Disclosure to Promote the Right To Information

Whereas the Parliament of India has set out to provide a practical regime of right to information for citizens to secure access to information under the control of public authorities, in order to promote transparency and accountability in the working of every public authority, and whereas the attached publication of the Bureau of Indian Standards is of particular interest to the public, particularly disadvantaged communities and those engaged in the pursuit of education and knowledge, the attached public safety standard is made available to promote the timely dissemination of this information in an accurate manner to the public.

इंटरनेट मानक

“!ान $ एक न' भारत का +नम-ण”Satyanarayan Gangaram Pitroda

“Invent a New India Using Knowledge”

“प0रा1 को छोड न' 5 तरफ”Jawaharlal Nehru

“Step Out From the Old to the New”

“जान1 का अ+धकार, जी1 का अ+धकार”Mazdoor Kisan Shakti Sangathan

“The Right to Information, The Right to Live”

“!ान एक ऐसा खजाना > जो कभी च0राया नहB जा सकता है”Bhartṛhari—Nītiśatakam

“Knowledge is such a treasure which cannot be stolen”

“Invent a New India Using Knowledge”

है”ह”ह

IS 8337 (1976): Performance requirements of compressionjoints of aluminium conductors in insulated cables [ETD 9:Power Cables]

Indian Standard SPECIFICATION FOR

PERFORMANCE REQUIREMENTS OF COMPRESSION JOINTS OF ALUMINIWM CONDUCTORS IN INSULATED CABLES

, , ( Second Reprint APRIL 1988 )

UDC 621.315.682:621.315.55(669.717):620.16

Gr 4

BUREAU. OF INDIAN STANDARDS MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MAR0

NEW DELHI 110002

Muy 1977

hdian Standard SPECIFICATION FOR

PERFORMANCE REQUIREMENTS OF COMPRESSION JOINTS OF ALUMINIUM CONDUCTORS IN INSULATED CABLES

Conductors and Power Cables Sectional Committee, ETDC 32

Chainaan Smu M. R. BHAT

Mnnbsrs

RsprMltiag Bombay Suburban Electric Supply Ltd, Bombay

Smr N. D. CHAWLA (Al- to Shri M. R. Bhat )

SHR~ K. K. AORAWAL l%cc;c;,te General of Posts Rr T&graphs, New

SWRI V. R. SUNDARARAJAN ( Alkmate ) Smu S. K. B1sw~ ( GUPTA ) Directzrocr General of Mines Safety (M@istTy of

Dhanbid Employment & Rchablhtatlon ),

SHRI N. K. SEN ( Alkmnte ) WC CDR l-l. S. B~~ATIA Directorate General of Technical Development &

Production ( Air ) ( Ministry of Defencc ), New Delhi

SHRI H. C. PANDB ( Afknrok ) &RI-K. V. CHAUBAL Federation of Electricity Undertakings of India,

~Bombay SRRI C. DAWUPTA Calcutta Electric Supply Corporation Ltd, Calcutta &PUTY DIRECTOR. ELE~RICAL Naval Headauarters

ENOINEERIN~ ( M;\TERIAL ) - STAFF OPPICER, ELECTRICAL

ENGINEERING ( DWWN) ( Al&mate) SERl M. DEY Indian Cable Co Ltd, Calcutta

&RI N. V. RA-IIAN ( Alternatr) MAJ R. S. DHANOTA Direccge.~Standardization, Ministry of Dcfence,

SWR~ C. M. BHAT ( Akaatc) DIRECTOR ( TRANSMISSION ) Central Electricity Authority, New Delhi

DEPUTY DIRECTOR ( TRAN~- XISSION ) ( A~WIU~O j

SERB M. L. D~NORH Bom~~;~Jctric Supply 8r Transport Undertaldng,

SHRI ALAR SINGH ( Alternab ) (Continued on page 2 )

Q Copyright 1977 BUREAU OF INDIAN STANDARDS

This publication is protected under the Indian Copyright Act (XIV of 1957) and nproduction in whole or in part by an means except with writton permission of the puhlisher shall be deemed to be an in rlnf3emeot of copyright under the said Act P.

is t a337 - 1975

“’ (Chfinuedfrom page 1 ) Members Repmentin~

SHRI V. A. KRISHNAMURTI~Y Central Public Works Department, New Delhi SURVEYOR OF WORKS 11

( ELECTRICAL ) ( Alternate ) SHRI D. R. MANOHAR Nationa 1 Insulated Cable Co of India Ltd, Calcutta

SHRI J. S. BHAN ( Altemafe ) SHRI M. N. MUKERJEE Railway Board ( Ministry of Railways )

SHRI C. A. S.ANKARANARAYANAN ( Alternate ) SHRI S. K. MUKHERJ~E National Test House, Calcutta SHRI S. N. NAYAR Aluminium Industries Ltd, Kundara

SHRI P. K. KRISHNAN NASR ( Alfcrnate ) SHRI V. G. G. NAYAR Oriental Power Cables Ltd, Kota

SHR~ V. K. CHATURVEDI (Alternate ) SHRI J. S. PASSI Directorate General of Supplies & Disposals ( Inspec-

tion Wine I. New Delhi _ ,, SHRI P. L. KAPUR ( Alfematc )

SHRX A. S. PINTO Delhi Electric Supply Undertaking, New Delhi SHRI A. K. RAMAN Asian Cables Corporation Ltd, Bombay

SHRI B. K. MUNDHRA ( Alfemale ) SHRI K. N. RAMA~WAMY Directorate Gcncral’of Technical Development, New

Del hi SHRI D. P. GUPTA (Alternate)

SHRI M. J. RAO Tata. Hydro-Electric Power Supply Co Ltd, Bombay SHRI M. V. GONDIIALEKAR (Alternate)

SHR~ S. SABAPATHY Tamil Nadu Electricity Board, Madras SHRI P. S. THIRUNAVUKKARWU

( Alternate ) SHRI L. K. SANCHI Fort Glostcr Industries Ltd, Calcutta

SHRI A. S. BHA~TACHARJEE ( A&emote ) DR P. S. SHAH Cable Corporation of India Ltd, Bombay

SHRI S. R. PADMANABBHAN ( Alternate) SrfRr S. P. SACHDEV. Director General. BIS ! Ex-officio Member )

Director ( Elec tech) . -

Secretaries Snar T. RAJARAMAN

Deputy Director ( Elcc tech ), BIS SHRI HARCHARAN SINOH

Deputy Director ( Elec tech ),BIS

Panel for Compression Joints for Aluminium and Copper Conductored Cables, ETDC 32 : P 10

Conuener

SHRI M. R. BHAT

Members

SHRI M. L. DONORB

Bombay Suburban Electric Supply Ltd, Bombay

Bom;;AtJctric Supply & Transport Undertaking,

SHRI ALTAR SINGH ( Al&mate ) SHRI A. P. MATHUR Mahindra Elcctro-chemical Products Ltd, Pune SHRr G. S. PATEL Dowell’s Elektroworke, Bombay

SHRI T. B. HUNNUR ( Alternate) SWRI A. S. PURANDARB Sicmens India-Ltd, Bombay SHR~ K. RA~~:AN Indian Splicing ( Mechanical ) & Accessories Ltd.

Calcutta

2

IS : 0337 - 1976

Indian Standard SPECIFICATION FOR

PERFORMANCE REQUIREMENTS OF COMPRESSION JOINTS OF ALUMINIUM CONDUCTORS IN INSULATED CABLES

0. FOREWORD

0.1 This Indian Standard was adopted by the Indian Standards Institution on 22 December 1976, after the draft finalized by the Conductors and pow@ Cables Sectional Committee had been approved by the Electrotechnical Division Council.

0.2 The technique of compression in jointing of electrical conductors is an alternative method to the already known methods of soldering and welding. The compression technique employs a wide variety of compressing dies and tools developed for various applications differing from one another in num- ber of crimps, shapes and extent of compression. The effects of compression are compacting of cross section of the main conductor, break-through the oxide film, and,lor its deformation which determines the ultimate effective_ ness of the joint. Because of the uncertainty with regard to the mechanic& and electrical characteristics of the compression joint, it is considered d&r- able to lay down certain specific requirements which, if fulfilled, may ensure the satisfactory performance of the joint in service. This standard -ha therefore been prepared to lay down the performance requirements. and methods of tests of compression joints which will reasonably satisfy the effectiveness of the compression technique in cable jointing.

0.3 This standard is one of the series of standards for compression joints for aluminium conductors in insulated cables. The other standards in the series are:

IS : 8308-I 976 Specification for compression type tubular in-tine connectors for aluminium conductors of insulated cables

IS : 8309-1976 Specification for compression type tubular terminal ends for aluminium conductors of insulated cables

0.4 When a connector or termination fo7ning a joint meets the require_ ments of this standard, it is expected that m service:

a) the resistance of the joint will remain stable;

b) the temperature of the joint will be of the same order as that of the conductor;

3

1s t a337 - 1976

c) if the intended use demands, application of short-circuit current will not cause undue deterioration; and

d) the mechanical strength will be adequate.

O-4.1 This standard is not fully representative of service conditions and does not cover conditions arising, for example, as a result of conductor temperature variation because such stresses depend considerably on the overall design of the installation in which the connector is used. No test is included to determine whether the performance of connectors is affected by compounds with which they might come in contact.

0.5 In preparing this standard, assistance has been derived from the following:

BS 4579 : Part 1 : 1970 Specification for the performance of compres- sion joints in electric cable and wire connectors : Part 1. Copper Conductors. British Standards Institution.

DOC : 73/288%6 DC Draft British Standard Specification for the per- fomance of mechanical and compression joints in electric cable and wire connectors : Part. . . . . Aluminium conductors. British Standards Institution.

0.6 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 : 2-1960*. The number of significant places retained in the rounded off value should be the same as that of the specified value in this standard.

1. SCOPE

1.1 This ~standard specifies the performance requirements and methods of tests for compression joints of aluminium conductors in insulated cables of rated vol;ages up to and including 11 kV.

2. TERMINOLOGY

2.0 For the purpose of this standard, the following definitions sha!l apply.

2.1 Compression Joint -A permanent connection formed by a process of fixing a terminal end, or in-line connector for branch connection, to a conductor by pressure forming or reshaping the terminal end or connector barrel around the conductor to establish a good electrical and mechanical contact. --

*Rules for rcuncling off numerical values ( reui.ccd).

4

Is : 8337 - 1976

2.2 Terminal End - A connecting device with barrel accommodating respective conductor size of electrical cable and which has a fixing arrange- ment of termination by means of a bolt fixing or pin-insertion in tunnel type terminal blocks and screwing.

2.3 In-Line Connector - A connecting device accommodating two elec- trical conductors to form straight joint.

2.4 Compression Tool -A hydraulic or mechanical device for compressing.

3. CLASSXFICATION

3.1 The connectors are classified as follows:

Type 1 -- Connectors for which short-circuit test is applicable.

Type 2 - Connectors for which short-circuit test is not applicable,

4. REQUIREMENTS

4.1 Joint Resistance

4.1.1 h&z2 Value -- The initial resistance ( A to B ) of the ( all ) specimen(s) when tested in accordance with 6.2 shall not:

a) excecdqthe resistance of a length of conductor equal to the length of the compression barrel ( dimension L ), and

b) differ by more than 50 percent or 5 pn ( whichever is greater ) from the mean of the overall rcsistanccs of the :sis specimens prepared in accordance with 5.1.

4.1.” Values Measured in the Course oJ’ Short-Circuit Test - The resistance: ( A to B ) of the ( al: ) p s ecimen(s) memurcd after anv one of the thret: applications of short-circuit current in accorclancc with 6.3 shali not exceed the initial. value by more than 50 percent or .5 pa, \\%ichcver is greater.

4.1.3 Values Meaxured CAer Electrical l-dad Cycling

4.1.3.1 The average resistance ( -4 to B ) of t.he test spccimcn taken over 1 600 cycles shall not exceed the average equivalent conductor resistance taken over the same period, by more than 50 percent or 5 PQ, whichever is greater.

Nom-The equivalent conductor resistance is the resistance of the length of the control conductor of length equal to half the ferrule length.

4.1.3.2 The average resistance ( A to B ) of the test specimen taken over 1 000 cycles shall not exceed the resistance oft he test specimen as

5

I§ : 8337 - 1976

measured immediately before the start of the electrical load cycle test, by more than 50 percent or 5 pn, whichever is greater.

4.1.3.3 The graph of resistance ( ‘4 to B ) against number of cycles shall demonstrate ~with a reasonable probability that the change ( rise or fall ) of resistance over 1 000 cycles is not more than 20 percent of the average resistance over the same period.

NOTE - If the graph of resistance is unacceptable to either purchaser or supplier, a statktical method ( under consideration ) shall be used to determine the acceptability of a connector or terminal end.

4.X.3.4 In the event of the results of the statistical test in 4.1.3.3 being considered indeterminate by either purchaser or supplier, then the test shall be extended bv periods of 1 000 load cycles and the results assessed in accordance wi’th the Note under 4.1.3.3.

4.2 Tensile Strength -- Connectors and terminal ends, when tested in accordance with the provision of 6.5 shall withstand without damage a test load of 40Njmms of the cross-sectional area of the conductor.

5. TEST SPECIMENS

5.1 Preparation -‘- Test specimens shall be made upon insulated conductors taken from any type of cable conforming to the relevant Indian Standard.

The conductor shall be prepared and the joint shall be made with the connector using the tools prescribed and in accordance with the instructions and drawings of the connector manufacturer. No subsequent tightening of the joints shall be permitted. In the case of through connectors, care shall be taken to ensure tl at rhc ends of the conductors are not in direct contact, unless the design of the connector specifically provides for butting of the conductors.

The insulation shall be retained on the conductor except as necessary to enable the connector to be assembled, and suitable potential measuring points shall be provided to enable temperature measuring devices to be placed in contact with the control conductors.

5.2 Number of Specimens - Six similar specimens shall be prepared for each type 2nd size of joint.

When a connector or terminal end has dimensions such as to enable it to accept a range of conductors, tests shall be made on six specimens of both the smallest and largest sizes of conductor in the declared range.

If a particular tvpe of connector or terminal end is meant for more than one shape of solid conductor, six specimens shall be tested for each shape of conductor.

6

ISr8337-1976

Where terminal ends for a given shape and size of conductor are available with different palm sizes, but are otherwise identical, tests shall be carried out on terminal ends with the smallest palm size only.

6. TESTS

6.0 General - Before the tests are made, it shall be ensured that the test specimens comply with 5.

6.1 Sequence of Tests -Tests on each specimen shall be made in the sequence given below:

a) Before the specimens have been assembled into the load cycling rig:

1) Initial resistance measurement ( 6.2 ),

2) Short circuit test on Type 1 connectors ( 6.3 ), and

3) Resistance measurement on Type 1 connectors ( 6.2 ).

b) After the specimens have been assembled into the load cycling rig:

1) Electrical load cycle test ( 6.4 ), and

2) Resistance measurement ( 6.2 ).

c) After completion of the load cycle test:

Tensile strength test ( 6.5 ).

6.2 Resistance Measurement - Electrical resistance measurement shall be carried out by the method of voltage drop by the use of two probes on the completed crimped joint ( see Fig. 1 ). shall not exceed 30 V de.

The maximum source voltage

direction. The current shall be passed consecutively in each

The points of voltage drop measurement of terminal ends and in-line connectors are as shown in Fig. 2. The resistance measurement shall bc carried out at a temperature of 27 f 5°C.

6 VARIABLE dc SUPPLY

30VlMAXi

Y

FIG. 1 ELECTRICAL RESISTANCE MEASIREMENT

7

IS : 8337 - 1976

SPECIMEN RESISTANCE --____

FREE CONDUCTOR -- RESISTANCE -4

ZA Terminal Ends

A SPECIMEN RESISlANCE

0

2B In-line Connectors

Fxo. 2 Poxprrs FOR T’OLTAGF, DROP MEASUREMENT

The joint resistance shall be regarded as that determined by subtract- ing from the specimen resistance, the resistance of the fret length of conductor between the joints and then dividing the result by two.

This test shall also be carried out at approximately every 100 cycles during the course of 1 000 cycles .of the electrical load cycle test ( see 6.4 ) .

The initial value of resistance of joint before electrical load cycle shall not exceed the resistance of a length of the conductor equal to length of the compression barrel.

6.3 Short-Circuit Test -- Under consideration.

6.4 Electrical Load Cycle Test

-6.4.1 Testing Conditionr

test the

6.4.1.1 General --- The tests shall be carried out in reasonable draught- free conditions. The test loop shall be erected so that the distance between connectors or terminal ends or any other connections introduced to facihtat.c testing shall be suffkient to ensure negligible thermal interference.

Each connector or pair of terminal ends shall be supported in such a way that air may freely circulate around the assembly to provide cooling by natural convection.

8

IS:833701976

If a connector is such that two sizes of conductor are being connected into the main loop the smaller of the two shall be used as the control conductor.

6.4.1.2 Through connectors and terminal ends - Typical arrangements of the test loop are shown in Fig. 3. It shall contain a length of unjointed conductor, of not less than l-2 m, the control part of which shall be used as the control for temperature and resistance measurements.

3A In-line Connectors

3B Terminal Ends

1 - Contactor and timing device for automatic control

2 - Variable transformer

3 - Transformer

4 - Control conductor

a - Connector or terminal end under test

b - Reliable connections for test purposes ( form optional )

FIG. 3 TYPICAL TEST CIRCUIT FOR ELECTRICAL LOAD CYCLE TEST

Where terminal ends are to be tested, the terminal ends shall be fitted to each end of the unjointed conductor. Only terminal ends of the same size and make shall be bolted together. Linking bars may be used provided that the temperature of the terminal end does not differ by more than 5°C from the temperature attained when the terminals are bolted palm to palm.

6.4.2 Test Procedure -The test shall be carried out on six specimens prepared in accordance with 5.1. After the samples have been assembled

9

Is t 8337 - 1976

into the test loop, but prior to load cycling, the resistance across each connector and terminal end shall be measured as specified in 6.2.

The load cycle test is to be carried out for 1 000 cycles of which three intermediate additional heating cycles after 500, 700, 900 cycles shall be performed as specified in 6.4.2.1.

The test current shall be so adjusted that the control conductor raised to a final temperature of 100°C in 20 minutes. This current shall be evaluated by a preliminary experiment. After the samples have attained this temperature, the current shall be switched off and the conductor and the joints shall be cooled to at lcast 4U’C in 20 minutes. The above schedule will comprise one load cycle.

During load cycling, the temperature of the control conductor shall be measured with an indicating or recording instrument every 40 minutes for the upper and lower temperature limits; necessary adjustment in the heating current being permitted to compensate for any change in the ambient temperature.

At the end of approximately 100 cycles, the current shall be switched off and the test loop allowed to cool until the connectors have acquired the temperature of their surroundings. Resistance measurements as specified in~6.2 shall be made.

6.4.2.1 Intermediate additional heating cycles - These are to be performed after 500, 700, 900 heating cycles. After each of these number of load cycles, sufficient current should be passed through the samples to heat them to 200°C in 5 minutes. The tcmpcrature shall be maintained by adjust- ment of the current for a duration of 5 seconds. The specimens shall then be cooled to the lower temperature limit of 40°C. Joint resistance shall be measured.

This test shall be repeated at the end of 700 and 900 load cycles.

6.4.3 Presentation of Results - The results of the tests shall be presented graphically in the form shown in Fig. 4 and 5; the scales of the graphs being chosen to show clcar!y any significant changes of resistance or temperature.

6.5 Tensile Strength Test

6.5.1 This test is carried out on all types of connectors and terminal ends. The test shall be carried out in 6 of the 12 specimens subjected to electrical load cycle test. The test specimens shall be inserted in the jaws of the tensile testing machine in such a manner as to ensure that the load is applied directly along the axis of the conductor in the case of bolted in-line connectors and terminal ends. The body of the in-line connector or terminal end should not be gripped by the jaws of the tensile testing machine. The axial pull shall be applied by separating the jaws of the tensile testing machine at a

10

IS : 3337 - 1976

steady rate between 25 and 50 mm/kin. to failure.

The test specimen shall be tested

6.5.2 Criteria of Failure - The joint ( in-line connector or terminal end ) shall be judged to have failed when the conductor starts slipping out of the in-line connector or terminal end, The load at which klipping or yield of the conductor commences is directly indicated by the load-reading dial of the tensile testing machine.

Nom - This load reading remains fixed at the value at which the conductor start, slipping out~of the barrel and can be recorded. It does not depend on the amount of slip from the barrel as, though the conductor continues to slip from the barrel after the joint has failed, yet the load remains at the value recorded at the commencement of the slip.

7. MATHEMATICAL ACCEPTANCE CRITERION OF COMPRESSION JOINTS

7.1 The mathematical acceptance method is under consideration. Typical graphs of resistance versus load cycles for two specimens shown as A and B are given in Fig. 6 and 7 for itiormation.

i, 160 260 360 660

NUMBER OF CYCLES

Fro. 4 GRAPH OF TEMPERATURE nersus (ELECTRICAL LOAD CYCLE

11

760 860 960 do0

NUMBER OF C~cms TEST )

IS:833701976

NUMBER OF CYCLES

Fm. 5 GRAPH OF RESISTANCE versus NUMBER OF CYCLES ( ELECTRICAL LOAD CYCLE TEST )

CHANGE OF RESISTANCE .OVER

-5 -‘ -3 -2 -1 0 I 2 3 ‘ 5

M - Change of resistance

R - Mean resistance

Fm. 6 GRAPH OF RESISTANCE WYW LOAD CYCLES ( AccEpTANcE CRITERION FOR SPECIMEN A)

12

IS : 8337 0 1976

CWANGE OF RESISTANCE OVER

500 CYCLES CALCULATED

M = Change of resistance

ii = Mean resistance

S = Scatter of resistance values abcut line of best fit

D=M+S

FIG. 7 GRAPH OF RESISTANCE UYSUS LOAD CYCLES ( ACCEPTANCE CRITERION FOR SPECIMEN I3 )

8. TEST REPORTS

8.1 Test reports shall include the particulars required in Appendix A together with any other relevant information.

8.2 The results of each measurement called for in the sequence of tests set out in 6.1 shall be recorded together with the date when the joints were made; the date of making tests; and in the case of rcsistancc measurements, the ambient tcmpcraturc.

8.3 The results of tests shall be presented graphically as shown in Fig. 4, 5, ~6 and 7.

NOTE - Fig. 6 and 7 will be used for acceptability, only after the statistical method is specified.

13

A-l.1 The principal details of the connector or terminal end should be by reference or otherwise, including the following: recorded,

4 b) 4

4

Manufacturer;

Catalogue or reference number;

Type of connector ( for example, straight through, terminal end etc);

4

Principal dimensions ( or reference to any drawings as necessary) and sufficient details of system and tooling used to avoid ambiguity;

Conductor(s) for which suitable ( including tolerance on conductor size, if applicable ):

cs : 8337-o 1976

APPEND-IX A ( Clause 8.1 )

SCHEDULE OF TECHNICAL INFORMATION

A-I. DETAILS TO BE IRECORDED

I Conductor Maximum Minimum Shape

.-

Main

Branch or service ( if relevant )

f 1 !d hj .ij

W

4

Method of connection ( for example, compression );

Material specifications;

Surface finish, if any;

Type of cable from which test conductor is taken, namely: I) size, 2) manufacturer, and 3) compound, if any ( for example, AUflfI, etc j ; Statement as to any compound used as part of the jointing system; and

Statement as to the essentials of the method of assembly of the samples, for example, whether, to what extent and by what means conductors and connectors were cleaned, date of assembly, etc.

14

BUKEAU OF INDIAN STANDARDS

Headquarters :

Manak Bhavan. 9 Bahadur Shah Zafar Marg, NEW DELHI 110002

Telephones : 3 31 01 31,3 31 13 75 Telegrams : Manaksanstha

( Common to all Offices ) Regional Offices : Telephone

*Western ; Manakalaya, E9 MIDC, Marol. Andheri ( East ), 6 32 92 95 BOMBAY 400093

tEastern : l/14 C. I. T. Scheme VII M, V. I. P Road, Maniktoia, CALCUTTA 700054

Northern : SC0 445-446, Sector 35-C CHANDIGARH 160036

Southern : C. I. T. Campus, MADRAS 600113

Branch Offices :

36 24 99

{ z::::

J 41 24 42 41 25 19

141 29 16

Pushpak,’ Nurmohamed Shaikh Marg, Khanpur, AHMADABAD 380001

‘F’ Block, Unity Bldg, Narasimharaja Square, BANGALORE 560002

{ 2 63 48 2 63 49

22 48 05

Gangotri Complex, 5th Floor, Bhadbhada Road, T. T. Nagar, 6 27 16

BHQPAL 462003

Plot NO. 82/83, Lewis Road, BHUBANESHWAR 751002 5 36 27 5215 Ward No. 29. R. G. Barua Road,

5th Byelane. GUWAHATI 781003 -

5-8-56C L. N. Gupta Marg. (Nampally Station Road), 22 10 83 HYDERABAD 500001

R14 Yudhister Marg, C Scheme, JAIPUR 302005

{ 6 34 71 6 98 32

117/418B Sarvodaya Nagar, KANPUR 208005

Patliputra Industrial Estate. PATNA 800013 Hantex Bldg ( 2nd Floor ), Rly Station Road,

TRIVANDRUM 695001

21 68 76 21 82 92

6 23 05 52 27

inspection Office ( With Sale Point ):

Institution of Engineers PUNE 410005

India 1 Building, 1332 Shivaji Nagar, 5 24 35

*Sales Office in Bombay is at Novelty Chambers, Grant Road, 89 66 -Bombay 400007

28

tSales Office in Calcutta is at 6 Strew. Calcutta 700072

Chowringhee bproach, P. 0. Princep 27 68 00

Reprography Unit, BIS, New Delhi, India

AMENDMENT NO. 1 SEPTEMBER

TO

1980

IS : 8337-1976 SPECIFICATION FOR PERFORMANCE REQUIREMENTS OF

COtiPRESSION JOINTS OF ALUMINIUM COiDUCTORS IN INSULATED CABLES

Alteration

( Pages 5 and 6, clauses 4.1.1 to 4.X.3.3 ) - Substitute the following tbr the existing clauses:

4.1.1 Initial Value - The initial value of joint resistance ( JCC Note ) of the ( all ) specimen(t) when tested in accordance with 6.2 shall not:

a) exceed the resistance of a length of conductor equal to the )cn@h of the compression barrel ( dimension L ), and

b) differ by more than 50 percent or 5 micro-ohm ( whichever is greater ) from the mean of The initial joint resistance values of the six specimens prepared in accordance with Xl.

NOTS -Joint resistance ( m Fig. 2 )

~ Specimen resistance AB - Free conductor resistance

2

4.1.2 Valurs Mearured in fhe COUSC of sh0~1-Ci~d 7tsf - The joint

resistance ofthe ( all ) specimen(s) mcasurcd after any one of the three applications. of short-circuit current in accdrdance with 6.3 shall not exceed the initial joint resistance values by more than ‘0 pcrccnt or 5 micro-ohm, whichever is greater.

~1.3 Values Mtosurrd after Electrical Load Cycling

,4.1.3.1 The average of six final values of joint resistance of the test specimen taken over 1 COO CYCICS shall not exceed the average rquivalent conductor resistance taken over the same period by more than 50 percent or 5 micro-ohms, whichever is grcatcr.

Nom - The cquiralcnt conductor rcsirtrncr ir the reristance of the length of the control conductor of length equal to half the ferrule length ( which ir marketi 2L in Fig. 2 ).

4.1.3.2 The average of six final values of joint resistance of the test specimen taken over 1000 load CYC~CS shall not exceed the resistance of the test specimen as measured immediately bcforc the start of the electrical load cycle test, by more than $0 percent or 5 micro-ohms, whichever is greater.

1

k-

4.1.3.3 The graph of joint resistance against number of load cycles shall demonstrate with a reasonable probability that the change ( rise or faJJ ) ofthc resistance over 1000 cycles is not more than 20 percent of the average resistance over the same period.

NOTE - If the graph of resistance b unacceptable to tither purchaser or supplier, a statistical method ( under consideration ) shall be used to determine the acccpt- ability of a connector or terminal end.’

(El-DC 59)

2

Reprography Unit, BIS, New Delhi, India