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 8270-5 (1976): Guide for preparation of diagrams, chartsand tables for electrotechnology, Part 5: Interconnectiondiagrams and tables [ETD 1: Basic ElectrotechnicalStandards]

16 : 8270 (Part V)-1976

Indian Standard GUIDE FOR PREPARATION OF DIAGRAMS,

CHARTS AND TABLES FOR ELECTROTECHNOLOGY

PART V INTERCONNECTION DIAGRAMS AND TABLES

Electrotechnid Standards Sectional Committee, ETDC 1

Rcfiresenfing

BharatBijlee Ltd, Bombay; u&Rotating Machinery Sectional Committee, ETDC 15, IS1

MCdCtS SHRI H. V. BADRINATH

;yAVS KB&z . .

SHRI M. R. BHAT

_tiar V. S. BHATIA

SHRI v. w. cHEMauaxcAa

Wireless Planning-& Co-ordination Wing, Ministry of Communications, New Delhi

National Physical Laboratory (CSIR), New Delhi National Test House, Calcutta Conductors & Cables Sectional

ETDC 32, IS1 Commitke,

Switchgear & Controlgear Sectional Committee, ETDC 17, IS1

Indian Electrical Manufacturers’ Association,

SHRI R. M. NANAVATI (Alternate) BRIG N. DAYAL Ministry of Defence (DGI)

LT.COL S. S. SWGHAL (Alternate) DIRECTOR (TED) Central Electricity Authority (Department of

Power), Ministry of Energy DEPUTY DIRECTOR (TED) (Altmzate)

GENERAL MANAGER Directorate General of Posts & Telegraphs (Ministry of Communications), New Delhi

DIRECTOR (T’AANSMIISSION) (Alternate) SHRI K. C. KAUL Bharat Heavy Electricals Ltd, Bhopal COL C. D. MALANEY Electronics & Radar Development Establishment

Snar V. L. &TRY (Al&mate) (Ministry of Defence), Bangalore

SHRI S. N. MITRA Electronic Equipment Sectional Committee, LTDC 4, IS1

PROP R. C. NARAY~AN General Nomenclature & Symbols Subcommittee, ETDC 1 : 3, ISI

(Continued on page 2)

0 Co&ri>hht 1977

INDIAN STANDARDS INSTITUTION

This publication is protected under the Indian Copyight Act (XIV of 1957) and reproduction in whole or in part by any means except with written permission of the publisher shall be deemed to be an infringement of copyright under the said Act.

IS : 8270 (l'art V)-1976

(Continued from Page 1)

Members Represenfing

SHRI U. K. PATWARDHAN Transformers Sectional Committee, ETDC 16, IS1 Sxztu R. I-AH Cen~~~~ti;chemical Research Institute (CSIR),

SHY I-I. N. VENKOBARAO (Alternate) SHRX K. N. lRAby\sw~H~ Electrical Wiring Accessories Sectional Committee,

ETDC 44, IS1 Da T. S. M. RAO Relays Sectional Committee, ETDC 35, IS1 DR S. M. SEN Institution of Engineers (India), Calcutta DR H. V. K. UDUPA Secondary Cells & Batteries Sectional Committee,

ETDC 11. IS1 DR B. H. W~IA

SHRI S. P. SACHDEV, Director (Elec t&j

Semiconductor* Devices 8-z Integrated Circuits Sectional Committee, LTDC 10, IS1

Director General, IS1 (Ex-ofi& A4mbn)

secretwy

SHN JAGDISH Cbi.4rr~n.4 Assistant Director (Elec tech), IS1

General Nomenclature and Symbols Subcommittee, ETDC 1 : 3

C0sZXfltr

PROP R. Cl. NARAYAHA~ Delhi College of Engineering, Delhi

Sxar V. K. BAG SHRI. V. S. BHATIA

National Physical Laboratory (GSIR), New Delhi Siemens India Ltd, Bombay

SHRI N. K. JAYARAUAN {dltcmatc) DEP~JT~ DIRXTOR (TBD) Central Electricity Authority (Department of

SHRI M. N. MAsliu~ Power), Ministry of Energy

Department of Communications (Posts and

Srlnr S. RA~XABIIADRAN Telegraphs Board), New Delhi

SHRI N. C. TANDAN Indian Institute of Technology, New Delhi Voltas Limited, Bombay

2

IS : 8270 (Part I’) - 1976

Indian Standard GUIDE FOR PREPARATION OF DIAGRAMS,

CHARTS AND TABLES FOR ELECTROTECHNOLOGY

PART V INTERCONNECTION DIAGRAMS AND TABLES

0. FOREWORD

0.1 This Indian Standard (Part V) was adopted by the Indian Standards Institution on 14 December 1976, after the draft finalized by the Electrotechnical Standards Sectional Committee had been approved by the Electrotechnical Division Council.

0.2 A number of standards have been published on graphical symbols for use on diagrams in the field of electrotechnology (see various parts of IS : 2032*). After having covered most of the needs for graphical symbols, with the exception of those for new fields of electrotechnology still under consideration, it has been found advisable to supplement the Indian Standards on graphical symbols with standards for the preparation of diagrams.

0.3 This standard includes definitions and classification of diagrams, charts and tables; guiding principles for use and combination of graphical symbols; guiding principles for preparation of diagrams; guidingprinciples for supplementing or replacing diagrams by charts and tables; item designation; etc.

0.4 This standard is being brought out in five parts as follows:

Part I Definitions and classification Part II I tern designations Part III General requirements for diagrams Part IV Circuit ~diagrams Part V Interconnection diagrams and tables

0.5 This standard lays down guidelines for preparation of interconnection diagrams and tables.

*Graphical symbols used in electrotechnology.

3

lS : 8270 (Part V) - 1976

0.6 Some of the methods used in the figures in this standard are similar to those given in IS : 55%1970*. These figures, however, are only examples and are not intended to 1~~ recommendations for the choice of designation and marking method.

Also, in these examples, item designations for’cables and conductors are shown in accordance with IS : 8270 (Part II)-19767 (with letters X and W according to Table 1). However, in accordance with IS : 8270 (Part II)- 1976t other designations may be used. Specially in diagrams showing only cables, a numerical designation for each cable is generally sufficient (this is in fact the minimum designation foreseen in IS: 8270 (Part II)-19767).

0.7 While preparing this standard, assistance has been derived from IEC Pub 113-5 (~1975) ‘Diagrams, charts, tables : Part 5 Preparation of inter- connection diagrams and tables’ issued by the International Elpctrotechnical Commission.

1. SCOPE

1.1 This standard (Part V) lays down the guidelines for the preparation of interconnection diagrams and tables.

2. OBJECT

2.1 Interconnection diagrams and tables provide information on the ex- ternal electrical connections between units of equipment. They are used as an aid in the fabrication ofwiring harnesses and for maintenance purposes.

2.1.1 Information on the internal connections in units is not normally included, but references to the appropriate circuit or wiring diagrams may be provided.

2.1.2 The diagrams may employ single or multiline representation and may be combined with or replaced by tables provided clarity is maintained. The latter are recommended when the number of interconnections is large.

3. INTERCONNECTION DIAGRAMS

3.1 Layout - Interconnection diagrams employ straight lines and simple outlines - squares, circles or rectangles - to depict equipment items. The connections between the units are symbolized by lines which may represent individual wires or complete cables. The diagrams should be arranged so that the lines may be drawn in a simple and logical manner between the various points of termination.

Views should be shown as though all connections were in one plane.

*Guide for marking of insulated conductors. tGuide for preparation of diagrams, charts and tables for electrotechnology: Part II

Item designation.

4

IS : 82iO ‘Part V) - 1976

Where practicable the sequence and arrangement of rhe equipment s>-mbols on the diagram should depict the physical arrangrmrnt of the installation. A location diagram should support the interconnection information if 111~ rrlative location of such items as terminals or connectors is not clear.

Fig. 1 is an rxample of a simple interconnection diagram.

r*-- PANEL A:

r- ---l i PANNCL B i

L. 1 7 ; 2 3L125 5

w2

II

I

w3

3x1.5 II

2x1,5

1-l

FIG. 1 SIMPLE INTERCONNECTION DIAGRAM

3.2 Identification

3.2.1 Units of Equipment - The outline representing each item should he suitably identified, for example, by a functional title or item designation.

3.2.2 Connectors - Thesymbol for each connector should also be identifi- ed, for example, by item designation. if the connector forms part of a cable

Such identification is not required assembly separately designated in the

interconnection information, or if it is of a type covered by an explanatory note.

3.2.2.1 Cable assembly information may be shown on the diagram together Tvith identification of connecting assemblies, adaptors, cable clampc, etc, and any special assembly instructions which are required.

3.2.3 Connector Contacts - Contact symbols should be identified by: a) either markings on the actual connector, b) or designations in associated documents, c) or arbitrary designations explained in the interconnection informa-

-tion.

3.2.4 lerminals -Terminals may be depicted by symbols or the inter- connecting lines may be terminated at the item outline. In either case each point of termination should be identified by:

a} either a marking on the actual equipment,

5

IS : 8270 (Part V) - 1976

11) or a designation in associated documents, c) or an arbitrary designation explained in the interconnection

information.

3.2.5 Conductors - The line representing each conductor (either individual or in a cable) should be identified:

a) either by a marking or colour coding on the actual conductor; b) or by a code assigned on an overall system basis, explained on the

diagram or in supporting documentation; c) or in any other suitable manner.

32.5.1 Such identification may not be needed in some cases. 3.2.5.2 Supplementary information such as conductor function, size,

length, screening and voltage rating, may be included.

3.2.6 Cables - The line representing each cable may be identified by the marking on the actual cable, type designation, item designation, or other- wise.

3.2.6.1 Supplementary information may be included as in 3.2.5.

3.3 Types of Diagram

3.3.1 hdividual Conductor Refireseutation - Each individual conductor between equipment items should be represented by a separate line as shown in Fig. 2.

pAN:L D PANEL E

! 2 46

FIG. 2 TNDIVIDVAL CONDUCTOR REPRESEST-ATION

3.3.1.1 Apart from small gaps to accommodate identification or supplementary information the lines may be drawn in full between the appropriate terminations as in Fig. 3.

3.3.1.2 Groups of hnes having the same destination may be replaced by a single line for some part of their length provided corresponding ends are suitably designated (see Fig. 4). This method should be used to simplify diagrams which otherwise would contain a large number of lines which would be difficult to follow.

3.3.1.3 The method may be extended by branching the single line where groups of lines have different destinations. In such cases information

6

IS : 8270 (Part V) - 1976

on the other end termination may usefully be shown at both ends of every he representing an individual connection (see Fig. 5).

FIG. 3 ~[DENTIFICATION ANQ SUPPLEME~NTARY INFORMATION IN INDIVIDUAL C~NLWCTOR REPRESENTATION

--rJnsv-

i

FIG. 4 GROWS OF LINES HAVING SAME DESTINATION

UNIT 1

rMPLlFlER

75--ZXl:A-

76--zXl:I3-

77--2X2:A-

Tel--2X2:8-

79-zxz:c-

-WI-X2

\ -

UNIT 2

COMPUTER

FIG. 5 GROUPS OF LINES HAVING DIFFERENT

7

=Wl-x3/ L

DE~XINATIONS

Is : 6270 (Part V) - 1976

3.3.1.4 Repeated information at the ends may generally be omitted as in Fig. 6.

A

0 ;;:j X21

C 77-‘,

D ?0- x3

-

1

E ?9- I /

=Wl-Xl

UNIT 2

-75-A.-

=Wl-x2

I!

COMPUTEFi

=Wl-x3

FIG. 6 OMITTING REPEATED INFORMATION

Alternatively, it is possible to omit the individual lines for most of their length provided corresponding ends are suitably identified and information on remote end destination is included (see Fig. 7).

! PANEL A !

I I

j

1 2 n3b

. AJTlSV

! Wl 2x1.5

r-----1

70 PANEL C

l- .---_

7 :

I PANEL.C '

I __.i

w3 TO PA-NEL B

1WZ

‘3X1.5 w21

FIG. 7 OMITTING A LARGE PORTION OF INDIVIDUAL LINES

3.32 Re&resentation of Cables and Other Multiconductor Assemblies - Each multiconductor assembly (cable, conductors in sheath, etc) connecting the various items of equipment should be represented by a single line (see Fig. 8).

8

IS : 8270 (Part V) - 1976

Lines representing multiconductor assemblies may be omitted for part of their length provided the residual ends are identified and opposite end destinations are given.

UNIT 3

FIG. 8 CABLES AND OTHER MULTI-CONDUCTOR ASSEMBLIES

4. INTERCONNECTION TABLES

4.1 The information given by interconnection diagrams may conveniently 1~ giwn lq- tabuiar listing. Usually each line of information relates to an individual connection. Tl le information relating to all connections to a given unit may be presented on sequential lines of this table. the information may be listed in circuit order.

Alternatively,

4.1.1 ‘Ihe details of tabular arrangement will depend on the circumsta- nces of each case. The basic data should include information regarding

9

IS : 8270 (Part V) - 1976

the connection ‘points and about the- conductor. Because so many satis- factory variants are possible no examples are shown in this standard.

4.15 Tables should be supplemented with equipment layout information showing :

4 b)

c> d)

the relative location of all portions of the equipment,

the terminal arrangement and identification of unmarked terminals. The data should show a wiring side view of the terminal arrange- ment. A left-to-right and top-to-bottom sequence assignment of terminal identification is recommended,

any special wiring arrangements which may not be conveyed with tabular information alone, and

the paths of cable harnesses when such paths are not readily deter- mined.

10