( Reaffirmed 2005 )

fS t 10322 ( Part 4 ) - 1984

Indian Standard
SPECIFICATION FOR LUMINA I RES
PART 4 METHODS OF TESTS

Illuminating Engineering and Luminaires Sectional Committee,

ETDC 45

Chairman Representing
SHRI G. K. KHEMANI Central Public Works Department, New Delhi
Members

SURVEYOR OB WORKS ( ELEOTRICAL )-III ( Alternate to

Shri G. K. Khemani )
SHRI G. K. AITHAL Baiai Electricals Ltd, Bombay
SHRI JAQDISH SHARAN ( Alternate ) ” ”
SHRI P. K. BANDYOPADHYAY Peico Electronics & Electricals Ltd, Bombay
SHRI P. K. SANPAL ( Alternate )
SHRI G. BHATTACHARYA National Test House, Calcutta
SERI P. C. PRADHAN (Alternote )
SHRI N. S. CHAR1 Crompton Greaves Ltd, Bombay
SARI V. R. MAJUMDAR ( Alternate )
SHRI N. S. CHARI Association of Indian Engineering Industry,
New Delhi
SHRI A. MUKHERJEE ( Alternate )
SHRI H. N. GUPTA Directorate General Factory Advice Services &
Labour Institute ( Ministry of Labour ),
Bombay
SHRI V. S. SASIEUMAR ( Alternafe )
JOINT DIRECTOR STANDARDS Railway Board ( Ministry of Railways )
( ELECT ) TLM, RDSO
DEPUTY DIRECTOI~STANDARDS,
TLM ( Alternate )
SHRI R. V. NARYANAN Directorate. General of Supplies & Disposals,
New Delhi
SHRI ANIL GUPTA ( Alternate )
SHRI V. H. NAVKAL The Bombay Eledtric Supply & Transport Under-
taking, Bombay
&RI S. H. MILLAR ( Alternate )
SHRI U. S. NIQAM Central Mining Research Station ( CSIR ),
Dhanbad
1 SHRI M. R. PAUL ( Alternate )
( Continued on page 2 )

Q Copyright 1985
INDIAN STANDARDS INSTITUTION
This publication is protected under the Zndicin Copyright Act ( XIV of 1957 ) arid
reproduction in whole or in part by any means except with written permissionof the
publisher shall be deemed to be an infringement of copyright under the said Act.
IS : 10322 (Part 4) - 1984

( Continued from page 1 )

Members Representing
SHRI S. B. NEYOQI Directorate of Technical Development and
Production ( Air ), New Delhi
SHRI J. K. GROSH ( Alternale )
SHRI J. R. PARI The General Electric Co of India Ltd, Calcutta
SHRI S. K. NEO~I (Alternate )
LT-COL B. B. RAJPAL Engineer-in-Chief’s Branch, Army Headquarters,
New Delhi
SHRI R. S. KANWAR ( Alternate )
SHRI K. S. SARMA National Physical Laboratory ( CSIR ), New
Delhi
SHR~ K. P. SEANBHO~UE National Industrial Development Corporation
Ltd, New Delhi
SHRI G. S. SRIVASTAVA Metallurgical Engineering 82 Consultants,
Ranchi
SHRI H. S. SAINI ( Alternate )
SHRI H. SINIIA Illu;in&Fag Engineering Society of India,
a
SHRI K. K. ROHAT~I ( Alternate )
SHRI V. K. Soon The Mysore Lamp Works Ltd, Bangalore
SHRI SURESH DHINQRA ( Alternate )
SHRI P. N. SRINIVASAN PNS Lighting Design & Consultancy, Bangalore
SHRI G. N. THADANI Engineers India Ltd, New Delhi
SHRI S. K. GHOBH ( Alternote )
SHRI S. P. SACHDEV, Director General, IS1 ( Ex-oficio Member j
Director ( Elec tech )
.
Secretary
SHRI SUEH BIR SIN~H
Deputy Director ( Elec tech ), IS1

Panel For Preparing Standards For Luminaire in Multipart,

ETDC 45 : Pll
COnoBner
SHRI P. K. BANDYOPADHYAY Peico Electronics & Electricals Ltd, Bombay
Members
SHRI P. K. SANYAL (Alternate to
Shri P. K. Bandyopadhyay )
SARI N. S. CHARI Crompton Greaves Ltd, Bombay
CEIEB ENQINEEX ( ELEO )-II Central Public Works Department, New Delhi
SURVEYOR OB WORES ( E )-III (Alternate)
SHRI V. H. NAVKAL ’ ’ The Bombay Electric Supply & Transport
Undertaking, Bombay
SHRI S. H. MILLER (Alternate )
SHRI J. R. PARI Genelec Limited, Bombay
SHRI K. S. SARXA National Physical Laboratory (CSRI ),
New Delhi
SHRI P. N, SRINIVASAN PNS Lighting Design and Consultancy,
Bangalore

2
 IS:10322 (Part 4 )- 1984

Indian,Standard
SPECIFICATION FOR LUMINAIRES
PART 4 METHODS OF TESTS

0. FOREWORD

0.1 This Indian Standard was adopted by the Indian Standards Institution
on 8 August 1984, after the draft finalized by the Illuminating Engineer-
ing and Luminaires Sectional Committee had been approved by the
Electrotechnical Division Council.
0.2 This standard ( Part 4 ) is one of the series of Indian Standards which
deals with luminaires. This series consists of the following parts:
Part 1 General requirements,
Part 2 Constructional requirements,
Part 3 Screw and screwless terminals,
Part 4 Methods of tests, and
Part 5 Particular requirements.
0.3 In general, Parts 1, 2, 3 and 4 of this standatd cover safety
requirements for luminaires. The object of these parts is to provide a set
of requirements and tests which are considered to be generally applicable
to most types of luminaires and which can be called up as required by the
detail sepeifications under Part 5. Parts 1, 2, 3 and 4 are thus not to be
regarded as a specification by itself for any type of luminaire, and its
provisions apply only to particular type of luminaires to the extent
determined by the appropriate section of Part 5.
0.4 The sections of Part 5 in making reference to any other parts of the
standard, specify the extent to which that section is applicable and the
order in which the tests are to be performed; they also include additional
requirements as necessary. The order in which the clauses in Parts 1, 2, 3
and 4 are numbered, therefore, has no particular significance as the order
in which their provisions apply is determined for each type of luminaire
or group of ,luminaires by the appropriate section of the Parts 5. All
sections of Part 5 are self-contained and therefore do not contain reference
to other sections of Part 5.
0.5 A luminaire shall comply with a section of Part 5. If, however, an
appropriate section of Part 5 does not exist for a particular luminaire or

3
IS t 10322 (Part 4 ) - 1984

group of luminaires, the nearest applicable section of Part 5 may be used

as a guide to the requirements and tests.
0.6 This standard is intended to establish essential requirements of general
nature and minimum standard for design and construction of lighting
fittings in order to ensure their safe performance, good construction and
high class of workmanship. This standard, therefore, along with other
appropriate parts of this standard, will ultimately replace IS : 1913
( Part 1 )-1978*.
0.7 In the preparation of this standard assistance has been derived from
IEC Publication: 598-l ( 1979 ): ‘ Luminaires Part 1 General requirements
an”d tests ’ , published by International Electrotechnical Commission.
0.8 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 - 196Ot.
“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 ( Part 4 ) covers the methods of tests applicable to
luminaires for use with tungsten filament, tubular fluorescent and other
discharge lamps on supply voltage not exceeding 1 000 V.
2. RESISTANCE TO DUST AND MOISTURE
2.1 Tests for Ingress of Dust and Moisture - The enclosure of dust-
proof, dust-tight, drip-proof, rain-proof, splash-proof, jet-proof, watertight
and pressure watertight luminaires shall provide the degree of protection
against dust or moisture in accordance with the classification of the
luminaire.
Compliance shall be checked by the appropriate tests specified
in 2.1.1 to 2.1.8.
Before the tests of 2.1.3 to 2.1.8 the luminaire complete with lamp(s)
shall be switched on and brought to a stable operating temperature at
rated voltage.
The water for the tests, specified in 2.1.3 to 2.1.8 shall be at a
temperature of 15 f 10%.
After completion of the tests, the luminaire shall withstand the
electric strength test, as specified in 3 and inspection shall show:
*Specification for genera1 and safety requirements for luminaires: Part I Tubular
flubrescent lamps ( second reuih ).
iRules for rounding off numerical values ( revised ).

4
 IS: 10322( Part 4 ) -1984

a) No deposit of talcum powder in dust-proof luminaires, such that

if the power were conductive, the insulation would fail to meet
the requirements of this standard.
b) No deposit of talcum powder inside enclosure for dust-tight
luminaires.
c) No trace of water on live parts or on insulation where it could
become a hazard for the user or surroundings, for example where
it could reduce the creepage distances below the values specified
in 4.
d) No accumulation of water in drip-proof, rain-proof, splash-proof
and jet-proof luminaires or their protective glasses, such as
would impair safety.
e) No trace of water entered in any part of a watertight or pressure
watertight luminaire.
Fixed drip-proof, rain-proof, splash-proof and jet-proof luminaires
complete with their protective translucent covers, if any, shall be mounted
and wired as in normal use.
Portable luminaires, wired as in normal use, shall be placed in the
most unfavourable position of normal use.
Glands, if any, shall be tightened with a torque equal to two-thirds
of that applied to glands in the appropriate test specified in Part 2.
Fixing screws of covers, other than hand-operated fixing screws of
glass covers, shall be tightened with a torque equal to two-thirds of that
specified in Table 1 of Part 2.
Screwed lids shall be tightened with a torque having a value in
newton metres numerically equal to one-tenth of the nominal diameter of
the screw thread in millimetres. Screws fixing other caps shall be tightened
with a torque equal to two-thirds of that specified in Table 1 of Pax t 2.
2.1.1 Test - Dust-proof luminaires ( first characteristic IP numeral 5 )
shall be tested in a dust chamber sinGJar to that shown in Fig. 1 in which
talcum powder is maintained in suspension by an air current. The chamber
shall contain 2 kg of powder for every cubic metre of its volume. The
talcum powder used shall pass through a square-meshed sieve whose
nominal wire diameter is 50 pm and whose nominal free distance between
wires is 75 pm and shall have a range of particle size down to and
including 1 pm with at least 50 percent by weight iess than 5 pm. It
should not have been used for more than 20 tests.

The luminaire shall be hung inside the chamber, brought up to

operating temperature, switched off and left for 2.5 hours. The luminaire

5
!S a iO322( Pat 4) - 1984

GLASS WINDOW

EQUIPMENT UNDER
TEST

Fro. 1 APPARATUS FOR PROVINQ PROTECTION AGAINST DUST

is then switched on and operated under normal operating conditions for
3 hours at. the conclusion of which period it is switched off and left for a
further period of 2.5 hours. The total testing time is thus 8 hours.

2.1.2 Tc.sd - Dust-tight luminaires ( first characteristic IP numeral 6 )

shall be tested in accordance with 2.1.1.

2.1.3 Test - Dirp-proof luminaires (second characteristic IP numeral 1)

shall be subjected for 10 minutes to an artificial rainfall of 3 mm/min,
falling vertically from a height of 200 mm above the top of the luminaire.

2.1.4 Test - Rain-proof luminaires (second characteristic IP numeral 3)

shall be sprayed with water for 10 minutes by means of a spray appara-
tus as shown in Fig. 2. The radius of the semi-circular tube shall be as small
as possible and compatible with the size and position of the luminaire. The
tube shall be perforated so that jets of water are directed towards the
centre of the circle and the water pressure at the inlet of the apparatus
shall be approximately 80 kN/ms.

6
c

IS : 10322( Pa+ 4 ) I 1984

MINIMUM INTERNAL DIAMETER 15mm

0.1. ,mnm DIAMTTCI? HOLES

R : 100 mm CR MULTIPLES THEREOF

LUIUINAIREPROTECTION

Rain-proof Splash-proof
___-

Oscillation half-angle f 60” + 180”

Holes within half-angle & 60” f 90”

FIG. 2 APPARATUS FOR TESTING PROTECTION AGAINST

RAIN AND SPLASHING
The tube shall be caused to oscillate through an angle of 120°, 60”
on either side of the vertical, the time for one complete oscillation
( 2 x 120” ) being about 4 seconds.
The luminaire shall be mounted above the pivot line of the tube so
that the ends of the luminaire receive adequate coverage from the jets.
The luminaire shall be turned about its vertical axis during the test at a
rate of 1 rev/min.
After lo-minute period, the luminaire shall be switched off and
allowed to cool naturally whilst the water spray is continued for a further
10 minutes.
2.1.5 Test - Splash-proof luminaires ( second characteristic IP nume-
ral 4 ) shall be sprayed from every direction with water for 10 minutes by
means of the spray apparatus shown in Fig. 2 and described in 2.1.4. The

7
 --..--.-..-..~._._-__._.
__.__
_ ,___
I----

IS t 10322( Part 4 ) - 1984

luminaire shall be mounted under the pivot line of the tube so that the
turned ends of the luminaire receive adequate coverage from the jets.
The tube shall be caused to oscillate through an angle of almost
360”, 180” on either side of the vertical, the time for one complete
oscillation ( 2 x 360” ) being about 8 seconds. The huninaire shall be
about its vertical axis during the test at a rate of 1 rev/min.
The support for the equipment under test shall be grid-shaped in
order to avoid acting as a baffle. After lo-minute period, the luminaire
shall be switched off and allowed to cool naturally whilst the water spray IS
continued for a further 10 minutes.
2.1.6 Test - Jet-proof luminaires ( second characteristic IP numeral 5 )
shall be switched off and immediately subjected to a water jet for
15 minutes from all directions by means of a hose having a nozzle with the
shape and dimensions shown in Fig. 3. The nozzle shall be held 3 m from
the sample.
The water pressure at the nozzle shall be approximately 30 kN/m?

DETAIL OF NOZZLE

PRESSURE GAUGE

All dimensions in millimetres.

FIG. 3 NOZZLE FORSPRAYTEST
P.1.7 Test - Watertight luminaires ( second characteristic IP numeral
7 ) shall be completely immersed for 30 minutes in water, so that there is

8
 IS : 10322 ( Part 4 ) - 1984

at least 150 mm of water above the top of the Iuminaire and the lotiest
portion is subjected to at least 1 m head of water.

NOTE - This treatment is not sufficiently severe for luminaires intended far
operation under water.

2.1.8 Test - Pressure watertight luminaires ( second characteristic IP

numeral 8 ) shall be heated, either by switching on the lamp or by other
suitable means, so that the temperature of the luminaire enclosure exceeds
that of the water in the test tank be between 5 and 10%.
The luminaire shall then be switched off and subjected to a water
pressure of 1.3 times that pressure which corresponds to the rated maxi-
mum immersion depth for a period of 30 minutes.
2.2 Humidity Test - All luminaires shall be proof against humid condi-
tions which may occur in normal use.
Compliance shall be checked by the humidity treatment described
in 2.2.1, followed immediately by the tests of 3.
Cable entries, if any, shall be left open; if knock-outs are provided,
one of them shall be opened.
Electrical components, covers, protective glasses and other parts
which can be removed by hand shall be removed and subjected, if
necessary, to the humidity treatment with the main part.
2.2.1 Test- The luminaire shall be placed in the most unfavourable
position in normal use, in a humidity cabinet containing air with a relative
humidity maintained between 91 and 95 percent. The temperature of
the air at all places where samples can be located shall be maintained
within 1°C of any convenient value t between 20 and 30°C.
Before being placed in the humidity cabinet, the sample shall be
brought to a temperature between t and ( t + 4 )“C.
The sample shall be kept in the cabinet for 48 hours.
NOTE - In most cases, the sample may be brought to the specified temperature
between t and ( t + 4 )“C by keeping it in a room at this temperature for at least
4 hours before the humidity treatment.
In order to achieve the specified conditions within the cabinet, it is
necessary to ensure constant circulation of the air within, and in general,
to use a cabinet which is thermally insulated.
After this treatment, the sample shall show no damage affecting
compliance with the requirements of this standard.
3. INSULATION RESISTANCE AND ELECTRIC STRENGTH
3.1 The insulation resistance and the electric strength of luminaires shall
be adequate.

9
fS : 10322 ( Part 4 ) - 1984

3.1.1 Compliance shall be checked by the tests of 3.2 and 3.3 in the
humidity cabinet or the room in which the sample was brought to the
prescribed temperature, after reassembly of those parts which may have
been removed.
3.1.2 The switch, if any, shall be placed in the ON position for all tests,
except for tests between live parts which are separated by the action of a
switch.
3.1.3 Shunt connected capacitors and capacitors between live parts and
the body shall be disconnected during these tests as shall any choke or
transformer connected between live parts.
3.1.4 If it is impossible to place metal foil in position on linings or
barriers, the tests shall be made on three pieces of the lining or barrier
which have been taken out and placed between two metal balls having a
diameter of 20 mm, which shall be pressed together with a force of 2 N.

3.2 Insulation Resistance Test

3.2.1 The insulation resistance shall be measured with a dc voltage of
approximately 500 V, 1 minute after the application of the voltage.
3.2.2 The insulation resistance shall not be less than the values specified
in Table 1.

TABLE 1 MINIMYM INSULATION RESISTANCE

IESIJLATION ’ MINIMUX INSULATJON
RESISTANCE ( MS )
7- -.-..V-*----,
Luminaires Class II ’
Other Than Luminaires
Class II
Between live parts of different polarity 2
Between live parts which can become of different 2
polarity through the action of a switch
Between live parts and the body* 2
Between accessible metal parts and metal foil on the 2
inside of insulating linings and barriers
Basic insulation of Class II luminaires
Supplementary insulation of Class II luminaires -
Bushings prescribed in Part 2 of this standard 2
Insulation of anchorages prescribed in Part 2 of 2
this standard
Insulation of wire carriers or clips prescribed in Part 2 2
of this standard
*The term ‘ body ’ includes accessible metal parts, accessible fixing screws and metal
foil in contact with accessible parts of insulating materials.

10
 IS : 10322 ( Part 4 ) - 1984

3.2.3 The insulation between live parts and the body of Class II lumi-
naires shall not be tested if the basic insulation and the supplementary
insulation can be tested separately.
3.2.4 Insulating linings and barriers shall be tested only if the distance
between live parts and accessible metal parts would be less than that pres-
cribed in Part 4 were the lining or barrier not there, or if the lining or
barrier is necessary to comply with the requirement of appropriate
clause in Part 2 of this standard,
3.2.5 For the tests on the insulation of bushings, cord grips, wire
carriers and clips, the cable or cord shall be covered by metal foil or
replaced by a metal rod of the same diameter.
3.2.6 These requirements do not apply to starting aids which are pur-
posely connected to the mains if they are not live parts.
NOTE - See Appendix A for a test for live parts.

3.3 Electric Strength Test

3.3.1 A voltage of substantially sine-wave form, having a frequency of
50 or 60 Hz and the value specified in Table 2, shall be applied for
1 minute across the insulation.
TABLE 2 ELECTRIC STRENGTH
( Clauses 3.3.1 and 3.3.4 )
INSULATION TEST VOLTAQE (V)
~---~*----_~
Other Than Class II
Class II Luminaires
Luminaires
Between live parts of different polarity 2u + 1 000 2U + 1000
Between live parts which can become of different 2u + 1000 2u + 1000
polarity through the action of a switch
Between live parts and the body* 2u + 1000 2u + 3500
Between accessible metal parts and metal foil on the 2u + 1000 2u + 3 500
inside of insulation linings and barriers
Basic insulation of Class II luminaires 2u + 1000
Supplementary insulation of Class II luminaires 2 500
Bushings prescribed in Part 2 of this standard 2u + 1000 2u + 3 500
Insulation of anchorage prescribed in Part 2 of this 2u + 1 000 2 500
standard
Insulation of wire carriers or clips prescribed in Part 2 2u + 1000 2 500
of this standard
U = Working voltage. Where the working voltage is 42 V or less, the test voltage
shall be 500 V instead of ( 2U + 1 000 V ).
*The term ‘ body ’ includes accessible metal parts, accessible fixing screws and metal
foil in contact with accessible parts of insulating material ( reinforced insulation of
class II luminaires ).
----_-

11
IS : 10322 ( Part 4 ) - 1984

3.3.2 Initially, no more than half the prescribed voltage shall be

applied, then it is raised gradually to the full value.
3.3.3 No flashover or breakdown shall occur during the test.
3.3.4 These requirements do not supply to starting aids which are
purposely connected to the mains if they are not live parts.
NOTE 1 -For Class II luminaires incorporating both reinforced insulation and
double insulation, care should be taken that the voltage applied to the reinforced
insulation does not stress the basic insulation or the supplementary insulation more
than they are stressed by the voltage specified in Table 2.

NOTE 2 - Glow discharges which do not cause a drop in voltage ( when

measured across the points of application ) should be neglected.

3.4 Measurement of Leakage Current

3.4.1 The luminaire shall be connected to a voltage equal to 1.1 times
rated supply voltage at rated frequency. The current measured between
each pole of the supply source and the metal body of the luminaire with
and without lamps, shall not exceed the following values:
All luminaires Class 0 and Class II 0.5 mA
Portable luminaires Class I 1-O mA
Fixed luminaires Class I 1-O mA
up to 1 kVA rated input, increasing
by 1 *O mA/kVA up to a maximum of 5.0 mA
The resistance of the measuring circuit shall be 2 000 f 50 C.
4. CREEPAGE DISTANCES AND CLEARANCES
4;l .Live parts and adjacent metal parts shall be adequately spaced.
Creepage distances and clearances shall not be less than those specified in
Table 3.
NOTE - The minimum requirements of Table 3 are for luminaires of Class 0
and Class I which are intended for use in conditions where the risk of contamination
due to condensation, dust or dirt is low. For use in other conditions where conta-
mination may occur due to the nature of the work or surroundings, extra care is
necessary in the protection of live parts and their insulation.

4.2 Test - Compliance shall be checked by measurement made with and

without conductors of the largest section connected to the terminals of the
luminaires.
The contribution to the creepage distance over the surface of any
groove less than 1 mm wide shall be ignored when measuring the total
surface path.
Any part of the sealing compound protruding beyond the end of the
cavity containing a live part shall be ignored in Item 6(b) of Table 3.

12
 IS : 10322 (, Paa% 4 ) - 19M

TABLE 3 CREEPAGE DISTANCES AND CLEARANCeS

( Clauses 4.1 and 4.2 )
CREEPAGE DISTANCES AND LUMINAIRES DIPCLASSES LUXINAIRES ox LUXI+
CLEARANCES IN MILLIYETR~S 0 AND I CLASS 11 NAIRES
BETWEEN _A---L-A_- __-_ FT-_*-_-7 >
~----,h----_.._~ ‘24 250 5001 I 000” ,24 250 500. ;‘. czas
Working voltage ( not W) (V) (V) (V) WI (V) 09~ III
exceeding )
‘, _
(1) (2) (3) (4) (5) (6) (7) (8) (3)
i) Live parts of different 2 3 4 6 - 2 3 4*;..2
polarity
ii) Live parts and accessible
metal parts, also between
live parts and the outer I
accessible surface of in-
sulating parts ( this may
be the outer surface of
the luminaire if of insula-
ting. material )
Creepage 2 4 5 6 2 8 10 2’ ,:
Clearance 2 3 5 6 2 8 10 2,
iii) Parts which may become - - 2 41 5 -
live due to the breakdown
of functional insulation
in luminaires of Class II
and accessible metal .r
parts

iv) The outer surface of a - - - 4 5 -

flexible cord ‘or cable and
accessible metal to which
it is secured by means of ,.I
a cord grip, cable carrier
Or clip of insulating
.
~
material

v) Live parts of switches 2 - -.

mounted in luminaires
and adjacent metal parts,
after the removal of the
insulating lining ( if any )
in the vicinity of the
switch

vi) Live parts and other

metal parts between :..
them and the supporting
surface ( ceiling, wall.,
table, etc ) or between
live parts and the suppor-
( Continued )

13
IS t 10322 ( Part 4 ) - 1984

TABLE 3 CREEPAGE DISTANCES AND CLEARANCES - Contd

CREHPAQE DISTANCES AND L~~~INA~;IX;I;CLAS~ES L~;M~;;oB LUruP

CLEARANCESIN MILLIMETRES NAIRES
BETWEEN T--h____~ c_-_*--.7
c--_.-- h--m- ‘7 24 250 500+ 1 COO* 24 250 500 CZSS
Working voltage ( not (V) (V) (V) (V) (V) (V) (V) III
exceeding )

(1) (2) (3) (4) (5) (6) (7) (8) (9)

ting surface where there
is no intervening metal:
a) with no covering over 2 6 8 10 2 8 10 2
the live part
b) through sealing cam- - 4 6 8 -6 8 -
pound with a thick-
ness of not less than
2’5 mm

*These values are working voltages and therefore they’d0 not conflict with the 250 V
limit for rated voltage of Class 0 luminaires.
NOTE 1 - Internal creepage distances in permanently sealed components are
not measured. Examples of permanently sealed components are components sealed-
off or compound filled.
NO’PE 2 - The value in the table do not apply to components for which separate
Indian Standards exist, but apply only to the mounting distances in the luminaire.
NOTE 3 - In the case of starting transients up to 5000 V peak, a 50 percent
increase in the values given in the table is applicable.
NOTE 4 - Supply cables not supplied with the luminaire are not tested.

5. MECHANICAL STRENGTH TEST

5.1 The luminaires shall be tested for the adequate mechanical strength
by the following method.

5.2 Tests - Blows shall be applied to the sample by means of the spring-
operated impact test apparatus shown in Fig. 4 or by other suitable means
giving equivalent results.
NOTE - Equivalent impact energies obtained by different methods do not
necessarily give the same test result.

5.2.1 The apparatus consists of three main parts, the body, the striking
element and the spring-loaded release cone,
5.2.2 The body comprises the housing, the striking element guide, the
release mechanism and all parts rigidly fixed thereto. The mass of the
assembly shall be I.25 kg.

14
 IS I 10322( Part 4 ) - 1984

RELEASE BAR RELEASE MECHANISM

r CONE SPRING SPRING
RELEASE JAW

/ -“““‘-“‘7’cLLLLyILLLLLLLyLLLLfLLy_uLyI I
&AMMER HEAD L HAMMER SPRING ‘COCKING KRDB
1 HAMMER SHAFT

Fro. 4 IMPACTTEST APPARATUS

5.2.3 The striking element comprises the hammer head, the hammer
shaft and the cocking knob. The mass of this assembly shall be O-25 kg.
5.2.4 The hammer head shall have a hemispherical face of polyamide
having a rockwell hardness of RlOO, with a radius of 10 mm; it shall be
fixed to the hammer shaft in such a way that the distance from its tip to
the plane of the front of the cone when the striking element is on the point
of release, is equal to the value shown for the compression in Table 4.
TABLE 4 IMPACT ENERGY AND SPRING COMPRESSION
( Clauses5.2.4 and 5.2.6 )
PART To BE TESTED IXP ACT COMPRESSION
ENER QY (mm)
(Nm)
(1) (2) (3)
Class I1 Luminaires
Translucent covers forying part of the prc&&on 0’35 17
->gamst aust vut not providing
____
Cpr4fectlonX@WStE%FCtlW~l%c~ _‘-” I. ..I.-
Tr~~~ucentcover;ijroviding-p;otection against 0’50 20
electric shock
Other parts 0’70 24
Other Lumit;aires
Translucent - covers
- _ -_forming part of the, protec- 0’20 13
<ion agamst dust a;i;rm-rjiSGG, 6K not provi-
Gig protection against electric shock, parts of
ceramic material and parts of ceramic lamp-
holders integral with the luminaire
Translucent covers providing protection against 0’35 17
electric shock and other parts, with the excep-
tion of parts of ceramic material
NOTE - Translucent covers, neither providing protection against electric shock
nor forming part of the protection against dust and bure, are not subjected to
the test.
S&a 10322 ( Part 4 )- 1984

5.2.5The cone shall have a mass of O-06kg and the cone spring shall
be such that it exerts a force of 20 N when the release jaws are on the
point of releasing the striking element.
5.2.6 The hamt-ner spring shall be such that the product of the com-
pF&sbon lin millimetres and the force exerted in newtons, equals 1 000, the
+mpression being approximately 20 mm. The spring shall be ad_justable
so ;‘as to cause the hammer to strike with an impact energy and spring
compression as shown in Table 4.
L 5:W .The release mechanism springs shall be adjusted so that they exert
just sufficient pressure to keep the release jaws in the engaged position.
5.2.8 The apparatus is cocked by pulling the cocking knob back until
t&e,release jaws engage with the groove inthe hammer shaft.
.,..’
“,5.2.9 The blows shall be applied by pushing the release cone against
the sample in a direction perpendicular to the surface at the point to be
tested.
5.2.10 The ‘pressure shall be slowly increased so that the cone moves
back until it is in contact with’ the release bars, which then move to operate
the release mechanism and allow the hammer to strike.
52.11 The sample is mounted or supported as in normal use on a rigid
wooden board, cable entries being left open, knockouts opened, and
‘*over-fixing and similar screws lightened with a torque equal to two-thirds
of that specified in Table 1 of Part 2 of this standard.
5.2.12 Three blows shall be applied to the point which is likely to be
the weakest, paying special attention to insulating material enclosing live
partsand to bushings of insulating material, if any. Additional samples
may be necessary to find the weakest point; in case of doubt, the test shall
be repeated on a fresh sample to which only three blows are applied.
5.2.13 After the test, the sample shall show’ no damage, in particular:

4 live parts shall not have become accessible;

. b) the effectiyeness of insulating linings and barriers shall not have
been impaired;
Cl the sample shall continue to afford the degree of protection
against ingress of dust and moisture, in accordance with its
classification; and
4 it shall be possible to remove and replace external covers without
these covers or their insulating linings breaking.
Breakage of an dsure is, how,ever, allowed if its removal does not
impair safety.
. ._

t+
 IS I 10322 ( Part 4 ) - 1984

5.2.14 If a translucent cover of a Class II luminaire that forms part of

the protection against electric shock fails the impact energy test at 0.50 Nm,
a further three samples shall be subjected to an impact energy test at
O-50 Nm and two of these samples shall pass the second test.
5.2.15 Damage to the finish, small dents which do not reduce creepage
distances or clearances below the value specified in 4, and small chips which
do not adversely affect the protection against electric shock, dust or
moisture, are neglected.

6. ENDURANCE TEST AND THERMAL TEST

6.1 Selection of Lamps and Ballasts

6.1.1 Lamps used for the tests of this clause shall be selected in
accordance with Appendix B.
6;1.2 The lamps used in the endurance test are operated above their
rated wattage for extended periods and should not be used for the thermal
tests. However, it is usually convenient to retain in the thermal test for
abnormal operation those lamps that have been used in the thermal test
for normal operation.
6.1.3 If the luminaire requires a separate ballast and this is not
supplied with the luminaire, a ballast shall be selected for test purposes
which is typical of normal production and which complies with the
relevant ballast specification. The power delivered to a reference lamp
by the ballast under reference conditions shall be within f 3 percent of
objective lamp power.
NOTE - For reference conditions [ see IS : 1534 ( Part 1 )-1977*].
6.2 Endurance Test

6.2.0 Under conditions representing cyclic heating and cooling in

service, the luminaire shall not become unsafe or fail prematurely.
Compliance shall be checked by carrying out the test described in 6.2.1.
6.2.1 Test

a> The luminaire shall be mounted in a thermal enclosure with

means for controlling the ambient temperature within the
thermal enclosure.
The luminaire shall be positioned on a similar supporting surface
( and in the same operating position ) as for the normal
operation thermal test ( see 6.3.1 ).
*Specification for ballasts for tubular fluorescent lamps: Part 1 For switch start
circuits ( srcond revision ).

17
IS : M322 ( Part 4 )- 19r14

b) The ambient temperature within the enclosure’ shall be

maintained within f 2°C of ( 1, + 10 )“C during the test. t, is
25°C unless otherwise marked on the luminaire. The initial
heating period of the luminaire is included as part of the test
_ . duration.
The ambient temperature within the enclosure shall be measured
in accordance with Appendix C. Ballasts for operation separate
from the luminaire shall be mounted in free air, not necessarily
in the thermal enclosure, and shall be operated in an ambient
temperature of 25 f ‘5°C.
c) The luminaire shall be tested in the encIosure for a total duration
of 168 hours, made up of seven successive cycles of 24 hours.
,Supply voltage, as described in 6.2;1 (d) shall be applied to the
luminaire during each cycle, except that the luminaire shall be
switched off for a continuous period of 3 hours at approximately
the same point in each of the 24 hour-cycles.
The circuit condition shall be as in normal operation for the first
six cycles, and abnormal operation for the seventh cycle.
For luminaires for which there is no abnormal condition, for
example, fixed .non-adjustable filament lamp luminaires, the total
test duration shall be 240 hours ( that is 10 x 24 cycles at
normal operation ).
d) During operating periods, the supply voltage for filament lamp
luminaires shall be 1.05 f 0.015 times the voltage at which the
rated wattage of the lamp is obtained and 1.10 f 0.015 times
rated voltage for tubular fluorescent and other discharge, lamp
luminaires.
e) If the luminaire ceases to operate because of chance failure of a
part of the luminaire ( including the lamp ), the instructions
in 6.3.1 (g) shall apply.
Arrangements should be made to signal a break in operation. The
effective test duration shall not be reduced as a consequence of
such a break. If a protective device in the luminaire ( for
example, a thermal or current cut-out ) operates, the device shall
be effectively short-circuited and the test shall be continued.
6.2.2 Compliance - After the test of 6.2.1, the luminaire shall be
visually inspected. No part shall have become unserviceable ( other than
as a chance failure as permitted in 6.2.1(e) and the luminaire shall not
have become unsafe. The marking shall be legible.
Symptoms of possible unsafe deterioration include cracks, scorches
and deformation. ,>
 IS : 10322 ( Part, 4 ) - 1984

6.3 Thermal Test ( Normal Operation ) - Under conditions represen-

ting normal service, no part of the luminaire ( including the lamp ), the
supply wiring within the luminaire, or the mounting surface shall attain a
temperature which would impair safety.
In addition, parts intended to be touched, handled, adjusted or
gripped by hand while the luminaire is at operating temperature shall not
be too hot for the purpose.
Luminaires shall not cause excessive heating of lighted objects.
Compliance shall be checked by carrying out the test described
in 6.3.1.
6.3.1 Test-Temperature shall be measured as indicated in 6.3.2 in
accordance with the following conditions:
a) The luminaire shall be tested on a mounting surface which is
suspended in a draught-proof enclosure so designed to avoid
excessive changes in ambient temperature. The mounting sur-
face and an example of a draught-proof enclosure are given in
Appendix D but other types of enclosure may be used if the
results obtained are compatible with those that would be obtained
by the use of the enclosure described in Appendix D [ For
ballasts separate from the luminaire [ see 6.3.1 (h) 1.
The luminaire shall be connected to the power supply with wiring
and any materials ( for example, insulating sleeves ) supplied with
the luminaire for the purpose.
In general, connection shall be in accordance with the instruc-
tions provided with the luminaire or marked on it. Otherwise,
wiring required to connect the luminaire under test to the supply
and not supplied with it, should be of a type representative of
common practice. Such wiring not supplied with the luminaire
is thereafter referred to as the test piece.
Temperature measurements shall be made in accordance with
the Appendices C and E.
b) The operating position shall be the thermally most onerous
operating position which may reasonably be adopted in service.
For fixed non-adjustable luminaires a position shall not be selec-
ted if it is stated to be not permissible in instructions supplied
with or marked on, the luminaire.
c) The ambient temperature within the draught-proof enclosure
shall be within the range 10 to 30°C and should preferably be
25°C. It shall not vary by more than f 1°C during measure-
ments and during a preceding period, long enough to affect the
results.

19
*ISS1032!2(Part4)-1984

If, however, a lamp has temperature-sensitive electrical charac-

teristics ( for example, a fluorescent lamp ), or if the ts rating of
the luminaire exceeds 30%, the objective ambient temperature
shall be within 5°C of the t,, rating, and should preferably be as
the 1, rating.

4 The test voltage for the luminaire shall be as follows:

Filament lamp luminaires: That voltage which produces 1.05
times, the rated wattage of the test lamp ( see Appendix B )
except that heat test source (H. T. S. ) lamps are always
operated at the voltage marked on the lamp.
Tubular fluorescent and other discharge lamp luminaires:
l-06 times the rated voltage.

Exemption:
For determination of the average winding temperature of a
component with t, marking, the test voltage shall be same as
the rated circuit voltage. This exemption does not apply, for
example, to measurement of a terminal block on the same
component.
NOTE - If a luminaire contains both a filament lamp and a tubular
fluorescent or other discharge lamp, it may be necessary to provide it
temporarily with two separate supplies.

During and immediately before a measurement, the supply

voltage shall be held within f 1 percent and preferably within
f 0.5 percent of the test voltage. The supply voltage shall be
held within h 1 percent of the test voltage during such preceding
period as may affect the measurement; this period shall not be
less than 10 minutes.
Measurements shall not be taken until the luminaire has stabi-
lized thermally, that is, temperatures are changing at a rate less
than 1°C per hour.
If the luminaire ceases to operate because of a defective part of
the luminaire ( including the lamp ), the part should be replaced
and the test continued. Measurements already made need not
be repeated, but the luminaire shall be stabilized before further
measurements are made. If, however, a hazardous condition
has arisen, or if any part becomes unserviceable as a type defect,
then the luminaire is deemed to have failed the test. If a pro-
tective device in the luminaire ( for example, thermal or current
cut-out of the one-shot or cycling types ) operates, the luminaire
is deemed to have failed.

20
 !,

IS:10322 (Part4)- 1984

l-4 Ballasts for operation separate from the luminaire shall be opera-
ted in free air and shall be operated in an ambient temperature
of 25 & 5°C. If a separate ballast is supplied with the luminaire,
temperatures of the ballast shall be measured and shall comply
with the same limits as incorporated ballasts. If a separate
ballast is not supplied with the luminaire, the temperatures of
the test ballast shall not be measured.

9 In case of doubt in the test for filament lamp luminaires, the test
shall be repeated with heat test source ( H.T.S. ) lamps, if
available. For temperatures which are mainly governed by the
cap temperature of the lamp, the values obtained by H. T. S.
lamps are decisive. For those temperatures which are mainly
governed by radiation, the vaIues obtained by normal produc-
tion lamps with clear bulbs are decisive.

k) The light beam from spothghts and similar Iuminaires is directed

towards the matt black painted wooden vertical surface similar to
that described in Appendix D. Luminaires are mounted at a
distance from the surface which is marked on the luminaire.
During the tests, measurements shall be made of the temperature
of certain insulating parts as required in 7.

TABLE 5 MAXIMUM TEMPERATURES UNDER THE TEST CONDITIONS

FOR PRINCIPAL PARTS

(Clause 6.3.2 )

PART MAXI~USZ TEYPERATURE ( “C )

Lamp caps:

ES, BC types: junction with glass cemented 210*

caps
Mechanically locked (lamp life > 3 000 h ) 250
Mechanically locked ( lamp life > 3 000 h ) 275
Halogen types: pinch temperature Value under consideration

Winding ( ballast, transformer ):

If tw is marked iw
If IW is not marked ( paper interleaved ) 95
If tw is not marked (not separated by paper ) 85
Starter canister: t
( Continued )

21
IS : 10322 ( Part 4 ) - 1984

TABLE 5 MAXIMUM TEMPERATURE UNDER THE TEST CONDITIONS

FOR PRINCIPAL PARTS - Contd

PART MAXIMUM TEUPERATURE ( ‘C )

Capacitor case:
If tc is marked tc
If tc is not marked 50
Insulation of wiring [see Table 6 and 6.3.2(b) and
6.3.2 (c) ]
Insulating material ( other than ceramic ) of
lampholders:

E14and B15 135

E26, E27 and B22 165
E39 and E40 225

Switches marked with individual ratings:

Without T marking 55
With T marking T

Other parts of the luminaire:

( according to material and use ) [see Table 6 and 6.3.2(b) I

Mounting surface:

Normally flammable surface 90

Non-combustible surface Not measured

Parts intended to be handled or touched

frequentlyf:

Metal parts 70
Non-metal parts 85

Parts intended to be gripped by hand:

Metal parts 60
Non-metal parts 75

Objects lighted by spotlights

[see 6.3.5( k ) ] ( of the te?surface )

*For luminaires marked with information concerning the use of special lamps, or
if it is obvious that special lamps are to be used, a higher value, as specified by the
lamp manufacturer, is allowed.

tValue under consideration.

TNot applicable to parts intended only to be touched occasionally during adjust-

ment, for example parts of spotlights.

22
 IS : 10322( Part 4 ) - 1984

TABLE 6 MAXIMUM TEMPERATURES UNDER THE TEST

CONDITIONS FOR COMMON MATERIALS USED IN LUMINAIRES

( Clause 6.3.2 )

MATERIAL MAXIMUM TEMPERATURE (“C )

Insulation of wiring ( internal and external,
supplied with luminaire ):
Glassfibre silicon-varnish impragnated 200*
Polytertrafluoroethylene ( PTFE ) 250
Silicone rubber ( not stressed ) 200
Silicone rubber ( compressive stress only ) 170
Ordinary polyvinyl chloride ( PVC) 9O.t
Heat-resisting polyvinyl chloride ( PVC ) 105
Ethylene vinyl acetate ( EVA ) - 140
Thermoplastics:

Acrylonitrile-butadiene-styrene ( ABS ) 95
Cellulose acetate butyrate ( CAB ) 95
Polymethyl methacrylate (acrylic ) 90
Polystyrene 75
Polypropylene 100
Polycarbonate 130
Polyvinyl chloride ( PVC ) ( where not used 100
for electrical insulation )
Polyamide ( nylon ) 120

Thermosetting piastics:
Mineral-filled phenol-formaldehyde ( PF ) 165
Cellulose-filled phenol-formaldehyde ( PF) 140
Urea-formaldehyde ( UF ) 90
Melamine 100
Glassfibre-reinforced polyester ( GRP ) 130

Other materials:
Resin-bonded paper/fabric 125
Silicone rubber ( where not used for electrical 230
insulation )
Rubber where not used for electrical insulation 70

*Reduced by 15°C where insulation is stressed, for example, lamped or flexed.

TCable specifications usually quote 70°C Max, for ordinary grade PVC. The value
of 90°C is justified, however. because of the special conditions under which luminaires
are tested for relatively short periods even for “ normal operation “, for example,
draught-proof enclosure and test supply voltage above the rated value for the luminaire.

23
IS z. 10322 ( Part 4 ) - 1984

6.3.2 Com$‘ance - In the test of 6.3.1 none of the temperatures shall

exceed the appropriate values given in Tables 5 and 6 ( subject only to
the concession of 6.3.2(a), when the luminaire is operated at its rated
ambient temperature t,.
In those cases where the temperature in the test enclosure differs
from t,, this difference shall be taken into account when applying the limits
in the tables [ see also 6.3.1(c) 1.

4 The temperatures shall not exceed the values shown in Tables 5

and 6 by more than 10°C. If the temperature of any part exceeds
the value shown in tables by 10°C or less, the test shall be repea-
ted, the luminaire measuring devices, including thermocouples,
being dismantled and reassembled before retesting.

Then, the temperature of the mounting surface shall not exceed

the value shown in the table and the temperature of any other
part shall not exceed the value shown in the table by more than
5°C.
NOTE- The allowance of 10°C and repetition of the test with an
allowance of 5°C are made to take into account the inevitable variability of
temperature measurements in luminaires.

b) The temperature of any part of the luminaire liable to thermal

degradation in service shall not exceed a value which corresponds
to a reasonable service period for the particular type of luminaire.
Generally agreed values for principal parts of luminaires are
given in Table 5 and values for common materials, when used in
luminaires, are listed in Table 6. These values are prescribed
here to obtain uniform assessment; slightly different values may
be quoted elsewhere on the basis of other forms of materials
testing or for other applications.

If materials used are claimed to withstand higher temperatures

tha.n those shown in Table 6, or if other materials are used, they
shall not be exposed to temperatures in excess of those which
have been proved permissible for these materials.

C>The temperature of the test piece [ see 6.3.1(a) ] of PVC

insulated shall not exceed 90°C ( or 75’C where it is stressed, for
example, clamped ) or such higher temperatures as may be indi-
cated on the luminaire or in the manufacturer’s instructions
supplied with the luminaire in accordance with the requirements
in 6 of Part 2 of this standard. The limit shall be 120°C for a
wire in a heat-resisting sleeve supplied with the luminaire.

6.4 Thermal Test ( Abnormal Operation ) - Under conditions

representing abnormal service conditions ( where applicable; but not

24
 IS : 10322( Part 4 ) - 1984

representing a defect in the luminaire or misuse ), no part of the luminaire,

the supply wiring within the luminaire or the mounting surface, shall
become unsafe.
Compliance shall be checked by carrying out the test described
in 6.4.1.
6.4.1 Test - Temperatures of parts listed in Table 7 shall be measured
in accordance with the following conditions:
a) The test shall be made if, during service, the luminaire could be
in an abnormal condition as in cases (i), (ii) or (iii) below, and
if this condition would cause any part to be at a higher tempera-
ture than during normal operation ( for which a preliminary
trial may be needed ).
If more than one abnormal condition is possible, that condition
shall be selected which most adversely affects the results of the
tests.
The test is not applicable to fixed non-adjustable filament lamp
luminaires except in case of (iii) below:
i) A possibly unsafe operating position arising other than from
misuse; for example, if by accident an adjustable luminaire is
bent close to the supporting surface.
ii) A possibly unsafe circuit condition arising other than from
defective manufacture or misuse; for example, a circuit condi-
tion occurring at the end of the service period of a lamp of a
starter ( see Appendix F ) .
iii) A wssiblv unsafe oneration condition arising from the use of a
’ GLS lamb in a filament lamp luminaire inte%ded for a special
lamp; if, temporarily, a special lamp is replaced by a GLS
lamp of the same wattage.
Test (ii) is applicable only to tubular fluorescent and other
discharge lamp luminaires.
The luminaire shall be tested under the conditions specified in
(a), (c), (e), (f) and (h) of 6.3.1. In addition the following
shall apply:
b) The test voltage shall be a7 follows:
Filament lamp luminaires - as specified in 6.3.1 (d). Tubular
fluorescent and other discharge lamp luminaires - 1’10 times the
rated voltage.
NOTE - If a luminaire contains both a filament lamp and a tubular
fluorescent or other discharge lamp, it may be necessary to provide it
temporarily with two separate supplies.

4 If the luminaire ceases to operate because of a defective part of

the lumiuaire (including the lamp ), the part should be replaced

25
IS t.10322 ( Part 4 ) - 1984

and the test continued. Measurements already made need not

be repeated but the luminaire shall be stabilized before further
measurements are made. If, however, a hazardous condition has
arisen, or if any part becomes unserviceable as a type defect, then
the luminaire is deemed to have failed the test.
1f.a protective device in the luminaire ( for example, a thermal
or current cut-out of the one-shot or cycling types ) operates
during the test, the highest temperature reached should be taken
as the final temperatures.

d) If the luminaire incorporates a capacitor ( other than a capaci-

1 tor connected directly across the supply ), the capacitor shall be
short-circuited, notwithstanding the requirements of Appendix F
if the voltage across it under test conditions would exceed 1.25
times its rated voltage for self-healing capacitors or 1.3, times its
rated voltage for non-self-healing capacitors.
+ 6.4,2 Compliance - In the test of 6.4.1, none of, the temperatures shall
exceed the appropriate value as given in Table 7 [ subject only to the
concession of 6.4.2(a) 1, when the luminaire is operated at its rated tem-
perature t,. In those cases where the temperature of the test enclosure
differs from ta, the difference shall be taken into account when applying
the limits in the table.
a) The temperatures shall not exceed the values shown in Table 7 by
more than 10°C. If the temperature of any part exceeds the
value shown in Table 7 by 10°C or less, the test shall be
repeated, the luminaire measuring devices, including thermo-
couples, being dismantled and reassembled before retesting.
Then, the temperature of the mounting surface shall not exceed
the value shown in Table 7 and the temperature of any other
part shall not exceed the value shown in Table 7 by more than
5°C.
6.5 Thermal Test ( Failed Ballast or Transformer Conditions )
These tests apply only to luminaires marked with the v symbol

and incorporating ballasts and transformers which, during failure .of the
winding or windings, may cause overheating of the mounting surface. These
tests do not apply where the v symbol requirements are met by

spacing the ballasts and transformers from the mounting surface in accord-
ance with the requirements of 16.2.1 and 16.2.2 of Part 2 of this standard.
These requirements and tests are based on the assumption that
‘during failure of the ballast ‘or transformer, for example, owing to short-
26
 g$ : 16322 ( Part 4 ) -‘19&d
circuited windings or a short-circuit to the case, the ballast or transformer
winding will not exceed 350°C for a duration of more’than 15 minutes
and, therefore, the temperature of the mounting surface will not exceed
180°C for a duration of more than 15 minutes.
TABLE 7 MAXIMUM TEMPERATURES UNDER THE TEST CONDITIONS
( Clause 6.4.2 )
PART MAXIMIJN TEMPERATURE ( “C )
Winding ( ballast, transformer ):
If IW is not marked 1702
If tw is marked:
tw 90 170
95 177
100 185
105 193
110 200
115 208
120 216
125 223
130 230
Capacitor case:
If Ie is not marked 60
If te is marked tc+ 10
Mounting surface:
Normally flammable surface ( filament lamp 175
luminaires )t
Normally flammable surface ( luminaires 130
symbol )
v

Non-combustible surface ( luminaires Not measured

without symbol ) .,_
v

*Applies to paper interlayered windings and those not separated by paper.

iExcluding luminaires incorporating transformers.

6.5.1 Testfor Luminaires.Without Thermal Cut-outs - The luminaire shall

be tested under the conditions specified in (a), (c), (e), (f) and (h) of
6.3.1. In addition, the following also apply:
20 percent of the lamp circuits in the luminaire, and not less than
one lamp circuit, shall be subjected to abnormal conditions ( see
Appendix F ).
The circuits which have the most thermal influence on the mounting
surface shall be chosen and other lamp circuits shall be operated at rated
voltage under normal conditions.
The circuits subjected to abnormal conditions shall be operated at
0.9, 1.0 and 1.1 times rated the voltage. When conditions are stable at
27
IS : 10122( Part 4 ) - 1984

each of these three test voltages, the highest winding temperature and
highest temperature of any part of the mounting surface shall be
measured.
6.5.1.1 Compliance - After the test of 6.5.1:
a) The temperature of the mounting surface shall not exceed 130°C
when the lamp circuits subjected to abnormal conditions, is ( are 1
operated at l* 1 times the rated voltage.

4 #--(1)

601 I I I I I -*
60 100 200 300 350 LOO ’

WINDING TEMPERATURE (VI

Explanation of points on the graph

(1) Limiting value of mounting surface temperature in case of failed
winding.
(2) Limiting value of mounting surface temperatures during abnormal opera-
tion at 1’1 times rated voltage [see 6.5.1.1(a) 1.
(3J-l Measuring points at 0.9, 1’0 and 1’1 times rated voltage respectively
[see 6.5.1.1(b) 1.
$1’
(6) Straight line drawn through three m*.asurirlg points and indicating a
satisfactory luminaire as the extrapolation of the line to a winding
temperature of 35°C is below a mounting surface temperature of 180°C.
(7)
Straight line drawn through three measuring points and indicating a
lnminaire which fails the test because the extrapolation of the line
exceeds a mounting surface temperature of 180°C before reaching a
winding temperature of 350°C.
(8)
Assumed baximum value of the winding temperature of a failed
winding.
FIG. 5 GRAPH AS PER CLAUSE6.5.1.1
28
 IS : 103?2 ( Part 4 ) - 1984

b) The values of the temperatures measured at 0.9, 1.0 and 1-l times
the rated voltage are plotted on a graph ( See Fig. 5 ) and the best
straight line is drawn through these points. The extrapolation
of this straight line shall not reach a point representing a mount-
ing surface temperature of 180°C at a ballast or transforms-’
winding temperature of less than 350°C.
6i5.2 Test for Luminaires’ with Thermal Cut-outs External to the Ballastor
Transformer - The luminaire shall be set up for this test as described
in 6.5.1.
The circuits subjected to abnormal conditions shall be operated with
slowly and steadily increasing current through the windings until the
thermal cut-out operates. Time intervals and increments in current shall
be such that thermal equilibrium between winding temperatures and
mounting surface temperature& is achieved as far as is practicable. During
the test, the highest_temp,erature of -any part of the surface on which the
luminaire is mounted shallbe continuously measured. This completes the
test for luminaires fitted with thermal links.
For lummaire fitted with manual-reset thermal cut-outs, the test shall
be repeated six times allowing a 30 minutes interval between tests. At the
end of each 30 minutes interval, the cut-out shall be reset.
For luminaires fitted with auto-reset thermal cut-outs, the test shall
be continued until a stable mounting surface temperature is achieved.
6.5.2.1 Compliance - The highest temperature of any part of the
mounting surface shall not exceed 180°C at any time during tests for
thermal links and manual-reset thermal cut-outs, or 13G’C during test for
auto-reset thermal cut-outs.

-‘RESISTANCE TO HEAT, FIRE AND TRACKING

7.1 Resistance to Heat - External part of insulating material providing

protection against electric shock, and retaining live parts in position shall
be sufficiently resistant to heat.
,., 7.1.1 Test - Compliance shall be checked by the following test:
The test is not made on parts of ceramic material or on the insulating
of wiring.
The test shall be made in a heating cabinet having a tempera&z
of 25 4 5°C in excess of the operating temperature of the relevant part
determined during the temperature test ( normal operation ) of 6 with a
minimum temperature of 125°C when parts retaining live parts in position
are tested.

829
Is : 10322 ( Part 4 ) - 1984

The surface of the part to be tested shall be placed in the horizontal

position and a steel ball of 5 mm diameter pressed against this surface with
a force of 20 N. A suitable apparatus for this test is shown in Fig. 6. If
the surface under test bends, the part where the ball presses should be
supported.

L 2*5rntn R
SPHERICAL
TEST SAMPLE

FIG. 6 BALL-PRESSUREAPPARATUS
After 1 hour the ball shall be removed from the sample and the
sample shall be cooled by immersion in cold water for 10 s. The diameter
of the impression shall be measured and shall not exceed 2 mm.
7.2 Resistance to Flame and Ignition
7.2.0 Parts of insulating material retaining live parts in position and
external parts of insulating material providing protection against electric
shock shall be resistant to flame and ignition.
7.2.1 Parts of insulating material retaining live parts in position shall
withstand the following tests:
The parts to be tested are subjected for 10 s to a butane gas flame
( at least 95 percent purity ) 12 f 2 mm long from a burner consisting of
a tube having a bore of 0.5 f 0.1 mm. The test is conducted in still air
and at least half the flame shall be applied to the sample.
Any self-sustaining flame shall extinguish within 30 s of removal of
the gas flame and any burning drop from the sample shall not ignite a
piece of cotton gauze, consisting of five layers, spread out horizontally
500 mm below the test sample.
The requirements of this clause do not apply in those cases where
the luminaire provides an effective barrier to burning drops.
7.2.2 Parts of insulating material which do not retain live parts in
position but which provide protection against electric shock, shall with-
stand the following tests:
Parts are subjected to a test using an electrically heated conical
mandrel in an apparatus shown in Fig. 7.
30
 IS : 10322( Part 4 ) - 1984

TERMINALS FOR THERMOCOUPLES

I I

I , I

FIG. 7 HOT MANDREL APPARATUS

31
‘IS : 19322 ( Part 4 ) - 1984

The mandrel is inserted into a conical hole reamed in the part

to be tested in such a way that portions of the conical part of the
mandrel of equal lengths protrude from both sides. The sample is
pressed against the mandrel with a force of 12 N. The means by
which the force is applied is then locked to prevent any further
movement. The mandrel is heated to 300% in approximately
3 minutes and this temperature is maintained within &lO”C for
2 minutes and is measured by means of a thermo-couple inside the
mandrel. During the test, sparks of about 6 mm in length are
produced at the upper surface of the sample where the mandrel
protrudes, by means of a high-frequency spark generator. -
Neither the sample nor any gas produced during the heating
shall be ignited by the sparks.
: ’
The spark generator shall produce only’ sufficient energy for
this purpose. It shall not ignite an unheated sample.

The test is not made on parts of ceramic material.

7.2.3 Parts of insulating material which are not included in 7.2.1 or

7.2.2,‘for example, covers, shades or the like, shall:

a) withstand the 300°C hot mandrel test of 7.2.2.

b) comply with the spacing requirements of appropriate clause in

Part 2 of this standard.

7.3 Resistance to Tracking - Insulating parts of luminaires other than

ordinary luminaires, which retain live parts in position or are in contact
with such parts, shall be of material resistant to tracking unless they are
protected against dust and moisture.
7.3.1 Test - Compliance shall be checked by the following test which
_.
shall be made at three places on the test sample:

The test should not be made on parts of ceramic material.

A flat surface of the part to be tested, if possible at least

15 x 15 mm with a thickness corresponding to that of the material
used in the luminaire, shall be placed in a horizontal position. Two
electrodes of platinum of the dimensions shown in Fig. 8, shall be placed
on a surface of the sample in a manner shown, so that the rounded edges
are in contact with the sample over their whole lengths.

The force exerted on the surface by each electrode shall be about

1 N. The electrodes shall be connected to a 50 Hz supply source having
a voltage of 175 V of substantially sine-wave form. The total impedance

32
c _.__ -7

IS t 10322( Part 4 ) - 1994

ELECTRODE

SAMPLE

L SLIGHTLY ROUNDED
EDGE
All dimensions in millimetres.
FIG. 8 ARRANGEMENTANDDIMENSIONS OF THE ELECTRODES
FOR THETRACKING TEST
of'the circuit when the electrodes are short-circuited shall be adjusted by
means of a variable resistor so that the current is 1.0 f 0.1 A with
cos $6 = 0.9 to 1. An overcurrent relay, with a tripping time of at least
0.5 S,shall be included in the circuit.
The surface of the sample shall be wetted by allowing drops of a
solution of ammonium chloride in distilled water to fall centrally between
the electrodes. The solution shall have a volume resistivity of 400 Q cm
at 25°C corresponding to a concentration of about 0.1 percent. The
drops shall have a volume between 20 and 25 mms and fall from a height
of 30 to 40 mm. The time interval between one drop and the next shall
be 30 f 5 s.

33
IS I 10322 ( Part 4 ) - 1984

7.3.1.1 No flashover or breakdown between electrodes shall occur

before a total of 50 drops has fallen. In case of doubt, the test shall be
repeated, if necessary, on a new sample. Care should be taken that the
electrodes are clean, correctly shaped and positioned before each test is
started.
8. RESISTANCE TO CORROSION

8.1 Ferrous parts of drip-proof, rain-proof, splash-proof, jet-proof, water-

tight and pressure water-tight luminaires, the resulting of which might cause
the Iuminaire to become unsafe, shall be adequately protected against
ruting. Luminaires shall be checked for resistance to corrosion by the
following tests:
AU grease is removed from the parts to be tested, by immersion in
carbon tetrachloride for 10 minutes. The parts are then immersed
for 10 minutes in a 10 percent solution of ammonium chloride in
water at a temperature of 20 f 5°C. Without drying, but after
shaking off any drops, the parts are placed for 10 minutes in a box
containing air saturated with moisture at a temperature of 20 f 5%.
After the parts have been dried for 10 minutes in a heating cabinet
at a temperature of 100 f 5”C, their surface shall show no signs of
rust.
Traces of rust on sharp edges and any yellowish film removable
by rubbing are ignored.
For small heIicaI springs and the Iike, and for inaccessible parts
exposed to abrasion, a layer of grease may provide sufficient protec-
tion against rusting. Such parts are subjected to the test only if
there,is doubt about the effectiveness of the grease film, and the test
is then made without previous removal of the grease.
8.1.1 Contacts and other parts made of rolled copper of copper alloy
sheet, the failure of which might cause the luminaire to become unsafe,
shah be free from season cracking.
Compliance shall be checked by inspection and for luminaires other
than ordinary, by the test given in 8.5.
The test given in 8.5 is made only in case of doubt.
8.1~2 Parts of aluminium or aluminium alloy in drip-proof, rain-proof,
splash-proof, jet-proof, water-tight and pressure water-tight luminaires, shall
be resistant to corrosion, if otherwise the Iuminaire might become unsafe.
8.2 Mercurous Nitrate Test for Copper and Copper Alloys

This describes the technique for conducting the mercurous nitrate

test of wrought copper and copper alloy products. It is an accelerated test

34
 IS t 10322 ( Part 4 ) - 1984

for the purpose of detecting the presence of residual ( inttrnal ) stresses that
might bring about failure of the material in service or storage through
stress corrosion cracking.
While this method has also been used for testing assemblies and
partial assemblies, the method is not intended for that purpose, and some
modification may be required for such use.
82.1 Mercurous .Nitrate Solution- The solution is an aqueous mercurous
nitrate solution containing 10 g of HgNOs and 10 ml of HNOs ( density
l-40 to 1*42g/cms ) per litre of solution.
This aqueous mercurous nitrate solution is to be prepared by either
of the following procedures A or B:
Procedure A : Dissolve 11.4 g of HgNOs, 2HsO or. 10-7 g of HgNOs,
HsO in approximately 40 ml of distilled water, acidified with 10 ml of
HNOs. After the crystals are completely dissolved, dilute the solution
with distilled water to 1 000 ml.
Procedure B : Dissolve 76 g of mercury in 114 ml of diluted HNOs
( one part water to one part HNOs ). Carefully dilute with distilled
water to 1 000 ml. This provides a concentration of 100 g of HgNCs per
litre and an excess of 30 ml of HNOs after a slight loss due to heating.
Add the water in small portions while stirring to prevent local overdilu-
tion. This gradual dilution, together with the excess acid, will prevent
precipitation of basic salts of mercury. Dilute 100 ml of this solution
( 10 percent ) with 7 ml of HNOs and 893 ml of water.
A solution of which the concentration is not in accordance with that
specified should not be used.
The mercurous nitrate crystals are obtainable in both the mono-
hydrate and dihydrate form and should be handled with caution because
of their highly toxic effects. When weighing crystals, the weight of water
of crystallization should be taken into consideration. The mercurous
nitrate crystals are photosensitive and when they have turned yellow are
difficult to dissolve.
If heating is used in either of these procedures for preparing the
mercurous nitrate solution, care should be exercised to avoid loss of
HNOs.
8.2.1.1 Test piece - The test is made on test pieces taken from the
luminaire.
8.2.1.2 Procedure - The test piece should be first degreased. Totally
immerse the test piece in an aqueous solution of sulphuric acid ( 15 per-
cent by volume ) or in an aqueous solution of 60 percent water and 40 per-

35
IS :10322 (Part4) -1984

cent concentrated HNOs for a period not exceeding 30 seconds, to remove

all traces of carbonaceous matter and oxide films. Remove the test piece
from the pickling solution and wash it immediately in running water. Then
drain the test piece free of excess water and totally immerse it in the
mercurous nitrate solution with at least 15 ml of mercurous nitrate solution
per square centimetre of exposed surface of the test piece.
After 30 minutes, remove the test piece from the mercurous nitrate
solution and wash it in running water. Wipe off any excess mercury from
the surface of the test piece. The test piece is allowed to dry.
The test piece shall show no crack visible to the naked eye 24 hours
after washing.
In cases of doubt regarding the presence of cracks, volatilize ( with
caution ) the mercury on the surface of the test piece by the application of
heat on a hot-plate or in an oven. Then examine the specimen for cracks
under suitable magnifying equipment at a magnification of 10 to 18
diameters.
CAUTION - Equipment for the detection and removal of mercury
vapour produced in volatilization should be used, The use of rubber
gloves is adviseable.

APPENDIX A
( Clause 3.2.6 )

TEST ,TO ESTABLISH WHETHER A CONDUCTIVE PART

IS A LIVE PART WHICH MAY CAUSE AN ELECTRIC
SHOCK

A-l. In order to determine whether a conductive part is a live part which

may cause an electric shock, the luminaire is operated at rated supply-
voltage and nominal frequency and the following tests conducted:
a) The current flowing between the part concerned and earth is
measured, the measuring circuit having a non-inductive resis-
tance of 2 000 Q. The part concerned is a live part if a current
of more than 0.7 mA ( peak ) is measured.
b) The voltage between the part concerned and any accessible part
is measured, the measuring circuit having a non-inductive resis-
tance of 50 000 Q. The part concerned is a live part if a voltage
of more than 34 V ( peak ) is measured.
A-2. For the above tests, one pole of the test supply shall be at earth
potential.

36
 IS : 10322 ( Part 4 ) - 1984

APPENDIX B
( Clause 6.1.1 )

TEST LAMPS

B-l. For the tests of 6, it is convenient to keep a stock of lamps of types

commonly required. These should be carefully selected from normal
production lamps for characteristics as close as possible to the objective
characteristics listed in the appropriate standards. The selected lamps
should be aged ( at least 24 hours for filament lamps and at least 100 h for
tubular fluorescent and other discharge lamps, with occasional off-periods ),
and a further check should be made that their characteristics are still
satisfactory and stable. Lamps should not be retained as test lamps for
longer than about three-quarters of their typical operating period in
normal service. Lamps should be inspected before each test for any
damage or signs of approaching unserviceability. Discharge lamps should
be checked regularly to ensure that there has been no appreciable shift in
electrical characteristics which influence the temperatures in luminaires.
If a lamp can be inserted in a circuit in more than one position - for
example a fluorescent lamp - marks should be made to assist consistent
insertion. Great care should be taken in handling test lamps; in particu-
lar, sodium and mercury-halide discharge lamps and amalgam fluorescent
lamps should not be moved while still hot.

B-2. A lamp selected for a particular test shall be of a rating and type for
which the luminaire is claimed to be suitable. If a choice of lamp shape,
construction or finish is indicated by the manufacturer, the thermally most
onerous shall be taken. Otherwise, the most common type shall be used.
B-3. The following requirements refer to the selection of lamps as test
lamps, and to lamp selection for particular test of a luminaire.
B-3.1 Filament lamps
B-3.1.1 For types in common use, a selection should be made of lamps
with cap temperature measured under the conditions described in IS : 8913-
1978* above the average for production lamps and preferably from the
high-temperature end of the production spread. ( This requirement does
not apply to lamps for use only in the endurance test. )
B-3.1.2 If the luminaire is provided with a marking for special lamps,
if it is obvious that special lamps are to be used in the luminaire, the test
is made with such special lamps. In all other cases, the luminaire is
fitted with general lighting service ( GLS ) lamps.
-
*Standard method of measurement of lamp cap temperature rise.

37
ZS : 10322( Part 4 ) - 1984

B-3.1.3 Lamps are chosen in accordance with the rated wattage of the
luminaire, but when the luminaire has E 27 or B 22 lampholders, a GLS
lamp with a rated wattage of not less than 60 W shall be used and if the
luminaire has El4 or B15 lampholders a GLS lamp with a rated wattage
of not less than 40 W shall be used.
B-3.1.4 This requirement does not apply, however, if it is obvious that
the luminaire should not be used with such lamps.

B-361.5 The voltage rating of a test lamp shall by typical of the voltage
rating of filament lamps in the market for which the luminaire is intended.
If the luminaire is intended for two or more different groups of voltage
supplies. For example, for 200 - 250 V and for 100 - 125 V, then the
test lamp shall be the one suited to the lowest voltage range ( that is the
one with the highest current ).

B-3.1.6 If a lamp is operated in conjunction with a component ( for

example, a transformer with 24 V output ) inside the luminaire, the voltage
rating of the test lamp shall be in accordance with the marking of the
component or similar instructions.

B-3.2 Tubular Fluorescent and Other Discharge Lamps

B-3.2.1 When a lamp is operated under reference conditions ( accor-

ding to the IS standard ), the lamp voltage, current and power shall be as
close as possible to the IS1 objective values, and shall be within 2.5 per
cent of these values.
B-3.3 If a reference ballast is not available, lamps may be selected using
a productiqn ballast, which at the calibration current, has an impedance
within fl percent of that of the reference ballast. The characteristics
of preheated electrodes shall be as close as possible to the objective values.
NOTE 1 -A discharge lamp, incorporating a series filament, is described as a
filament lamp for the purpose of clause 6. If the luminaire is for use with filament
lamps or discharge lamps incorporating series filament, it should be tested with the
more onerous ( or if not known, with each in turn ).
NOTE 2 -If the luminaire is for use with a combination of lamp type? ( for
example, a filament lamp plus a discharge lamp ), it should be tested with the
thermally most onerous combination.
If the luminaire is for use with either filament or discharge lamps, it should be
tested with the more onerous ( or, if not known, with each in turn ).
It is usually found that translucent materials attain a higher temperature with
a discharge lamp or a discharge lamp incorporating a series filament than with a
filament lamp, for a given lamp power.
NOTE 3 - If the luminaire is designed for a lamp type for which specifications
have not yet been established, a test lamp should be selected after consultation with
the lamp manufacturer.

38
 IS : 10312 ( Part 4 ) - i984

APPENDIX C
( Clause 6.2.1 and 6.3.1 )

TEMPERATURE MEASUREMENT

C-l; The following recommendations refer to methods of making

temperature measurements on luminaires in a draught-proof enclosure in
accordance with 6.3.5. These methods of measurement have been
evolved as particularly suitable for luminaires; alternative methods may be
used if it is established that they are of at least equal precision and
accuracy.
C-2. Temperatures of solid materials are usually measured by means of
thermocouples. The output voltage is ready by a high-impedance device
such as a potentiometer. With a direct-reading instrument it is important
to check that its input impedance is suited to the impedance of the
thermocouple. Temperature-indicators of the chemical type are at present
suitable only for rough checks of measurements.
C-3. The thermocouple wires should be of low thermal conductivity. A
suitable thermocouple consists of 80/20 nickel-chromium paired with 40/60
nickel-copper ( or with 40/60 nickel-aluminium ). Each of the two wires
( usually of strip form, or circular in section ) is fine enough to pass
through a 0.3 mm hole. All the end-portions of the wires liable to be
exposed to radiation have a high-reflectance metal finish. The insulation
of each wire is of suitable temperature and voltage rating; it is also thin
but robust.

C-4. Thermocouples are attached to the measuring point with minimum

disturbance ofthermal conditions and with low-resistance thermal contact.
If a particular point on a part is not specified, the point of highest
temperature should be found by preliminary exploration ( for this purpose,
a thermocouple may be mounted in a holder made of material of low
thermal conductance; instruments using thermistors are also convenient ).
It is important to explore materials such as glass, since temperature may
vary rapidly with position. Thermocouples mounted within or near a
luminaire should have minimum exposure to conducted or radiant heat.
Care should also be taken to avoid voltage from current carrying parts.

C-5. The following methods have been found useful for attaching thermo-
couple junctions at measuring points:

a) Mechanical clamping, for example, under fixing device ( clamp

ing under current carrying parts is deprecated ) .
b) Soldering to a metal surface (with a minimum account of
solder ) .

39
1s : 10322 ( hrt 4 ) - 1984

4 By an adhesive ( minimum amount required ). The adhesive

( should not separate the thermocouple from the measuring point.
An adhesive used, with a translucent material should be as
translucent as possible. A suitable adhesive for use with glass is
formed of one part of sodium silicate to two parts of calcium
sulphate with water medium. On non-metal parts the last
20 mm of the thermocouple is attached to the surface to offset
the flow of heat from the measuring point.
4 Cables. The insulation is slit and the thermocouple inserted
( without touching a conductor ); the insulation is then bound
UP-
4 Mounting surface ( see Appendix D ). A thermocouple is attach-
ed to a copper disc ( approximately 5 mm diameter, 1 mm thick-
ness, and with a matt black finish ), sunk level with the surface
at the hottest point.
C-6. The average ambient temperature in the draught-proof enclosure is
taken to be the air temperature at a position near one of the perforated
walls on a level with the centre of the luminaire. The temperature is
usually measured by a mercury-in-glass thermometer. An alternative
sensor is a thermocouple or thermistor attached to a small metal vane
shielded against radiation.
C-7. The average temperature throughout a winding is measured by the
change-in-resistance method. The procedure to be followed is described
in Appendix E.
NOTE - It is found that errors are often made in the estimated calculation; an
independent rough check should be made by measuring the case temperature of the
component and adding a winding-to-case differential appropriate to the construction.
C-8. It is important that all temperature measuring instruments should
be checked regularly. It is also recommended that measuring authorities
should interchange luminaires to improve consistency in the measurement
of different materials at different temperature levels.

APPENDIX D
( Clause 6.3.1 )

DRAUGHT-PROOF ENCLOSURE

D-1. The following recommendations refer to the construction and use of

a suitable draught-proof enclosure for luminaires, as required for
the tests of normal and abnormal operation. Alternative constructions

40
 IS t 10322( Part 4 ) - 1984

for draught-proof enclosures are suitable if it is established that similar

results are obtained.

The draught-proof enclosure is rectangular, with a double skin on

top and on at least three sides, and with a solid base. The double skins
are of perforated metal, spaced apart approximately 150 mm, with regular
perforations of 1 to 2 mm diameter, occupying-about 40 percent of the
whole area of each skin.

The internal surfaces are painted with a matt paint. The thrke
principal internal dimensions are each at least 900 mm. There should be
a clearance of at least 200 mm bettieen the internal surfaces and any part
of the largest luminaire for which the enclosure is designed. Alternative
constructions for draught-proof enclosures are suitable if it is established
that similar test results are obtained.

NOTE - If it is required to test two or more luminaires in a large enclosure,

care should be taken that radiation from one luminaire cannot affect any other.

There is i clearance of at least 300 mm above the top of the

enclosure and around the perforated sides. The enclosure is at a location
protected as far as possible from draughts and sudden changes in air
temperature; it is also protected from sources of radiant heat.
A luminaire under test is positioned as far away as possible from the
six internal surfaces of the enclosure. The lumiriaire is mounted ( subject
to the requirements of 6.3.1 and 6.4.1 ) as under service conditions.

A luminaire for direct fixing to a ceiling or wall should be fixed to a

mounting surface comprising a wood or wood-fibre board. A non-combusti-
ble insulating material should be used if the luminaire is not suitable for
mounting on a, combustible surface. The board is approximately 15 mm
thick, and extends not less than 100 mm ( but preferably not more than
200 mm ) beyond the normal projection of the smoothed outline of the
IutiinLire. There is a clearance of at least 100 mm between the board
and the internal surfaces of the enclosure. The bsard is painted black
with a matt non-metallic paint.

A luminaire for corner-fixing should be fixed in a corner comprising

two boards each complying with the preceeding requirements.

A third board is required if the luminaire is to be fixed in a vertical

corner immediately below a simulated ceiling.

Recessed luminaires are mounted in a test recess, consisting of a

suspended ceiling, on top of which is a rectangular box with vertical sides
and horizontal top.

41
 The suspended ceiling is made of a 12 mm thick porous wood fibre
board, in which a suitable opening has been made for the luminaire. The
wood fibre board reaches at least 100 mm outside the projection of the
luminaire on this board. The vertical sides of the box are made of 19 mm
thick laminated wood. During the test, these sides are placed at a
distance of 50 mm or 75 mm from the luminaire, where it is mounted in
the suspended ceiling. The top of the box is placed at a distance of
approximately 25 mm from the substantially flat top surface of the
luminaire, and is made of a 12 mm thick porous wood fibre board which
is tightly sealed to the sides of the box. If there are spacers or connecting
boxes on top of the luminaire which project more than 25 mm above its
top surface, these spacers or connecting boxes should be placed in direct
contact with the top of the test box.
The suspended ceiling and the interior of the box are painted black
with a matt non-metallic paint and there is a gap of not less than 100 mm
between this assembly and the inside walls, ceiling and floor of the test
enclosure.
When luminaire is intended to be recessed into a wall, the test is
made using a test recess similar to that described above, but with the board
placed vertically.

APPENDIX E
( Clause6.3.1 )

DETERMINATION OF WINDING TEMPERATURE RISES

BY THE INCREASE IN RESISTANCE METHOD

NOTE -Reference to ballasts also applies to similar components such as

transformers.

E-1. Before commencing the test, arrangements are made by which the
ballast may be quickly connected by appropriate means of negligible resis-
tance to a Wheatstone bridge, or other suitable resistance measuring
instrument, after the luminaire has been disconnected from the supply.
E-2. A chronometer with an easily-read second hand is essential.

E-3. The test procedure is as follows.

E-%1 The luminaire remains unenergized for a period long enough to
ensure that the complete luminaire, including the ballast windings is ther-

42
 ~.___.. __.____ -- ________~
.___

IS : 10322 ( Part 4 ) - 1984

mally stable in a substantially constant ambient temperature ( tr ), which

should not change by more than 3°C during this period.

E-3.2 The resistance ( RI ) of the cold ballast winding is measured and tl

noted. The luminaire is operated until thermal stability has been achie-
ved as indicated by a suitable temperature measuring device attached to
the body of the ballast. The ambient air temperature ( ts ) in the draught-
proof enclosure is noted.
E-3.3 The luminaire is then disconnected from the supply, the time noted,
and the ballast connected immediately to the Wheatsone bridge. The
resistance is measured as quickly as possible and the corresponding time
noted.
E-3.4 Further resistance measurements, if necessary, are made at suitable
intervals whilst the ballast is cooling, the times at which the measurements
are made being recorded. These measurements enable a time/resistance
curve to be plotted which is extrapolated back to the point corresponding
to the instant of disconnection of the supply and the resistance Ra of the
hot winding is read.
Since the resistance of copper, over the range of temperatures of
ballasts, varied in direct proportion to the temperature as measured from
a reference point of -234*5”C, the hot temperature ts may be calculated
from the ratio of the hot resistance R, to the cold RI by means of the
equation:

RS ts + 234.5
--__==
RI tl + 234.5
Hence, for windings of copper wire:

t* = $ ( tl + 234.5 ) - 234.5

The temperature rise is the difference between the calculated tempe-

rature t2 and the ambient air temperature tS at the conclusion of the test,
that is:
temperature rise = ( tl - tg )“C

43
I$ : 10322 ( Pari 4 ) - 1984

APPENDIX F
I I

( Clause 6.4 )

ABNORMAL CIRCUIT CONDITIONS

F-l. The following is a list of abnormal circuit conditions which may be

applicable to a tubular fluorescent or other discharge lamp luminaire and
from which the thermally most onerous condition shall be taken
( see 6.3.1 ). If the luminaire contains more than one lamp, the abnormal
condition shall be applied only to the one lamp which leads to the most
adverse results. The abnormal condition shall be set up before the test is
started. Conditions (d) and (e) refer only to lamps with two preheated
electrodes ( for example, fluorescent lamps ). The descriptions include
instructions on test arrangements. Conveniently the abnormal circuit condi-
tion may be produced or simulated by remote switching so that it is not
necessary to disturb a luminaire which has just completed the test of
normal operation.

a) Short-circuit of starter contacts - This condition applies to starters

with moving contacts, including starters incorported in lamps.
b) Lamp rectzjication - This is a fault condition which may occur
after extended use in luminaires employing starterless ballasts,
with capacitive reactance control. Luminaires employing this
type of circuit shall be tested in accordance with the requirements
ofrelevant Indian Standard on tubular fluorescent lamps and the
circuit arrangements for this test shall be as specified in that
standard.

c) Lamps removed and not replaced.

d) One electrode of lamp oppcircuit - The condition may be pro-

duced by switching. ( Alternatively, a test lamp may be suitably
modified. ) The electrode shall be selected which more adversely
affects the results.

e) Lamp will not start but both electrodes intact. For this condition,
a non-serviceable or modified test lamp may be used.

44