IS : 8224 - 1976

( Reaffirmed 2003 )

Indian Standard
SPECIFICATION FOR
ELECTRIC LIGHTING FITTINGS
FOR DIVISION 2 AREAS

( Second Reprint AUGUST 1997 )

UDC 628.95 : 621.326/.327

0 Copyright 1976

BUREAU OF INDIAN STANDARDS

MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG
NEW DELHI 110002
 IS : a224 - 1976

Indian Standard
SPECIFICATION FOR
ELECTRIC LIGHTING FITTINGS
FOR DIVISION 2 AREAS

Illuminating Engineering Sectional Committee, ETDC 45

Chairman Representing
SHRI V. A. KRISHNAMURTHY Central Public Works Department, New Delhi

Members
SURVEYOR 0~ WORKS III
( ELECT ) ( x'i~le~tlate
t0
Shri V. A. Krishnamurthy )
SHRI P. K. BANDYoPA~HY.~Y Philips India Ltd, Bombay
SHRI S. ROYCHOUDHARY ( Alternate )
WC-CDR H. S. BHATIA Directorate of Technical Development & Production
( Air ) ( Ministry of Defence )
SIIRI N. C. GUHA ( Alternate )
SHRI G. BI~ATTACHARYYA National Test House, Calcutta
Snnr D. S. Dostu Bajaj Electricals Ltd, Bombay
SHRI J~onrsn SHARAN ( Alternate )
SHRI K. L. GANG Directorate General of Supplies & Disposals,
New Delhi
SHRI J. S. PASJI ( Alternute )
SIIRI M. P. G~PT.\ Crompton Greaves Ltd, Bombay; and Indian
Engineering Association, Calcutta
SHRI S. F. MEHTA ( Alternate ) Crompton Greaves Ltd, Bombay
SHKI G. S. CHANDRASEKHER Indian Engineering Association, Calcutta
( A/tern&e )
SHRI T. S. K~J~AR Central Mining Research Station ( CSIR ), Dhanbad
SHRI U. S. Nro.m ( Al/em& )
SHRI B.H. MWATRE Bombay Electric Supply & Transport Undertaking,
Bombay
SHRI AVTAR SIN~~I ( Alternate )
SHRI K. N. N.4Dc:IIt Engineer-in-Chief’s Branch, Army Headquarters
M..\.~ J. K. SONI ( ~4lternate )
SHI%I J. l(. PARI General Electric Co of India Ltd, Calcutta
SHRI S. K. Nrronr ( &ernate )
SIIRI K. S. SARJI.\ National Phvsical Laboratory ( CSIR ), New Delhi
SHRI I. P. SrNoH Railwav Board i hlinistrv of.Railwavs , ,)
Snr:r AI. S. ARORA ( Alfernatc ) ’ ’ ’
SlUtI El. SISH\ Illuminating Engineering Socirty of India, Calcutta
SHRI K. li. Rorr.\~cr ( Aiternnfe )
( Continued on page 2 )

@I Co&right 1976
BUREAU OF INDIAN STANDARDS
This publication is protected under the Indian Copyrighf Acl_ ( XIV of 1957 ) and
reproduction in whole or in part by any means except with &ten permission of the
publisher shall be deemed to be an infringement of copyright under the said Act.
1 .
.-7
IS : 8224 - 1976

( Continuedjrom page I )
Members Rejresenting
Srrn1P.R. SURENDRANATEAW Central Labour Institute, Bombay
SHRI S. PURTJSEOTTAB~( Alternate )
SHRI S. P. SACHDEV, Director General, BlS ( Ex-ojicio Member )
Director ( Elec tech )

Secretary
SHRI A. K. GO~IA
Assistant Director ( Elec tech ), BIS

Flameproof and Allied Lighting Fittings Subcommittee, ETDC 45 : 1

Convener
DR G. N. BADAMI Central Building Research Institute ( CSIR ),
Roorkee

Members
SHRI U. N. BALIQA Baliga Lighting Equipment ( P ) Ltd, Madras
Dn T. S. BAJPAYEE Central Mining Research Station ( CSIR ), Dhanbad
SHRI S. K. RAY ( Ahnate )
fjHR1 s. K. BISWAS Directorate General of Mines Safety, Dhanbad
SHRI K. K. KHOSLA Jardine Victor Ltd, Calcutta
SHRI P. R. KIBE Paisa Fund Glass Works, Pune
SHRI V. V. HUYARIKAR ( Alternate )
SHRI MANAB ROY Sam Roth Et Co, Calcutta
SHRI I. N. MURTY Department of Explosives, Nagpur
.$&RI CHARANJ~ LAL ( Alternate )
SHRI N. NA~ARAJAN NationamchlCoal Development Corporation Ltd,

SHRI J. R. PARI General Electric Co of India Ltd, Calcutta

&RI B. G. GHOSHAL ( Alturnatc )
SFIRI P. R., S~RENDR~LNATRAN Central Labour Institute, Bombay
SERI G. N. TIIADANI Engineers India Ltd, New Delhi
SHRI S. KASTTJRIRAN~AN( Alternate )
SHRI T. R. VENKATESAN Ministry of Defcnce ( R & D )
SHRI C. K. SREEDHARAN( Alternate )

2
 IS I 8224- 1976

Indian Standard
SPECIFICATION FOR
BLECTRIC LIGHTING FITTINGS
FOR DIVISION 2 AREAS

0. FOREWORD
0.1 This Indian Standard was adopted by the Indian Standards Institution.
on 23 September 1976, after the draft finalized by the Illuminating
Engineering Sectional Committee had been approved by the Electro-
technical Division Council.
0.2 As a result of the extensive development of petrochemical industries,
need has been felt for formulation of Indian Standards for electrical
apparatus with type of protection ‘e’ in order to provide guidance to
manufacturers and approving authorities of these equipment in the
country. As a first step IS : 6381-1972* was published to cover general
requirements of such apparatus. This standard is intended to supplement
it with additional details as far as lighting fittings are concerned.
0.3 In preparing this standard, assistance has been derived from B. S.
4533 : Part 2 : 1969 ‘Electric lighting fittings, details requirements,
Section 2 : 1 Lighting fittings for division 2 areas’, issued by the British
Standards Institution.
0.4 For the purpose of deciding whether a particular requirement of this
standard is complied with, the final value, observed or calculated,
expressing the result of a test, shall be rounded off in accordance with
IS : 2-1960t. The number of significant places retained in the rounded
off value should be the same as that of the specified value in this standard.

1. SCOPE
1.1 This standard specifies requirements and tests for electric lighting
fittings for use in Division 2 areas as defined in IS : 5572 ( Part I )-1970:.
The fittings operate with either tungsten filament or electric discharge
lamps ( other than low pressure sodium vapour lamps ) on supply voltages
not exceeding 250 V.
-
*Specification for construction and testing of electrical apparatus with type of
protection ‘cr.
tRules for rounding off numerical values ( rcviscd ). ‘.
fclassification of hazardous areas for electrical installatidk~ Part I Areas having
gases and vapours.
3 .
%A-. -
1.2 This standard does not cover portable electric lighting fittings.

2. TERMINOLOGY

2.0 For the purpose of this standard, the following definitions shall apply.

2.1 Division 2 Area - An area within which any flammable or

explosive substance whether gas, vapour or volatile liquid, although
processed or stored, is so well under control that the formation of an
explosive or ignitable concentration in sufficient quantity to constitute. a
hazard is only likely under abnormal conditions.

2.2 Auxiliary Gear - Those items of control gear which are required
for the starting and operation of discharge lamps, for power factor
correction or radio interference suppression.

2.3 Enclosure -The external casing protecting the electrical and

mechanical parts of the apparatus.
2.4 Total Enclosure - A form of enclosure without openings specifically
for ventilation but not necessarily airtight.

2.4.1 Restricted Breathing Enclosure - A total enclosure which is cons-

tructed to restrict the rate of breathing in normal use.
2.4.2 Unrestricted Breathing Enclosure - A total enclosure not designed to
comply with the requirements for restricted breathing.

2.5 Non-sparaking Device - A device which is constructed to eliminate

the risk of occurrence of arcs, sparks and hot spots in normal use.
NOTE - Normal use excludes the removal or insertion of components with the cir_
cuit energized.

2.6 Enclosed Break Lampholder - A lampholder in which, when the

lamp is inserted or removed, electrical contact is made and broken, not
at the lamp cap but in a separate enclosure which forms an extension of
the space in which a lamp is secured in position and which is constructed
to prevent ignition of the surrounding flammable atmosphere.

2.7 Ignition Temperature - It shall be as defined in IS : 7820-1975*.

3. GENERAL AND CONSTRUCTIOJVAL REQUIREMENTS

3.1 General
3.1.1 A complete fitting may comprise a restricted breathing enclosure,
an unrestricted breathing enclosure, or a combination of both. The
lamp shall be totally enclosed.
--- I j’!
*Method oi test for ignition temperatures.
.
--A-B -
4
 IS : 8224 - 1976

3.1.2 The requirements relate to complete fittings for use in atmosphere

where the self/auto ignition temperature is not below 200°C.
NOTE - Fittings complying with this standard are not suitable for gases or vapours
having ignition temperature ,below 200°C ( set Appendix A ).

3.1.3 Fittings shall comply with the requirements specified in

IS : 1913-1969* except where otherwise stated.
3.1.4 A lampholder in an unrestricted breathing enclosure shall be of
the enclosed break type. Where a non-sparking lampholder is used, it
shall be housed in a restricted breathing enclosure.
NOTE - Enclosed break type lampholder may be used in either of the VYO.

3.1.5 Luminaires having restricted breathing enclosure, provision shall

be made for the attachment of protective guard.
NOTE - The requirements for protective guards shall be similar to those specified in
IS : 2206 ( Part I )-1962t and IS : 2206 ( Part II )-1976f.
3.1.6 Where a non-sparking lampholder is used, it shall be housed in a
restricted breathing enclosure; in such cases provision shall be made for
the attachment of reflectors and protective guards.
3.1.7 All materials shall be suitable for the operating conditions, with
particular attention being given to any thermoplastic materials. Non-
metallic materials, shall be flame retardant.
3.1.8 Care should be exercised in selection of materials for use in
chemically contaminated atmosphere to ensure that the material is
suitable for use in the particular atmosphere.
3.2 Clearances - The clearance shall be as stated in Table 1.
3.2.1 For luminaires with rated voltages less than 250 V, the voltage
to be taken intd consideration for the calculation of the clearances and
creepages between live parts and earth, shall be the line voltage, even
when the supply neutral is directly connected to earth.
3.3 Creepage Distances - The required lengths of creepage paths are
dependent on the tracking resistance of the insulating material and on
the shape of the surface of the insulating parts. The grading of
materials by comparative tracking index ( see IS : 2824-19645 ) is given in
Table 2. The grading given in this table applies to insulating parts
without ribs or notches on the surface. Where the insulating parts are

*Specification for general and safety requirements for electric lighting fittings (first
revision ) .
tSpecification for flameproof electric lighting fittings: Part I Well-glass. and bulkhead
types.
fspecification for flameproof electric lighting fittings: Part II Fittings using glass
tubes.
$Method for determination of the comparative tracking’bdex of solid instiMing
materials.
5 .
-4.. -
IS : 8224 - 1976

provided with ribs or notches in accordance with 3.3.4 the minimum

permissible creepage distances are to be based on those for insulating
materials of one grade higher.

3.3.1 The minimum values of the creepage distances shall be as stated

in Table 1.

TABLE 1 MINIMUM CREEPAGE DISTANCES AND CLEARANCES

AS TO THE GRADING OF INSULATING MATERIALS

( Clauses 3.2,3.3.1, 3.3.4 and 3.3.7 )

RATED VOLTAGE FOR MINIMUM CREEPAGE DISTANCE BOR MINIMWM

THE INSULATIONOF THE GRADE OF INSULATING MATERIAL CLEARANCE
THE EQUIPMENT* r __-._ --_-h___--__
a b ,c d

(1) (2) (3) (4) (5) (6)

V mm mm mm mm mm
60 6 6 6 6 6
250 6 8 10 12 6

*The rated voltages of the apparatus may exceed the values stated in the table by
10 percent. The working voltage ( of the system ) may exceed the rated voltage of the
apparatus by an additional 6 percknt.

3.3.2 The provisions given in 3.2.1 are also valid for creepage
distance.
3.3.3 In the measurement of creepage distance and clearances, joints
in composite bodies shall, in general, be regarded as creepage distances
even when they are stuck together or filled up.

3.3.4 Ribs or notches in the surface of insulated parts may only be

taken into consideration as part of the values required by Table 1 if the
ribs or notches are at least 3 mm high or deep and 3 mm broad.

3.3.5 Figure 1 shall be considered when dimensioning the creepage

distances. Figure 1 J is valid only when the component parts of the in-
sulating pieces are tightly inserted with a suitable bonding agent so that
the creepage distance run exclusively over the exterior surface.

3.3.6 The length of joints not sealed shall not be included when
,calculating the creepage distance unless all the parts between which they
run consist of ceramic insulating materials.

3.3.7 If creepage distances are interrupted by metal parts either one

partial path shall be equal to the minimum distance required or the sum
of the partial paths shall be 1.25 times thgf‘tralue given in Table 1.
 IS : 8224 - 1976

TABLE 2 GRADING OF PARTS MADE OF INSULATING MATERIALS

( Clause 3.3 )

GRADE COMPARATIVE REMARKS

TRACKINO
INDEX

(1) (2) (3)

a - Applies only to ceramic material.
No test of tracking resistance
required
b 500 More than 50 drops
C 380 More than 50 drops
d 175 More than 50 drops

3.4 Constructional Requirements

3.4.1 Restricted Breathing Enclosures - The restricted breathing enclosure

shall be such that it meets the requirements of the test given in 9.6.
3.4.2 Mechanical Strength Requirements - Fittings and parts of fittings,
including light transmitting parts, which may be subject to mechanical
damage in use, shall be capable of"qualifying in the mechanical strength
test given in 7.2 of IS : 6381-1972*.

3.4.3 Terminals - Terminals including earthing terminals shall not be

used for any purpose other than cable terminations.

3.4.4 Cable Entry, Suspension and Mounting

3.4.4.1 Cable entries -.Unless otherwise agreed, fittings. shall be

suitable for either 19 or 25 mm conduit or gland entry.

Gaskets and/or special components necessary to ensure that a

restricted breathing fitting complies with the restricted breathing require-
ments specified in 9.6 shall be supplied with the fitting.

Where entry to an unrestricted enclosure is by clearance hole, the

threaded portion of the entry device shall be secured by a 6 mm thick
nut on each side of the enclosure, or by equivalent means appropriate to
the conduit.

3.4.4.2 Suspension and mounting - Pendant fittings shall be capable of

being suspended either by conduit or chain or other suitable means.

If of the restricted breathing type, the suspension point shall be so

designed that the fitting can pass the test prescribed in 9.6 whether or
not it is mounted, and any gaskets and/or special components necessary
for this purpose shall be supplied with the fitting.

*Specification for construction and testing of electr$l apparatus with type of

protection ‘ c .
7
l
-4.. h
lS:8224-1976

’ E

I J
f = Crcepage distance, M = Metal, I = Insulation material
All dimensions in millimetres.
FIG. 1 DETERMINATIONOF CREEPAGEDISTANCES

3.5 Supply Cable Terminations and Connection

3.5.1 For the connection of the supply and ‘earth’ wiring the cable
terminal shdl! be one of the following types:
a> Nonyrotatable stud terminals not less than 4 mm. Each stud shall
be complete with an effective arrangement of nuts and washers to
ensure continuous and positive contact..
b) Clamp-type terminals with conducto$%ecured between pressure
plates under screw pressure.
8 .
--a7 s
 IS : 8224 - 1976

3.6 Internal Wiring

3.6.1 All terminations shall be such that they do not, in normal
operation, produce an arc or spark.

3.6.2 Connections to current carrying parts shall be such that the

contact is not impaired by temperatures or by vibrations which occur in
normal service or by shrinkage of insulating materials.

3.6.3 All internal wiring shall comply with the appropriate Indian
Standards where applicable, and be such as to withstand the service
temperatures without deterioration. The insulation of the wiring shall
be capable of operating at a continuous temperature of not less
than 100°C.

3.6.4 The cross-sectional area of single stranded conductors shall be

not less than 0.5 mm2.
3.6.5 Where conductors are inserted into ferrules, or are intended for
use with screwless receptacles, the ferrules or terminations shall be
soldered or crimped on the conductor.
3.6.6 The method of connecting shall be one of the following:
a) Terminals as described in 3.5;
b) Pinch screw terminals ( these are only permitted if the conductors
are soldered or crimped in ferrules );
c) Screwless type terminals (conforming to IS : 6585-1972” ); and
d) Soldering provided that the conductors to be connected are
joined together by mechanical means.

3.6.7 Where a screw type lampholder is used, the central contact of

the lampholder shall be connected to the line.

4. AUXILIARY GEAR AND FUSES

4.1 Discharge lamp auxiliary gear shall comply with IS : 1534 ( Part I )-
1967?, IS : 1569-1976: and IS : 3324-1965s or other relevant Indian
Standards.

4.2 Fuses, where fitted, shall be of the cartridge non-indicating type

Trnpiyi;” with IS : 2208-196211 mounted in a non-sparking holder
see . .

*Screwless terminal and electrical connections for lighting fittings.

tSpecification for ballasts for fluorescent lamps: Part I For switch start circuits (first
revision ) .
SSpecification for capacitors for use in tubular fluorescent, high pressure mer+ry and
low pressure sodium vapour discharge lamp circuits (first reu~eion ).
@Specification for starters for tubular fluorescent lampsg !
[ISpecification for HRC cartridge fuse-links up to 650 V.
IS : 8224 - 1976

4.3 Where starter switches are used they shall be of the hermetically
sealed type complying with IS : 2215-1968*.

4.4 Starter switch holders shall be of a non-sparking type ( see 2.5 ) and
both starter and holder shall be mounted within the enclosure.

5. LAMPHOLDER

5.1 All lampholders shall have terminals complying with the requirements
specified in 3.6 and shall comply with IS : 3323-19657 or IS : 1258-
1967$ or other relevant Indian Standards in respect of electrical safety
and interchangeability.

5.2 Non-sparking Lampholders - Lampholders shall be so construct-

ed as to minimize the risk of the occurrence of arc, spark or hot spots
capable of creating an ignition hazard during normal use. (Normal
use does not include the removal and insertion of lamps with their
circuits energized. )

Bayonet lampholders shall incorporate hue-piece plungers so designed

that the springs are not the means of carrying the current. In addition,
the connecting wires and insulation shall not be damaged when the lamp
is inserted or removed.

Screw lampholders shall incorporate a retaining or locking device

to prevent the lamp becoming loose in the holder under conditions
of temperature change or vibration.

&-pin lampholders shall be SO designed as to make and maintain

contact on the barrels of the lamp pins.
NOTE - Where vibration is severe it may be expected that special mounting will be
provided for the fitting.

5.3 Enclosed Break Lampholder - In addition to the requirements

specified in 5.2, the lampholder shall be SO constructed that, when the
lamp is inserted or removed, the electrical contact is made and broken,
not at the lamp-cap but in an enclosure designed to prevent ignition of
surrounding flammable atmosphere.

Each lampholder shall be marked with its nominal rated current.

NOTE - Thermosetting plastics may only be permitted if they are arc resistant
and self-extinguishing type and expansion and construction of the material does not
affect the safe operation of the lampholder.

*Specification for startem for fluorescent lamps ( second revision ).

tSpecification for Bi-pin lampholders for tubular fluoreqeent lamps.
$Specification for bayonet lampholder’s (first rtvisian.)i ’

10
 IS I 8224 - 1976

6. WARNING INSCRIPTION

6.1 Lighting rittings shall carry an inscription warning against opening

the enclosure unless circuit is isolated elsewhere or the fitting shall be so
designed that access to the lamp inside cannot be obtained unless
the circuit is rendered dead.

7. SURFACE TEMPERATURE-RISE

7.1 In general, the design and construction of the fitting shall be such
that in normal conditions of use, the maximum temperature of any part
of the external surface of a restricted breathing fitting does not exceed
200°C. For an unrestricted breathing fitting, the maximum temperature
of any part of any internal or external surface of the fitting or of the
external surface of the lamp shall not exceed ‘200°C.

7.2 For fittings for use in areas where gases or vapours having ignition
temperatures below 200°C may occur, attention is drawn to Appendix A.

8. MARKING

6.1 The following information shall be distinctly and durably marked on

all lighting fittings in a position where it can be easily seen during
maintenance:
a) The number of this standard, and the words ‘Division 2’;
b) The mark of origjn ( this may take the form of a trade-mark, the
manufacturer’s identification mark, the name of the responsible
vendor );
c) The maximum wattage and voltage as appropriate and type of
the lamp permitted for use in the fitting;
d) Ignition group(s) of gases for which the fitting is suitable;
e) The words ‘Kestricted Breathing’ in case of restricted breathing
fittings or compartments, as applicable; and
f) The name or symbol of the testing station and the number of the
test certificate and approval number.

Where necessary, to ensure proper use and maintenance, the

following additional marking should be added:
g) The voltage range and frequency appropriate to the discharge
lamp auxiliary gear together with a wiring diagram. This
marking may be on the auxiliary gear. j’,
IS : a224 - 1976

8.2 BIS Certification Marking

The product may also be marked with Standard Mark.

8.2.1;The use of the Standard Mark is governed by the provision of

Bureau of Indian Standards Act, 1986 and the Rules and Regulations made
thereunder. The details of conditions under which the licence for the tise of
Standard Mark may be granted to manufacturers or producers may be obtained
from the Bureau of Indian Standards.

9. TESTS

9.0 General Conditions of Tests - The tests shall be made on a

representative fitting in new condition which shall pass all the tests
applicable to it and also satisfy those requirements which can be checked
only by inspection.

9.0.1 The tests shall be made at 27 f 5°C unless other temperature is

specified.

9.1 Classification of Tests

9.1.1 Type Tests - The following shall constitute type tests:

a> Insulation resistance ( dry ) test ( see 9.2 ),

b) High voltage test ( see 9.3 ),
c> Insulation resistance ( humid > test ( see 9.4 ),
d) Test for mechanical strength ( see 9.5 ),
e) Test for restricted breathing enclosure ( see 9.6 ),
f> Test for suspension ( see 9.7 ),
g> Test for enclosed break lampholder ( see 9.8 ), and
h) Test for temperature rise ( see 9.9 ).

9.1.2 The following shall constitute acceptance tests:

4 Insulation resistance ( dry ) test ( see 9.2 ),

b) High voltage test ( see 9.3 ), and
4 Test for restricted breathing enclosure ( see 9.6 ).

9.1.2.1 Five fittings shall be taken at random for acceptance from

each batch of not more than 100 fittings as a first stage sample. If all
the fittings pass the tests, the batch shall be deemed to comply with the
requirements of this standard. j’t

12
.
--a-. -
 IS : 8224 - 1976

If any one of the fittings taken in the first stage fails, anothor set of
five fittings shall be taken as a second stage sample and tested. If there
is no failure in the second stage testing, the batch shall be deemed to
comply with the requirements of this standard otherwise not.

9.1.3 The following shall constitute routine tests:

a) Insulation resistance ( dry ) test ( see 9.2 ), and
b) High voltage test ( see 9.3 ).

9.2 Insulation Resistance ( Dry ) Test - The provisions of 11.2 of

IS : 1913-1969* shall apply.
9.3 High Voltage Test - The provisions of 11.3 of IS : 1913-1969*
shall apply.
$4 Insulation Resistance ( Humid ) Test - The provisions of 11.4
of IS : 1913-1969* shall apply.

9.5 Test for Mechanical Strength - The provisions of 11.8 of

IS : 1913-1969* shall apply.
9.6 Test for Restricted Breathing Enclosure - Under constant
temperature conditions the time interval required for an internal pressure
of approximately 3 000 N/ma ( 300 mm Hz0 gauge ) below atmospheric
to change to approximately 1 500 N/m2 ( 150 mm Hz0 gauge ) below
atmospheric shall not be less than 30 seconds.

9.7 Test for Suspension

9.7.1 Test for Suspension of All Pendant Fittings - A constant static load
equal to four times the weight of the fitting shall be applied to the
fitting in the normal direction of loading for a period of 1 hour. There
shall be no appreciable deformation at the end of this period.

9.7.2 Test for Multi-Suspension Pmdant Fittings - The fitting shall be

disconnected at that point of attachment which is most likely to cause
failure, and released suddenly. The remaining suspension or suspensions
shall support the fitting for 1 hour.

9.8 Test for Enclosed Break Lampholder - The lampholder shall

be filled with and surrounded in the atmosphere of air-hydrogen mixture
consisting of 28 percent hydrogen.

A current, twice the maximum value, ,for which it is designed shall

be broken by operation of the contacts in the internal enclosure of the
lampholder, The test shall be repeated 20 times with a fresh gas-mixture
every time and the lampholder shall be deemed to satisfy the require-
ment, if it remains undamaged, and external ignition and excessive
burning ‘of the contacts have not occurred. 4’ ’

*Specification for general and safety requirements for electric lighting fittingL(&;t _
revision ).
13
IS : 8224 - 1976

9.9 Test for Temperature-Rise

9.9.1 The test shall be made in accordance with 11.7 of IS: 1913-1969*.
The maximum permissible temperature shall be in accordance with 7.1
except that where a lower temperature is specified in IS : 1913-1969*,
that temperature shall be deemed to be the maximum permitted
temperature.
9.9.2 The test shall be applied to a complete fitting of normal design
and construction. If the fitting is designed to include an external
reflector, the maximum surface temperature shall comply with the
requirements both with and without the reflector.

APPENDIX A
( Clauses 3.1.2 and 7.2 )
LIST OF GASES AND VAPOURS KNOWN TO HAVE
SELF/AUTO IGNITION TEMPERATURE BELOW 200°C

A-l. The following gases and vapours are known to have self/auto
ignition temperature below 200°C:

Ethyl nitrite, isopropyl nitrate, carbon disulphide, acetaldehyde,

diethyl ether, dipropyl ether, dibutyl ether, diamyl ether, dihexyl
ether, ethyl methyl ether, diethyl peroxide, benzaldehyde, and trime-
thylamine.
A-2. There are also a few gases and vapour whose seif/auto ignition
temperature have not been measured but may be below 200°C. In case
of doubt, reference should be made to the appropriate testing authority.
NOTE - Fittings complying with this standard are not necessarily suitable for gases
or vapours having self/auto ignition temperatures below 200°C; special precautions
are necessary for such hazards and should be agreed between the user and the approv-
ing and resting authority.

*Specification for general and safety requiremen&‘!for electric lighting fittings (fir31
m&ion ).
.
-c-7.
14
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Plot No. 43, Sector 16 A, Mathura Road, FARIDABAD 121001 8-20 08 01
Savftri Complex, 116 G.T. Road, GHAZIABAD 201001 0-71 1996
53/5 Ward No.29, R.G. Barua Road, 5th By-lane, GUWAHATI 781003 541137
5-8-56C L.N. Gupta Marg, Nampatfy Station Road, HYDERABAD 5oOOOt 201003
E-52, Chitaranjan Marg. C-Scheme, JAIPUR 302001 37 29 25
117/418 B, Sarvodaya Nagar, KANPUR 206005 21 68 76

Seth Bhawan, 2nd Floor. Behind Leeb Cinema, Naval Kishore Road, 23 8923
LUCKNOW 226001

NIT Building. .Second Floor, Gokulpat Market. NAGPUR 440010 52 51 71

Pattiputra Industrial Estate, PATNA 800013 26 23 05
Institution of Engineers (India) Building 1332 Shivaji Nagar, PUNE 411005 32 36 35
T.C. No. 14/l 421, University P. 0. Patayam, THIRUVA NANTH4PUFiAM 695034 621 17

*Sales Cffiie is at 5 Chowringhee Approach, P.O. Princep Street, 271085

CALCUTTA 700072
tSales Cffice is at Novelty Chambers, Grant Road, MUMBAI 400007 309 65 28
&Sales Cffice is at ‘F’ Block, Unity Building,’ Narashimaraja Square, 222 39 71
BANGALORE 560002

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