of the factor k only, without altering the value of 50%. 8.2 Test for sheaths 8.2.1 Sampling For each sheath to be tested, three adjacent pieces shall be taken from a sample having a length of 250 mm to 500 mm from which the covering (if any) and all the internal parts (cores, fillers, inner covering, armour, etc., if any) have been removed. The length of each piece of sheathing shall be 50 mm to 100 mm (the higher val- ues for the larger diameters). 8.2.2. Preparation of test pieces From each piece of sheathing (see 8.2.1), a strip, of width equal to about one-third of the circumference, shall be cut parallel to the direction of the axis of the cable if the sheath does not have ridges. If the sheath has ridges caused by more than five cores, the strip shall be cut in the same manner and these ridges shall be removed by grinding. If the sheath shows ridges caused by five or less cores, the strip shall be cut in the direction of the ridges so that it contains at least one groove which lies approxi- mately in the middle of the strip throughout its length. If the sheath is directly applied on a concentric conductor, an armour or a metal- lie screen, and therefore has ridges which cannot be ground or cut away (unless the diameter is large), the sheath shall not be removed and the whole cable piece shall be used as a test piece. 8.2.3 Position of the test piece in the test apparatus The indentation device shall be the same as specified in 8.1.8 and shown in figure 1. ‘The strips shall be supported by a metal pin or tube, which may be halved in the direction of its axis to make a more stable support. ‘The radius of the pin or tube shall be approximately equal to half the inner di- ameter of the test piece. The apparatus, the strip and the supporting pin (tube) shall be arranged so that the pin supports the strip and the blade is pressed against the outer surface of the test piece. ‘The force shall be applied in a direction perpendicular to the axis of the pin (or of the cable when a whole cable piece is used) and the blade shall also be perpen- dicular to the axis of the pin or tube (or of the cable when a whole cable is used). 8.2.4 Calculation of the compressing force Unless otherwise specified, the force F, in newtons, which shall be exerted by the blade upon each test piece of sheath, shall be as given by the formula: F=k\2D5-® PROTECTED BY COPYRIGHT6 C 3660-3-1 : 2003 (IEC 60811-3-1 : 1985/Amd. 1: 1994/Amd.2 : 2001) where kis a coefficient which shall be as specified in the standard for the type of cable if a value is given, or, if no value is specified in the cable standard, shall be: k: 0.6 for flexible cords and cables k: 0.6 for cables for fixed installation having a value D <15 mm 0.7 for cables for fixed installation having a value D >15 mm and where 65: mean value of the thickness of the test piece of the sheath D: mean value of the outer diameter of the test piece of the sheath or for the sheath of a flat cable or cord, the minor outer dimension of the test piece of the sheath 6 and D are both expressed in millimetres, to one decimal place, and measured as specified in the test method of JIS C 3660-1-1, (D is the diameter of the cable from which the piece was cut). The calculated force may be rounded off downwards by not more than 3%. 8.2.5 Heating of the loaded test pieces The test pieces shall be heated as de- scribed in 8.1.5, for the time specified in the standard for the type of cable, or, if the time is not specified in the cable standard, for the following times: 4h for test pieces having an outer diameter not exceeding 15 mm 6h for test pieces with an outer diameter exceeding 15 mm 8.2.6 Chilling of the load test pieces The test pieces shall be chilled by the method described in 8.1.6. 8.2.7 Measurement of the indentation The indentation shall be measured on a narrow strip cut from the test piece, as described in 8.1.7 and shown in figure 2. 8.2.8 Evaluation of results The median of the indentation values measured on the three test pieces taken from the sheath under test shall be not more than 50 % of the mean value of the thickness of the sample when measured in accordance with 8.2.4. NOTE: The value of 50 % is inseparable from the underlying principle of the formula and is the same for all materials. The severity of the test can be changed by variation of the factor & only, without altering the value of 50 %. 8.3 Test method using a dial micrometer Under consideration. 9 Tests for resistance of insulations and sheaths to cracking 9.1 Heat shock test for insulations PROTECTED BY COPYRIGHT7 C 3660-3-1 : 2003 (IEC 60811-3-1 : 1985/Amd. 1 : 1994/Amd.2 : 2001) 9.1.1 Sampling Bach core to be tested shall be represented by two samples of suitable length taken from two places separated by at least 1 m. 9. External coverings, if any, shall be removed from the insulation. 2 Preparation of test pieces ‘The test pieces shall be prepared in one of the three following ways: a) b) ©) 9. for cores with an overall diameter not exceeding 12.5 mm, each test piece shall consist of a piece of core; for cores with an overall diameter exceeding 12.5 mm and having insulation thick- ness not exceeding 5 mm and for all sector-shaped cores, each test piece shall consist of a strip taken from the insulation whose width shall be at least 1.5 times its thickness, but not less than 4 mm; ‘The strip shall be cut in the direction of the axis of the conductor. In the case of sector-shaped cores, it shall be cut out of the “back” of the core; for cores with an overall diameter exceeding 12.5 mm and a wall thickness ex- ceeding 5.0 mm, each test piece shall consist of a strip cut in accordance with 9.1.2 b) and then ground or cut (avoiding heating) on the outer surface, to a thickness between 4.0 mm and 5.0 mm. This thickness shall be measured on the thicker part of the strip, whose width shall be at least 1.5 times the thick- ness. .8. Winding of test pieces on mandrels Each test piece shall be tautly wound and fixed, at ambient temperature, on a mandrel to form a close helix. a) b) ‘The diameter of the mandrel and the number of turns are given: in table 1 below for test pieces prepared in accordance with 9.1.2 a); for flat cables and cords, the mandrel diameter shall be based on the minor dimension of the core, which is wound on with its minor axis perpendicular to the man- drel Table 1 Mandrel diameter and number of turns with respect to the external diameter of test piece External diameter of test piece | Mandrel diameter | Number of turns (mm) (max) (om) Up to and including 2.5 5 6 Over 2.5 up to and including 4.5 9 6 Over 4.5 up to and including 6.5 13 6 Over 6.5 up to and including 9.5 19 4 Over 9.5 up to and including 12.5, 40 2 in table 2 below for test pieces prepared in accordance with 9.1.2 b) and 9.1.2 ¢). In this case, the inner surface of the test piece shall be in contact with the mandrel. PROTECTED BY COPYRIGHT8 C 3660-3-1 : 2003 (IEC 60811-3-1 : 1985/Amd. 1994/Amd.2 : 2001) Table 2 Mandrel diameter and number of turns with respect to the thickness of test piece External diameter of test piece | Mandrel diameter | Number of turns (nm) (max.) (am) Up to and including 1 2 6 Over 1 up to and including 2 4 6 Over 2 up to and including 3 6 6 Over 3 up to and including 4 8 4 Over 4 up to and including 5 10 2 For the application of tables 1 and 2, the diameter or thickness of each test piece shall be measured by means of calipers or any other suitable measuring instrument. 9.1.4 Heating and examination Each test piece, on its mandrel, shall be placed in an air oven pre-heated to the temperature specified in the standard for the type of cable, or, if no other temperature is specified in the cable standard, to 150 +3 °C. ‘The test piece shall be maintained at the specified temperature for 1 h. After the test pieces have been allowed to attain approximately ambient temperature, they shall be examined while still on the mandrel. 9.1.5 Evaluation of results The test pieces shall show no crack when examined with normal or corrected vision without magnification. 9.2 Heat shock test for sheaths 9.2.1 Sampling Each sheath to be tested shall be represented by two samples of cable of suitable length taken from two places, separated by at least 1 m. Any external coverings shall be removed. 2 Preparation of test pieces a) For sheaths with an overall diameter not exceeding 12.5 mm, each test piece shall consist of a piece of cable, except for polyethylene-insulated PVC sheathed cables b) For sheaths with an overall diameter exceeding 12.5 mm and with a wall thick- ness not exceeding 5.0 mm and for sheaths of polyethylene-insulated cables, each test piece shall consist of a strip taken from the sheath, whose width shall be at least 1.5 times its thickness but not less than 4 mm; the strip shall be cut in the direction of the axis of the cable. ) For sheaths with an overall diameter exceeding 12.5 mm and a wall thickness exceeding 5.0 mm, each test piece shall consist of a strip cut in accordance with item b) and then ground or cut (avoiding heating) on the outer surface, to a thickness between 4.0 mm and 5.0 mm. This thickness shall be measured on the thicker part of the strip, whose width shall be at least 1.5 times the thick- ness. PROTECTED BY COPYRIGHTd@ 9 C 3660-3-1 : 2003 (IEC 60811-3-1 : 1985/Amd. 1 : 1994/Amd.2 : 2001) For flat cables, if the width of the cable does not exceed 12.5 mm, each test piece shall be a piece of complete cable. If the width of the cable exceeds 12.5 mm, each test piece shall consist of a strip taken from the sheath as specified in 9.2.2 b). 9.2.3 Winding of the test pieces on mandrels Each test piece shall be tautly wound and fixed at ambient temperature on a mandrel. a) b) Of the test pieces prepared in accordance with 9.2.2 a) and 9.2.2 d), for the flat cords of the width not exceeding 12.5 mm, the diameter of the mandrel and the number of terns are given in 9.1.8 b). The diameter of the mandrel is wound in a manner that the shorter diameter becomes perpendicular to the mandrel. Of the test pieces prepared in accordance with 9.2.2 b) and c) and 9.2.2 d), for the flat cables of the width exceeding 12.5 mm, the diameter of the mandrel and the number of terns are given in 9.1.3 b). In this case, the inside surface of the test piece is made tightly touch the mandrel. The diameter or thickness of each test piece shall be measured by means of calipers or any other suitable measuring instrument. 9.2.4 Heating and examination In accordance with 9.1.4. 9.2.5 Evaluation of results In accordance with 9.1.5. Unit: mm 070 + 001 1=testing frame 2=sample 3a, 3b, 3c=supports 4=load Figure 1 Indentation device PROTECTED BY COPYRIGHT10. C 3660-3-1 : 2003 (IEC 60811-3-1 : 1985/Amd. 1 : 1994/Amd.2 : 2001) ‘Thin slice to be cut out 1 ZI Crose-wire of Vi the microscope ) Sectional view under microscope Figure 2. Measurement of indentation Unit: mm Sectional view 1 Sectional view 2 under measuring microscope Figure 3 Measurement of indentation for small test pieces Related standard: JIS C 3005 Test methods for rubber or plastic insulated wires and cables PROTECTED BY COPYRIGHTErrata for JIS (English edition) are printed in Standardization Journal, published monthly by the Japanese Standards Association, and also provided to subscribers of JIS (English edition) in Monthly Information. Errata will be provided upon request, please contact Standardization Promotion Department, Japanese Standards Association 4-1-24, Akasaka, Minato-ku, Tokyo, 107-8440 JAPAN TEL. 03-3583-8002 FAX. 03-3583.0462 100% Recycled paper PROTECTED BY COPYRIGHT