IEC_60664-1_109_38_CD.pdf

109/38/CDCOMMITTEE DRAFT(CD)IEC/TC or SC:TC 109 Project number IEC 60664-1,Ed.2 Title of TC/SC:Insulation coordination for low-voltage equipment Date of circulation 2004-03-26 Closing date for comments 2004-07-02 Also of interest to the following committees see below Supersedes document 109/33/MCR Functions concerned:Safety EMC Environment Quality assurance Secretary:G.Krauss Gerhard.K THIS DOCUMENT IS STILL UNDER STUDY AND SUBJECT TO CHANGE.IT SHOULD NOT BE USED FOR REFERENCE PURPOSES.RECIPIENTS OF THIS DOCUMENT ARE INVITED TO SUBMIT,WITH THEIR COMMENTS,NOTIFICATION OF ANY RELEVANT PATENT RIGHTS OF WHICH THEY ARE AWARE AND TO PROVIDE SUPPORTING DOCUMENTATION.Title:IEC 60664-1,Ed.2:Insulation coordination for equipment within low-voltage systems-Part 1:Principles,requirements and tests(Titre):CEI 60664-1,Ed.2:Coordination del lisolement des matriels dans les systmes(rseaux)basse tension-Partie 1:Principes,prescriptions et essais Introductory note The above-mentioned document is also of interest for IEC committees:TC:2-9 18-20-21-22-23-26-27-31-33-34-44-45-47-48-55-57-61-62-64-65-66-69-72-78-79 81-82-85-88-91-94-95-96-98-100 103 108-JTC1 SC:17A-17B-17D 21A 22E 22G 23E 23H 23J-32B-32C 34B 34C 34D-37A 47E 48B 62B 62D 65A This is the first draft to prepare IEC 60664-1 Ed.2.The draft was prepared by Maintenance team 1 during its meeting in Munich on 3/4 February 2004.taking into account the decision of the TC109 Beijing 2002 plenary meeting on the list of new work 109/11/DC,109/18/INF and other available proposals.This document is presented in the form of an amendment to get initial NCs reactions to the major revision activities.The project will eventually lead to a new edition,which will be a technical revision of Ed.1.0.FORM CD(IEC)2002-05-14 Copyright 2004 International Electrotechnical Commission,IEC.All rights reserved.It is permitted to download this electronic file,to make a copy and to print out the content for the sole purpose of preparing National Committee positions.You may not copy or mirror the file or printed version of the document,or any part of it,for any other purpose without permission in writing from IEC.IEC 60664-1 Ed.2/CD 109/38/CD 2INTERNATIONAL ELECTROTECHNICAL COMMISSION TECHNICAL COMMITTEE 109:INSULATION CO-ORDINATION FOR LOW VOLTAGE EQUIPMENT The clauses listed,or sections in the clauses,will be revised as follows.Revisions are marked in red colour and either crossed out or underlined.2.2.2.2 Selection of rated impulse voltage for equipment Replacement of Table 1 by:Table 1 Rated impulse voltage for equipment energized directly from the low-voltage mains Rated impulse voltage 2)Nominal voltage of the supply system 1)based on IEC 60038 3)Overvoltage category 4)Three phase Single phase Voltage line to neutral derived from nominal voltages a.c.or d.c.up to and including V I II III IV 230/400 277/480 400/690 1 000 120-240 50 100 150 5)300 600 1 000 330 500 800 1 500 2 500 4 000 500 800 1 500 2 500 4 000 6 000 800 1 500 2 500 4 000 6 000 8 000 1 500 2 500 4 000 6 000 8 000 12 000 1)See annex B for application to existing different low-voltage mains and their nominal voltages.2)Equipment with these rated impulse voltages can be used in installations in accordance with IEC 60364-4-443.3)The/mark indicates a four-wire three-phase distribution system.The lower value is the voltage line-to-neutral,while the higher value is the voltage line-to-line.Where only one value is indicated,it refers to three-wire,three-phase systems and specifies the value line-to-line.4)See 2.2.2.1.1 for an explanation of the overvoltage categories.5)Nominal voltages for single-phase systems in Japan are 100V or 100-200V.However,the value of the rated impulse voltage for the voltages is determine from columns applicable to the voltage line to neutral of 150V(See annex B)3.1.4 Dimensioning of clearances of functional insulation For a clearance of functional insulation,the maximum impulse voltage or steady-state voltage or recurring peak voltage expected to occur across it under rated conditions of the equipment,in particular the rated voltage and rated impulse voltage,is the appropriate impulse withstand voltage.3.1.5 Dimensioning of clearances of basic,supplementary and reinforced insulation Clearances of basic and supplementary insulation shall each be dimensioned as specified in table 2 corresponding to the rated impulse voltage,according to 2.2.2.2 or 2.2.2.3.1;or IEC 60664-1 Ed.2/CD 109/38/CD 3 the impulse withstand voltage requirements according to 2.2.2.3.2;and as specified in table 7 corresponding to the steady-state voltage according to 2.2.1.1;and the recurring peak voltage according to 2.2.3;and the temporary overvoltage according to 2.2.4 withstand requirements.With respect to impulse voltages clearances of reinforced insulation shall be dimensioned as specified in table 2 corresponding to the rated impulse voltage but one step higher in the preferred series of values in 2.1.1.2 than that specified for basic