IEC_60364-2-1970_scan.pdf

C.D.UU.D.c.:621.316.17COMMISSION ELECTROTECHNIQUE INTERNATIONALE(ffiliesetion de Normalisation-IS)RECOMMANDATION DE LA CEIINTERNATIONAL ELECTROTECHNICAL COMMISSION(affiliated to thenrganization for Standardizion-)IEC RECOMMENDATIONPublication 364-2Premiere edition-First edition1970、Installations electriques des batimentsDeuxieme partie:Principes fondamentauxElectrical installations of buildingsPart 2:Fundamental principlesDroits de reproduction rservs-Copyright-all rights reservedAucune partie de cette publleation ne peat etre reproduite i utilise sous No part of.this publication may be reproduced or utilized in anyquelque forme que ce soit et par aucun procdde,dlectronique ou meca-form or by any means,electronic or mechanical,including photocopyingnique,ymis photocopi ates microfmsorddeerandmicrofim,without permission inrtingfromth publisher.Bureau Central de la Commission Electrotechnique Internationale1,rue de VarembeGeneve,SuisseIECVOL I2晓2-3CONTENTSFOREWORDPREFACE.ClauseSECTION ONE-PROTECTION FOR SAFETY1.General.72.Protection against direct contact.73.Protection against indirect contact.74.Protection against thermal effects in normal service.75.Protection against overcurrent.96.Protection against fault currents.:.97.Protection against overvoltage.:.9SECTION TWO-DESIGN8 General.99.Characteristics of the available supply or supplies.910.Nature of demand.1111.Emergency supply or supplies.1112.Environmental conditions.1113.Cross-section of conductors.1114.Type of wiring and methods of installation.1315.Protective equipment.1316.Emergency control.1317.Disconnecting devices.1318.Prevention of mutual influence between electrical and non-electrical installations.1319.Accessibility of electrical equipment.13SECTION THREE-SELECTION OF ELECTRICAL EQUIPMENT20.General.1521.Characteristics.1522.Conditions of installation.1523.Prevention of harmful effects.17SECTION FOUR-ERECTION AND INITIAL TESTING OF ELECTRICAL INSTALLATIONS24.Erection.1725.Initial testing.175.Protection against overcurrentPersons or livestock shall be protected against injury and property shall be protected againstdamage due to excessive temperatures or electromechanical stresses caused by any overcurrentslikely to arise in live conductors.This protection can be achieved by one of the following methods:-automatic disconnection on the occurrence of an overcurrent before this overcurrent attains adangerous value taking into account its duration;-limiting the maximum overcurrent to a safe value and duration.6.Protection against fault currentsConductors,other than live conductors,and any other parts intended to carry a fault currentshall be capable of carrying that current without assuming excessive temperature.Notes 1.-Particular attention should be given to earth fault currents.2.-For live conductors,compliance with Clause 5 assures their protection against any fault currents,includingovercurrents caused by faults.Protection against overvoltage7.1 Persons or livestock shall be protected against injury and property shall be protected against anyharmful effects of a fault between live parts of circuits supplied at different voltages.7.2 Persons or livestock shall be protected against injury and property shall be protected against damage.from any excessive voltages likely to arise due to other causes(e.g.atmospheric phenomena orswitching voltages).SECTION TWO-DESIGN8.GeneralFor the design of the electrical installation,the following factors shall be taken into account toensure:-the protection of persons,livestock and property in accordance with Section One;-the proper functioning of the electrical installation for the use intended.The information required as a basis for design is listed in Clauses 9,10,11 and 12.The require-ments with which the design should comply are stated in Clauses 13 to 19.9.Characteristics of the available supply or supplies9.1 Nature of current:a.c.and/or d.c.9.2 Nature and number of conductors:-For a.c.:phase conductor(s);neutral conductor;protective conductor.-For d.c.:conductors equivalent to those listed above.