CEI NORME IEC INTERNATIONALE 719 INTERNATIONAL Deuxieme édition STANDARD Second edition 1992-03 Calcul des valeurs minimales et maximales des dimensions exterieures moyennes des conducteurs et cables a ames circulaires en cuivre et de tension nominale au plus égale a 450/750 v Calculation of the lower and upper limits for the average outer dimensions of cables with circular copper conductors and of rated voltages up to and including 450/750 V CEl1992Droitsdereproductionréservés - Copyright -- all rights reserved Aucune partie de cette publication ne peut stre reproduite ni No part of this publication may be reproduced or utilizod in any form or by any means, electronic or mechanical, utilisée sous quelqueformeque ce soit etpar aucunpro- including photocopying and microfilm, without pemission céde6lectroniqueoumécanique,ycomprislaphotocopieet les microfilms, sans I'accord crit de I'editeur. inwriting fromthepublisher. CODEPRIX Commission Electrotechnique Internationale G PRICECODE International Electrotechnical Commission MemAyHapoaHan SneKTpOTexHHyeCHaA KoMNCcHA Pourprix, voir catalogue en vigueur Forprice,seocurrentcatalogue 719@IEC INTERNATIONALELECTROTECHNICAL COMMISSION CALCULATION OF THE LOWER AND UPPER LIMITS FOR THE AVERAGE OUTER'DIMENSIONS OF CABLES WITH CIRCULAR COPPER CONDUCTORS AND OF RATED VOLTAGES UP TO ANDINCLUDING450/750V FOREWORD possible, an international consensus .of opinion on the subjects dealt with. 2) They have the form of recommendations for international use and they are accepted by the National Committeesinthatsense. 3) In order to promote international unification, the IEc expresses the wish that all National Committees should adopt the text of the lEc recommendation for their national rules in so far as national.conditions will permit.Any divergence between the fEc recommendation and the corresponding national rules should, as faraspossible,beclearlyindicatedinthelatter. This International Standard has been prepared by Sub-Committee 2oB: Low-voltage cables, of 1Ec Technical Committee No. 2o: Electric cables. This second edition of 1Ec 719 replaces the first edition issued in 1981. The text of this standard is based on the following documents: DIS Report on Voting 20B(CO)113 20B(CO)123 Full information on the voting for the approval of this standard can be found in the Voting Reportindicated inthe abovetable. 719IEC CALCULATION OF THE LOWER AND UPPER LIMITS FOR THE AVERAGE OUTER DIMENSIONS OF CABLES WITH CIRCULAR COPPER CONDUCTORS AND OF RATED VOLTAGES UP TO ANDINCLUDING450/750V General 1 1.1 Scope This International Standard specifies a method for calculation of the lower and upper limits for the average outer diameter of cables and the outer dimensions of flat cords with circular copper conductors and of rated voltages up to and including 45o/75o V. This standard is not applicable to mineral insulated cables. The method shall not be used to calculate the diameter over the core assembly for determining the sheath thickness; the method given in Appendix A of IEc 5o2 shall be used for this purpose. NOTES It is stressed that the conductor diameters given in the tables are intended only for use in this standard as a basis for calculation and are not intended for verification by measurement. The factors given in 2.5 and 3.1 of this standard may be varied in preparing standards for cables in which the number of cores, the hardness of the insulation, precise positioning of the conductors or other factors may affect the dimensional tolerances permissible. 1.2 Normativereferences The following normative document contains provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the edition indicated was valid. All normative documents are subject to revision, and parties to agreements based on this international Standard are encouraged to investigate the possi- bility of applying the most recent edition of the normative document listed