IEC_364-5-523_1983_PARTE_1.pdf

4NORMECEINTERNATIONALEIECINTERNATIONAL364-5-52:STANDARDPremiere editicFirst editic19:Installations electriques des batimentsCinquleme partie:Choix et mise en oeuvre des materiels electriquesChapitre 52:CanalisationsSection 523-Courants admissibles美Electrical installations of buildingsPart 5:Selection and erection of electrical equipmentChapter 52:Wiring systemsSection 523-Current-carrying capacitiesSCHNEIDER ELECTRIC VENEZUELA S.A.evision de la presente publicationRevision of this publicationLe contenu technique des publications de la CEI est cons.The technical content of I E C publications is kept under con-nment revu par la Commission afin dassurer quil reflete bienstant review by the I E C,thus ensuring that the content reflectstat actuel de la technique.current technology.Les renseignements relatifs a ce travail de revision,aInformation on the work of revision,the issue of revised edi-tablissement des editions revisees et aux mises a jour peuventtions and amendment sheets may be obtained from IECe obtenus aupres des Comites nationaux de la CEI et enNational Committees and from the following I E C sources:nsultant les documents ci-dessous:Bulletin de la CE IIEBulletinAnnuaire de la C E IIEC YearbookCatalogue des publications de la CEICatalogue of I E C PublicationsPublie annuellementPublished yearlyerminologieTerminalogyEn ce qui conceme la terminologie generale,le lecteur seFor general terminology,readers are referred to I E C Publi-portera a la Publication 50 de la CEI:Vocabulairecation 50:International Electrotechnical Vocabulary(IEV),ectrotechnique International(VEI),qui est tablie sous formewhich is issued in the form of separate chapters each dealingchapitres separes traitant chacun dun sujet defini,IIndex ge-with a specific field,the General Index being published as a se-ral etant publie separement.Des details complets sur le VEIparate booklet.Full details of the IEV will be supplied onuvent Etre obtenus sur demande.request.Les termes et definitions figurant dans la presente publicationThe terimis and definitions contained in the present publicationit t soit repris du VEI,soit spcifiquement approuves aux finshave either been taken from the IEV or have been specifically:cette publication.approved for the purpose of this publication.ymboles graphiques et litterauxGraphical and letter symbolsPour les symboles graphiques,symboles litueraux et signesFor graphical symbols,and letter symbols and signs approvedusage gneral approuvs par la C EI,le lecteur consultera:by the I EC for general use,readers are referred to:-Ja Publication 27 de la C E I:Symboles litteraux a utiliser en-IEC Publication 27:Leuer symbols to be used in electricalelectrotechnique;technology;-la Publication 617 de la CEI:Symboles graphiques pour-IEC Publication 617:Graphical symbols for diagrams.schemas.Les symboles et signes contenus dans la presente publicationThe symbols and signs contained in the present publicationt et soit repris des Publications 27 ou 617 de la CEI,soithave either been taken from IEC Publications 27 or 617,orecifiquement approuves aux fins de cette publication.have been specifically approved for the purpose of this publication.364-5-523IEC 19833CONTENTSPageFOREWORD.5PREFACE.5Clause523.Current-carrying capacities.7523.0 Introduction.7523.1 General.7523.2 Ambient temperature.9523.3 Soil thermal resistivity.9523.4 Groups containing more than one circuit11523.5 Number of loaded conductors.11523.6 Conductors in parallel.13523.7 Variation of installation conditions along a route.13TABLES.15