Is 3961-3 Recommended Current Ratings for Cables Part 3 Rubber Insulated Cables

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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.

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“Knowledge is such a treasure which cannot be stolen”

IS 3961-3 (1968): Recommended current ratings for cables,

Part 3: Rubber insulated cables [ETD 9: Power Cables]







IS : 3961 (Part III) - l968(Reaffirmed 1996)

Indian Standard

RECOMMENDED CURRENT RATINGS FORCABLES

PART III RUBBER INSULATED CABLES

(Ninth Reprint AUGUST 1997)

UDC 62 1.31 5.21 :621 .315 .616

©Copyright 1968

BURE AU OF IND IAN STA NDA RD SMANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG

NEW DELHI 110002

Gr3 November 1968



AMENDMENT NO. 1 SEPTEMBER 1983

TO

1 S : 3 9 6 1 ( P a r t 3 ) - 1 9 6 8 RECOMMENDED CURRENT

RATINGS FOR CABLES

PART 3 RUBBER INSULATED CABLES

A l t e r a t i o n

[Page 5, clause 3.1, entry(b), under second col.]Substitute 'Clipped direct and unenclosed' for

'Clipped direct and enclosed'.

(ETDC 59)

Peprint at Printograph, New Delhi, Ph : 5726847



IS : 3961 (Part III) - l968

Indian Standard

RECOMMENDED CURRENT RATINGS FORCABLES


Conductors and Cables Sectional Committee, ETDC 32

Chairman

SHRI K. MATTHAN

Members

SHRI S. D. BANA

SHRI J. H. PATEL ( Alternate)SHRI P. K. BHARUCHA

SHRI A. C. MODY ( Alternate)SHRI M. R. BHAT

SHRI B. C AMIN ( Alternate)WG CD R H. S. BHATIA

Ripresenting

Tata-Ebasco Consulting Engineering Service*, Bombay

Gujarat Electricity Board, Baroda

Insurance Association of India, Bombay

Bombay Suburban Electric Supply Ltd, Bombay

Directorate of Technical Development & Product ion(Air)

Fo O F F R S. V. BASARKAR ( Alternate)SRRI D. P. BHATIA

SHRI P. L. KAPUR ( Alternate)SHRI S. K. BHATTACHABYA

SURVEYOR OF WORKS II

(ELECTRICAL) ( Alternate)

SHRI H. K. BHATTACHARJEE

SHRI N. K. SEN ( Alternate)SHRI N. N. CHAKRABORTI

SHRI K. V. CHAUBAL

SHRI M. L. DONGRE

SHRI AVTAR SINGH ( Alternate)CDR N. G. FADNAVIS

SHRI HARNAM SINGH

SHRI S. K. M A N I ( Alternate)SHRI A. K. KAHALI

SHRI N. V. RAMAN ( Alternate)SHRI S. K. KANJILAL

SHRI S. T. UDESHIR ( Alternate)

Directorate General of Supplies & Disposals (Inspec-

tion Wi ng) (Ministry of Works, Housing &Supply)

Central Public Works Department

Directorate General of Mines Safety (Ministry ofLabour, Employment & Rehabilitation)

Electrical Inspector to the Government of WestBengal, Calcutta

Federation of Electricity Undertakings of India.Bombay

Bombay Electric Supply & Transport Un de rt ak in gBombay

Naval HeadquartersDirectorate of Standardization (Ministry of Defence)

Indian Cable Co Ltd, Calcutta

Railway Board (Ministry of Railways)

(Continued on page 2)

BUREA U OF INDIAN STANDARDSMANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG

NEW DELHI 110002



IS : 3961 (Part III) - l968

(Continued on page 1)

Members

SHRI D.M. LAM

Divisional Engineer Tele-

GRAPHS (C) ( Alternate)SHRI M. R. LODH

Representing

Indian Posts & Telegraphs Department (Ministry ofTransport and Communications)

Devidayal Cable Industries Ltd, BombaySHRI KAMAL AGGARWAL ( Alternate)

SHRI O. P. MATHURSHRI A. K. MITRA

SHRI P. S. SRINIVASA MODALIAR

Electrical Manufacturing Co Ltd, CalcuttaCalcutta Electric Supply Corporation Ltd, CalcuttaRadio & Electricals Manufacturing Co Ltd. Bangalore

SHR I V. R. CHANDER SHRI

SHBI S. N. MUIHUI National Tot House, CalcuttaSHRI B. K. MURHKRJRR ( Alternate)

SHRI P. MUKUNDAN

SHRI R. SRN ( Alternate)SHRI H. V. NARAYANA RAO

Hindustan Cables Ltd, Rupnarainpur

Central Water & Power Commission (Power Wing)SHRI S. S. MURTHY ( Alternate)

SHRI S. PEER MOHAMMADSHRI P. M. JOSEPH ( Alternate)

SHRI S. R. C. POTISHRI K. S.JOSHI ( Alternate)

SHRI B. H. RAISHRI J. S. BHAN ( Alternate)

SHRI A. K. RAMANSHRI P. K. SANKARANARA-

YANAN ( Alternate)SHRI M. J. RAO

Aluminium Industries Ltd, Kundara

Oriental Power Gables Ltd, Kota

National Insulated Cable Co of India Ltd, Calcutta

Asian Cables Corporation Ltd, Bombay

Tata Hydro-Electric Power Supply Co Ltd, BombaySHRI M. V. GONDHALEKAR ( Alternate)SHRI G. P. SAXENA

SHRI L. K. SINGHI ( Alternate)DR P. S. SHAHSHRI K. SRIKIVASA RAO

SHRI A. SUBRAMANIAM

Fort Gloster Industries Ltd, Calcutta

Cable Corporation of India Ltd, BombayDirectorate General of Technical Development

(Ministry of Works, Housing & Supply)Madras State Electricity Board, Madras

SHRI A. T. SRESHTA ( Alternate)SHRI L. R. SUBRAMANYAM Henley Cables (India) Ltd, Poona

SHRI K. V. RAMA RAO ( Alternate)SHRI Y. S. VENKATSEWARAN,

Director (Elec tech) (Secretary)Director General, ISI ( Ex-officio Member )

Panel for Current Ratings of the Different

Types of Cables, ETDC 32: P5

Members

SHRI P. M.Joseph Aluminium Industries Ltd, KundaraSHRI S. KRISHNAMOORTHY ( Alternate)

SHRI H. V. NARAYANA RAO Central Water & Power Commission (Power Wing)SHRI S. S. MURTHY ( Alternate)

SHRI N. V. RAMANSHRI M. DEV ( Alternate)

SHRI P. K. SANKARANARAYANANDR P. S. SHAH

Indian Cable Co Ltd, Calcutta

Asian Cables Corporation Ltd, BombayCable Corporation of India Ltd, Bombay



IS : 3961 (Part III) - l968

I ndian Standard

RECOMMENDED CURRENT RATINGS FOR

CABLES


0 . F O R E W O R D

0.1 This Indian Standard (Part I I I ) was adopted by the Indian StandardsInstitution on 16 July 1968, after the draft finalized by the Conductors andCables Sectional Committee had been approved by the ElectrotechnicalDivision Council.

0.2 This standard has been drawn up to provide to the users generalguidance for loading of cables. The overloading of cables will reduce thelife expectancy of the cable and at the same time underloading it will meanuneconomic utilization of its capacity. Depending upon the loading cyclemet with in practice, the installation engineer may decide the economicloading of cables.

0.3 The permissible current ratings have been specified for three commonlyadopted conditions of installation, namely, bunched and enclosed, clippeddirect and un-enclosed and other defined conditions.

0.4 The rating factors specified in 4 shall be used to modify the currentratings in respect of ambient temperature and grouping.

0.5 This standard is being issued in a number of parts covering different

types of cables. Other part i published so far are:IS:3961 (Part IU1967 Recommended current ratings for cablet:

Part I Paper-insulated lead-sheathed cable:

IS:3961 (Part II)-1 967 Recommended current ratings for cablet:Part II PVC-insulated and PVC sheathed heavy duty cables

IS:3961 (Part IV)-1968 Recommended current ratings for cables:Part IV Polythene insulated cables

IS:3961 (Part V)-1968 Recommended current ratings for cables:Part V PVC-insulated light duty cables and wires

0.6 In preparing this standard, assistance has been derived from IEERegulations for the Electrical Equipment of Buildings of Institution of theElectrical Engineers, U. K.

3



IS : 3961 (Part III) - l968

0.7 For the purpose of deciding whether a particular requirement of thisstandard is complied with, the final value, observed or calculated, express*ing 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 shouldbe the same as that of the specified value in this standard.

1. SCOPE

1.1 This standard (Part I I I ) covers recommended current ratings for boththe copper conductored as well as aluminium conductored rubber insulatedcables of voltage ratings 250/440 volts and 650/1100 volts covered by

IS: 434 (Part I) -1964† and IS: 434 (Part II) - 1964‡ respectively.2. BASIC ASSUMPTIONS

2.1 The current ratings given in Tables 1 and 2 of the standard are basedon the following assumptions:

a)

b)

Ambient air temperature

Maximum conductor temperature

40°C

60°C

3. METHOD OF INSTALLATION

3.1 The current ratings given in this standard are for the methods of installation as given in the following table:

Type of Cable

Single-core cables

Type of Installation

a) Bunched and enclosed

b) Clipped direct andun-enclosed

c) Defined conditions

a)

b)

a)

b)

a)

Method of Installation

2 cables, single-phase

ac or dc

3 or 4 cables, three-phase ac

2 cables, single-phaseac or dc

3 or 4 cables, three-

phase ac

Flat or vertical (2cables, single-phase acor dc, or 3 or 4 cables,three-phase)

*Rules for rounding off numerical values (revised ).

†Sperification for rubber insulated cables: Part I With copper conductors (temmi).‡Specification for rubber insulated cables Part II With aluminium conductors

(revised ).

4



IS : 3961 (Part III) - l968

Type of Cable

Twin and multi-core

cablesa)

b)

c)

Type of Installation

Enclosed in a conduit

or trunking

Clipped direct andenclosed

Defined conditions

b)

a)

b)

a)

b)

c)

d)

a)

b)

Method of Installation

Trefoil (3 cables,

three-phase)One-flat twin cable,single-phase ac or dcOne-flat three-corecable, three-phase

One-flat twin cable,single-phase ac or dc

One-flat three-corecable, three-phase

One-circular twin

cable, single-phase acor dcOne-circular three- orfour-core cable, three-phase

One-circular twin

cable, single-phase acor dcOne-circular three-

core cable, three-phase

4. RATING FACTORS

4.1 For Variation in Ambient Temperature — The current ratings forcables given in Tables 1 and 2 are based on an ambient air temperature of40°C. Where the ambient air temperature differs .from this value, theappropriate rating factor given below shall be applied:

Ambient Temperature°C

25

30

35

45

50

55

Rating Factor

1.32

1.22

1.12

0.86

0.71

0.50

4.2 For Groups — The current ratings given in Tables 1 and 2 are for

tingle circuits only. For groups, the appropriate rating factor given in 4.2.1shall be applied.

5



IS : 3961 (Part III) - l968

4.2.1 For groups of cables* (o r circuits†) un-enclosed, the single-circuitratings apply provided that:

a) the horizontal clearance between cables* (or circuits†) is:1) For Single-Core Cables

i)

ii)

not less than 6 times the overall diameter of an individual

cable, and

not less than the overall width of an individual circuit, exceptthat the horizontal clearance need not in any case exceed150 mm.

2) For Twin and Multi-core Cables

not less than b times the overall diameter of an individual

cable except that the horizontal clearance need not in any caseexceed 150 mm.

b)

c)

the vertical clearance between cables* (or circuits!) is not lessthan 150 mm; and

if the number of cables* (or circuits†) exceed 4, they are installedin a horizontal plane.

In all other cases, unless a more precise evaluation of current rating hasbeen made , based on experimental work or calculated data, the followingfactors are applicable:

Rating Factor for Number of Cables* (or Circuits†) [Pair ofcables in single-phase ac or dc; 3 cables per circuit or 4 cables(three-phase + 1 neutral) per circuit ]

Single-core cable

Twin and multi-core cablet

20.80

0.80

30.69

0.70

40.62

0.65

50.59

0.60

60.55

0.57

80.51

0.53

100.48

0.48

120.43

0.45

140.41

0.43

16‡0.39

0.41

18‡0.38

0.39

20‡0.36

0.38

5. DEFINED CONDITIONS

5.1 The current ratings in the columns of the tables headed ' defined condi

tions' apply to cables run under the conditions defined below.5.1.1 Single-Core Cables

5.1.1.1 Two or three single-core cables are installed one above theother, fixed to the vertical surface of a wall or open cable trench as follows,the distance between the wall and the surface of the cable being 25 mm ineach instance:

a) Cables in which the conductor cross-sectional area does not exceed185 mm

2 are installed at a distance between centres of twice the

overall diameter of the cable,

*For twin and multi-core cables.†For single-core cables,‡In case of single-core cables, not applicable to three-phase.

6



IS : 3961 (Part III) - l968

b)

c )

Cables in which the conductor cross-sectional area exceeds 185 mm2

are installed at a distance between centres of 90 mm, and

The ratings for two cables may be applied with safety in instances

where such cables are installed in horizontal formation on bracketsfixed to a wall, either spaced as indicated above, or touchingthroughout.

5.1.1.2 Three single-core cables are installed in trefoil formation, fixedto the vertical surface of a wall or open cable trench, the cables touchingthroughout and the distance between the wall and the surface of the nearestcable being 25 mm; or alternatively, three single-core cables are installedin a trefoil formation and laid on a non-metallic floor, the cables touchingeach other and the floor throughout.

The ratings given apply provided that the sheaths of single-core metal-sheathed cables are electrically bonded at each end of the run.

The cables are assumed to be remote from iron, steel, or ferro-concreteother than the cable supports.

5.1.2 Multi-care Cables — Gables of all types other than single-core cablesare installed singly fixed to the vertical surface of a wall or open cabletrench, the distance between the surface of the cable and the wall being25 mm in every instance.

For cables spaced by distances less than those described above, thecurrent ratings in the columns headed ' clipped direct' to a surface shouldbe applied.

7



IS : 3961 (Part III) - 1968

T A B L E 1

C U R R E

N T R A T I N G S F O R

S I N G L E - C I R C U I T S I N G L E - C O R E R U B B E R

I N S U L A T

E D S H E A T H E D

O R

U N S H E

A T H E D

U N A R M O U R E D

C A B L E S A C C O R D I N G

T O

I S : 4 3 4 ( P a r t s I &

I I ) - 1 9 6 4

( C l a u s e s 2 . 1 , 4 . 1 a n d

4 . 2 )

N O M I N A L

A R E A

O F

C O N D U C T O R

( 1 )

m m

2 1 1 . 5 2 . 5 4 6 1 0 1 6 2

5 3 5 5 0 7 0 9 5 1 2 0 1 5 0 1 8 5 2 2 5 2 4 0 3 0 0 4 0 0 5 0 0 6 2 5

B U N C

H E D

A N D

E N C L O S E D

2 C a b l e s , S i n g l e -

P h a s e

a c o r d c

C u

( 2 )

A 1 1 1 4 1 8 2

4 3 1 4 2 5 7 7 3 8 8 1 0 8 1 3 3 1 6 4 1 9 0

— — — — — — — —

A l

( 3 )

A 8 1 1 1 4 1

9 2 4 3 2 4

5 5 6 6 9 8 4 1 0 3 1 2 7 1 4 7

— — — — — — — —

3 o r 4 C a b l e s ,

T h r e e - P h a s e a c

C u

( 4 ) A

9 1 2 1 5 2 1 2 5 3 6 4 9 6 2 7 5 9 3 1 1 4 1 3 9 1 6 1

— — — — — — — —

A l

( 5 )

A 7 9 1 2 1

6 2 0 2 8 3 8 4 8 5 8 7 2 8

8 1 0 8 1 2 5

— — — — — — — —

C L I P P E D

D I R E

C T

A N D

U N - E N C L O S E D

2 C a b l e s , S i

n g l e -

P h a s e a c o r d c

C u

( 6 )

A 1 3 1 7 2 2 2 9 3 7 5 1 6

8 8 8 1 0 7 1 3 1 1 6 1 1 9 6 2 2 4 2 5 7 2 9 3 3 3 1 3 4 4 4 0 0 4 8 8 5 7 0 6 5 5

A

l

(

7 ) A 1 0 1 3 1 7 2 2 2

8 3 9 5 3 6 8 8 3

1

0 2 1 2 4 1 5 2

1

7 4

1

9 9

2

2 7

2

5 7

2

6 6

3

1 0

3

7 8

4

4 2

5

0 7

3 o r 4 C a b l e s ,

T h r e e - P h a s e a c

C u

( 8 ) A 1 1 1

5 2 0 2 7 3 4 4 6 6 2 7 9 9 6 1 1 8 1 4 3 1 7 6 2 0 3 2 3 0 2 6 4 2 9 7 3 1 0 3 6 0 4 3 8 5 1 3 5 9 1

A l

( 9 ) A 9 1 2 1 5 2 1 2

6 3 6 4 8 6 1 7 5 9 1 1 1

1 1 3 7 1 5 7 1 7 9 2 0 5 2 3 0 2 4 0 2 7 9 3 3 9 3 9 8 4 5 8

D E F I N E D

C O N D I

T I O N S [ F L A T

O R

V E R T I C A L

( 2

C A B L E S ) , S I N G L E

-

P H A S E

a c O R d c

,

O R 3 O R 4 C A B L E S

,

T H R E E - P H A S E ]

C u ( 1 0 )

A — — — — — — — — — 1 3 8 1 7 3 2 1 8 2 5 5 2 9 4 3 3 7 3 8 5 4 0 1 4 7 9 5 7 5 6 5 6 7 4 6

( A l

1 1 )

A — — — — — — — — — 1 0 7 1 3 4 1 6 9 1 9 7 2 2 8 2 6 2 2 9 9 3 1 1 3 7 2 4 4 5 5 0 9 5 7 8

T R E I L

T H R E E -

P H A S E

I

C u ( 1 2 )

A — — — — — — — — — 1 2 5 1 5 3 1 8 9 2 2 0 2 5 3 2 9 0 3 2 8 3 4 2 4 0 5 4 8 3 5 6 1 6 3 1

A l

( 1 3 )

A _ — — — — 9 7 1 1 9 1 4 7 1 7 0 1 9 6 2 2 4 2 5 4 2 6 5 3 1 4 3 7 8 4 3 5 4 8 9

8



IS : 3961 (Part III). 1968

T A B L E 2

C U R R

E N T R A T I N G S F O R S I N G L E - C I R C U

I T T W I N

A N D

M U L T I - C O R E R U B B

E R I N S U L A T E D

S H E A T H E D

O R

U N S H E A T H E D

U N A R M O U R E D

C A B

L E S A C C O R D I N G T O

I S : 4 3 4 ( P a r t s I &

I I ) - 1 9 6 4

( C l a u s e

2 . 1 ,

4 . 1 a n d 4 . 2 )

9

N O M I N A L

A R E A

O F

C O N D U C

T O R

( 1 )

m m 2

1 1 . 5 2 . 5 4 6 1 0 1

6 2 5 3 5 5 0 7 0 9 5 1 2 0 1 5 0 1 8 5 2 2 5 2 4 0 3 0 0

E N C L O S E

D

I N

C O N D U I T

O R

T R U N K I N G

O n e - F l a

t

O n e - F l a t 3 -

T w i n C a b

l e ,

S i n g l e - P h a s e

a c o r d c

C u

( 2 ) A 1

0 1 3 1 7 2 3 2 9 3 9 5 3 6 7 — — — — — — — — — —

A

l

( 3

)

A

8 1 0 1 3 1 8 2

2 3 1 4 1 5 2 —

—

—

—

—

—

—

—

—

—

C o r e

C a b l e ,

T h r e e - P h a s e

C u

( 4 ) A

9 1 1 1 5 2 0 2 5 3 4 4 7 6 0 —

— — — — — — — — —

A l

( 5 ) A

7 9 1 1 1 7 2 0 2 7 3 6 4 6 —

— — — — — — — — —

C L I P P E D

D I R E C T

A N D

U N - E N C L O S E D

O n e - F l a t

T w i n C a b l e ,


a c o r d c

t C u

( 6 )

A 1 2 1 5 2 0 2 7 3 4 4 6 6 2 7 9 —

— — — — — — — — —

A l

( 7 ) A 9 1

2 1 6 2 1 2 6 3 6 4 6 6 1 —

—

—

—

—

—

—

—

—

— —

—

—

—

— —

— O n e - F l a

t 3 -

C o r e C a b l e ,


C u

( 8 )

A 1 0 1 4 1 8 2 4 3 0 4 0 5 7 7

0 —

—

- -

A l

( 9 )

A 8 1 1 1 4 1 8 2 3 3 1 4 3 5 4 —

— — — — — — — — —

O n e - C i r c u l a r

i : T w i n C a b l e ,


a c o r d c

C u

( 1 0 ) A 1

0 1 3 1 8 2 3 3 0 4 1 5 5 7 0 8 6 1 0 9 1 2 8 1 5 7 1 8 0 2 0 5 2 3 4 2 6 4 2 7 5 3 1 9

I

A l

( 1 1 ) A

8 1 0 1 4 1 8 2 3 3 2 4 3 5 4 6 6 8 4 1 0 0 1 2 1 1 3 9 1 5 9 1 8 1 2 0 5 2 1 3 2 4 7


3 o r 4 C o r e

C a b l e , T h r e e -

P h a s e

C u

( 1 2 )

A 9 1 2 1 6 2 1 2 6 3 6 4 8 6 1 7 5 9 2 1 1 2 1 3 7 1 5 7 1 7 8 2 0 4 2 3 1 2 4 0 2 8 0

A l

( 1 3 )

A 7 9 1 2 1 6 2 0 2 8 3 7 4 7 5 8 7 1 8 7 1 0 6 1 2 3 1 3 8 1 5 8 1 7 9 1 8 6 2 1 7

D E F I N E D

C O N D I T I O N S


T w i n C

a b l e ,

S i n g l e -

P h a s e

a c o r

d c

C u

( 1 4 ) A —

— — 2 7 3 3 4 6 6 3 8 3 1 0 1 1 2 5 1 5 6 1 8 8 2 1 4 2 4 3 2 7 6 3 0 9 3 2 1 3 7 0

A l

( 1 5 )

A — — — 2 1 2 5 3 6 4 9 6 5 7 8 9 7 1 2 1 1 4 6 1 6 6 1 8 9 2 1 4 2 3 9 2 4 9 2 8 7


3 - C o r e C a b l e ,


a c

C u

( 1 6 )

A — — — 2 4 2 9 4 0 5 5 7 2 8 8 1 1 0 1 3 8 1 6 7 1 9 3 2 1 8 2 4 5 2 7 4 2 8 4 3 2 8

A l

( 1 7 ) A — _ —

. 1 8 2 2 3 1 4 3 5 8 6 8 8 5 1 0 7 * 1 3 0 1 5 0 1 6 9 1 9 0 2 1 2 2 2 0 2 5 4



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6 21 17

*Sales Office is at 5 Chowringhee Approach, P.O. Princep Street,CALCUTTA 700072

†Sales Office is at Novelty Chambers, Grant Road, MUMBAI 400007

‡Sales Office is at 'F' Block, Unity Building, Narashimaraja Square.BANGALORE 560002

2710 85

309 65 28

222 39 71

Printed at Printograph, New Delhi, Ph : 5726847

Documents

Is 3961-3 Recommended Current Ratings for Cables Part 3 Rubber Insulated Cables