1、C.D.U./U.D.C.:621.316.31:744.4/5COMMISSION ELECTROTECHNIQUE INTERNATIONALE(affiierganisation Internationale de Normalisation-ISD)RECOMMANDATION DE LA CEIINTERNATIONAL ELECTROTECHNICAL COMMISSION(affiliated to the International Organization for Standardization-S)IEC RECOMMENDATIONPublication 113-3Pre
2、miere edition-First edition1974Schemas,diagrammes,tableauxTroisieme partie:Recommandations generales pour Ietablissement des schemasDiagrams,charts,tablesPart 3:General recommendations for the preparation of diagramsDroits de reproduction rservs-Copyright-all rights reservedAucune partie de cette pu
3、biication ne peut tre reproduite ni utillsee sous No part of this publication may be reproduced or utilized in anyquelque forme que ce soit et par aucun procede,electronique cu meca-form or by any means,electronic or mechanlcal,inciuding photocopyingnique,y compris la photocopie et ies microfilms,sa
4、ns Iaccord derit de Iditeurand microfilm,without permission in writing from the publisher.Bureau Central de la Commission Electrotechnique Internationale1,rue de VarembeJECGeneve,SuisseVOL.10Prix Fr.8:32.一Price S.Fr.一3一CONTENTSPageFOREWORD5PREFACE,Clause1.Introduction2.Drawing sizes,73.Application o
5、f graphical symbols13.1 Different kinds of graphical symbols.3.2 Combinations and composition of symbols9C3.3 Choice of symbols for a diagram.93.4 Symbol size,line thicknesses.113.5 Orientation of symbols.153.6 Representation of terminals.153.7 Representation of conductors154.Connecting lines,.174.1
6、 Identification of connecting lines.174.2 Multi-line representation.174.3 Single-line representation.174.4 Omitting lines.,194.5 Number of conductors,215.Application of single-line representation to apparatus.216.Methods of indicating symbol location,.,.,.257.Operational state to be represented.27一5
7、INTERNATIONAL ELECTROTECHNICAL COMMISSIONDIAGRAMS,CHARTS,TABLESPart 3:General recommendations for the preparation of diagramsFOREWORD1)The formal decisions or agreements of the IEC on technical matters,prepared by Technical Committees on which all theNational Committees having a special interest the
8、rein are represented,express,as nearly as possible,an internationalconsensus of opinion on the subjects dealt with.2)They have the form of recommendations for international use and they are accepted by the National Committees in thatsense.3)In order to promote international unification,the IEC expre
9、sses the wish that all National Committees should adoptthe text of the IEC recommendation for their national rules in so far as national conditions will permit.Any divergencebetween the IEC recommendations and the corresponding national rules should,as far as possible,be clearly indicatedin the latt
10、er.PREFACEThis recommendation has been prepared by Sub-Committee 3B,Preparation of Diagrams,Charts andTables.Item Designation,of IEC Technical Committee No.3,Graphical Symbols.Two drafts were discussed at the meeting held in Paris in 1972.As a result of this meeting,a combinednew draft,document 3B(C
11、entral Office)8,was submitted to the National Committees for approval underthe Six MonthsRule in February 1973.The following countries voted explicitly in favour of publication of Part 3:AustraliaJapanAustriaNetherlandsBelgiumPortugalDenmarkRomaniaEgyptSouth Africa(Republic of)FinlandSwedenFranceSwi
12、tzerlandGermanyTurkeyIsraelUnited KingdomItalyUnited States of America一93.2 Combinations and composition of symbolsPublication 117 does not give all the possible examples.Any symbol may be composed by combiningtogether the existing symbols in this publication,as well as with the letter symbols of IE
13、C Publication 27,Letter Symbols to be used in Electrical Technology.The use of qualifying or supplementary symbols given in certain parts of Publication 117 is not limitedonly to the chapter in which they appear.If the required parts for building a symbol are not found in IEC publications,graphical
14、or letter symbolsestablished by other sources may be used,but in such a case their meaning should be clearly stated.3.3 Choice of symbols for a diagramWhen Publication 117 shows alternative forms,in principle the basic rules for the choice of a symbolshould be:a)to use the simplest form of symbol ad
15、equate for the particular purpose;b)to use the preferred form wherever possible;c)to use the chosen forms consistently throughout the same set of technical documents.Example:For a relatively simple explanatory diagram,such as a block diagram,and especially where single-linerepresentation can be used
16、,it is sufficient in many cases to use general or simplified form symbols.Example:for a transformer,see Figure 1.FIGURE 1For an explanatory diagram intended to facilitate a detailed study,such as a circuit diagram,the generalsymbol may not be sufficient.For example,for the transformer it may be necessary to use a more detailedsymbol including supplementary or qualifying symbols showing the connection of windings and the vectorsymbol group according to IEC Publication 76,Power Transformers.For example,see Figure 2.Thesimplified symbol form(Form Ia),however,may still be sufficient.Yy0FIGURE 2
