(00000100IECRINTERNATIONALSTANDARDLow-voltage electrical installations -IEC 60364-1Edition 6.0 2025-09Part 1: Fundamental principles, assessment of general characteristics, anddefinitionsICS 91.140.50ISBN 978-2-8327-0677-0THIS PUBLICATION IS COPYRIGHT PROTECTEDCopyright @ 2025 IEC,Geneva,SwitzerlandAll rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form orby any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from eitherIEC or IEC's member National Committee in the country of the requester. 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Make sure that you obtained this publication from an authorized distributor.FOREWORD1.11.1.11.1.21.21.31.41.51.5.11.5.21.5.31.5.41.61.71.7.11.7.21.81.8.11.8.21.8.31.8.41.91.9.11.9.21.9.31.10ScopeIEC 60364-1:2025 O IEC2025CONTENTSScope of this documentScope of the IEC 60364 seriesNormative references .Terms and definitionsStructure of the IEC 60364 seriesFundamental principlesProtection for safety ..Design ...Selection of electrical equipmentErection and verification of electrical installationsAssessment of general characteristics.Electrical installations...General structure of an electrical installationMaximum demand and diversity.Conductor arrangement.General.Live conductors..Protective conductors.System-referencing-conductorsTypes of electric systems .GeneralTypes of electric systems for alternating currentTypes of electric systems for direct current.Compatibility .1.10.11.10.21.111.121.13Compatibility of characteristicsElectromagnetic compatibility ...Maintainability ..Safety services ..Continuity of service..Annex A (informative) Structure of the IEC 60364 seriesAnnex B (informative) List of notes concerning certain countriesBibliography .Figure 1 -- Single-phase two-wire system with two line conductorsFigure 2 -- Single-phase two-wire system derived from a three-phase four-wire system .....Figure 3 - Single-phase three-wire system.Figure 4 -- Two-phase three-wire system ...Figure 5 -- Three-phase three-wire system.Figure 6 - Three-phase four-wire systemFigure 7 -- Two-wire system .-Figure 8 - Three-wire system.Figure 9 - Example of an AC TN-S system with separate neutral conductor andprotective earthing conductor throughout the system .13555678.8101415161717117171 20 2021212336424242.42434344464818...1818181919191924IEC 60364-1:2025 IEC 2025INTERNATIONAL ELECTROTECHNICAL COMMISSIONLow-voltage electrical installations -Part 1: Fundamental principles, assessmentof general characteristics, and definitionsFOREWORD1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprisingall national electrotechnical committees (IEC National Committees).The object of IEC is to promote internationaco-operation on all guestions concernina standardization in the electrical and electronic fields.To this end andin addition to other activities,IEC publishes International Standards,Technical Specifications,Technical ReportsPublicly Available Specifications (PAS) and Guides (hereafter referred to a...
