IS 10810-64: Methods of Test for Cables, Part 64: Measurement of Temperature Index

8 Pages·2003·0.94 MB·English

by  Bureau of Indian Standards

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IS 10810-64 (2003): Methods of Test for Cables, Part 64:
Measurement of Temperature Index [ETD 9: Power Cables]
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IS 10810 (Part 64) :2003
W’?im Jmm
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‘WIT 64
Indian Standard
METHODS OF TEST FOR CABLES
PART 64 MEASUREMENT OF TEMPERATURE INDEX
ICS 19.080:29.060.20

0 BIS 2003
BUREAU OF INDIAN STANDARDS
MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG
NEW DELHI 110002

October 2003 Price Group 1
Power Cables Sectional Committee, ET 09
FOREWORD
This Indian Standard (Part 64) was adopted by the Bureau of Indian Standards, after the draft finalized by the
Power Cables Sectional Committee had been approved by the Electrotechnical Division Council.
This standard specifies the test method for measurement of temperature index of insulation or sheath of electric
cables. This method is limited to physically self-supporting test specimens.
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 or analysis, shall be rounded off in accordance with
[S 2: [960 ‘Rules for rounding off numerical va]ues (?’evi$ed)’. The number of significant places retained in
the rounded off value should be the same as that of the specified value in this standard.
IS 10810 (Part 64): 2003
Indian Standard
METHODS OF TEST FOR CABLES
PART 64 MEASUREMENT OF TEMPERATURE INDEX
1SCOPE index. Conditioning at27 * 2°C and 50 + 5percent relative
humidity foraminimum period of40 hisrecommended where
This test method is applicable for testing the amaterial issuspectedtobeaffected bytberetained moisture.
temperature index of insulation or sheath of electric
6.3 The specimens may be obtained by moulding,
cables and is limited to physically self-supporting test
cutting or machining fium those cable constituents to
specimens.
be tested. Where this is not possible with a cable
2SIGNIFICANCE containing vulcanized material, a moulded and
vulcanized slabprepared horn material sampled during
Oxygen index isthe most widely used tire parameter
manufactureofthesameproductionbatchshallbeused.
inthe assessment of materials. However, the burning
is significantly influenced by the actual temperature 6.4 The edges of the test pieces shall be smooth and
involved. The temperature index helps inassessment free from fuse orburrs ofmaterial from machining or
ofthematerialpropertiesunderheatandfm. Itexplores peripheral flash from moulding.
thetemperature atwhichtheoxygen indexofamaterial
7PROCEDURE
becomes 21.
7.1 Place the thermocouple near the bottom to verify
3 REFERENCE
pre-heating air temperature and then position it near
The following standard is a necessary adjunct to this the top to determine the chimney temperature. Its
standard: position should besuch, soasto avoid turbulence and
shall not be subjected to heat from the -burning
IS No. Title
specimen.
10810 (Part 58) : Method of test for cables: Part 58
7.2 Record the ambient temperature. Adjust the gas
1998 Oxygen index test
flow in the chimney to 4 + 1 cm/s as calculated at
4TERMINOLOGY standard temperature (O”C)and pressure (101.3 kPa)
fromthetotal flowofgasinmm3/sdivided bythe area
4.1 Temperature Index ofthe column inmmz.
The temperature index is the temperature in ‘C at
7.3 Whenthetemperatureisstable,clampthespecimen
which theoxygen index of amaterial becomes 21(the
vertically by any small holding device, at its base in

approximate percentage of oxygen in air) under the
the approximate centre of the column with the top of

conditions ofthe test.
thespecimenatleast 100mmbelowthetop oftheopen
column. Re-adjust thethermocouple soasnottotouch
5APPARATUS
thespecimen andbeapproximately 25mm away from
Thetestapparatus issameasrecommended foroxygen thecenterline ofthe specimen.
index test in IS 10810 (Part 58) with appropriate
heating system. 7.4 Remove the thermocouple after the temperature
has re-established (usually within 10 rein) and
6TEST SPECIMENS determine the oxygen index of material at this
temperature asper IS 10810(Part 58).
6.1 Three test specimens of flat rectangular sheets
having the following dimensions: 7.5 Take the first reading at ambient temperature and
Width : 6.5 +0.5 mm continue repeating 7.1 to 7.3, however, raising the
temperature in 7.2 by 20°C (maximum) for two
Thickness : 3.0* 0.5 mm
successive determinations of values, for a total of
Length : 70to 150mm minimum three different temperatures (including the
readingatambienttemperature). Thetemperature index
NOTE — [ncaseofflexible material, thethicknessofspecimen
can be2.0 + 0.25 mm instead of3.O + 0.5 mm. shallbedetermined byextrapolation ofthis data.
6,2 Test the specimen in the condition as received 7.6 Plot values of oxygen index against temperature
unless otherwise agreed upon. using linear graph paper and read off the value of
NOTE — Moisture .contentofsomematerials affecttheoxygen temperature atwhich the oxygen index is21.

1
[S 10810 (Part 64):2003
8 TABULATION OF OBSERVATION
S1No. Test Temperature Volumetric Flow Rate mmsls Specimen Burns
Oxygen Nitrogen Air Duration 250 mm
(rein) (Yes/No)
9 CALCULATION Material under test .....................................................
The minimum temperature index isthetemperature at Ambient temperature .................................................
which the oxygen index is 21 read off in graph as
Specified temperature index ......................................
per 7.6.
Observed temperature index ......................................
10 REPORT
10.2Conclusion
10.1 Measurement of Temperature Index
Specimen meets/does not meet the specification
Reference specification ----------------------------------- requirements.
Bureau of Indian Standards
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Review of Indian Standards
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‘BIS Catalogue’ and’ Standards: Monthly Additions’.
This Indian Standard has been developed from Dot: No. ET 09 (5184).
Amendments Issued Since Publication
Amend No. Dateof Issue Text Affected
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