BS EN 60664-5-2007 Insulation coordination for equipment within low-voltage systems - Comprehensive method for determining clearances and creepage distances equal to or less than 2.pdf

1、BRITISH STANDARDBS EN 60664-5:2007Insulation coordination for equipment within low-voltage systems Part 5: Comprehensive method for determining clearances and creepage distances equal to or less than 2 mmThe European Standard EN 60664-5:2007 has the status of a British StandardICS 29.080.30g49g50g3g

2、38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN 60664-5:2007This British Standard was published under the authority of the Standards Policy and Strateg

3、y Committee on 31 December 2007 BSI 2007ISBN 978 0 580 57175 6National forewordThis British Standard is the UK implementation of EN 60664-5:2007. It is identical to IEC 60664-5:2007. It supersedes BS EN 60664-5:2003 which is withdrawn.The UK participation in its preparation was entrusted to Technica

4、l Committee GEL/109, Insulation co-ordination for low voltage equipment.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct app

5、lication.Compliance with a British Standard cannot confer immunity from legal obligations.Amendments issued since publicationAmd. No. Date CommentsEUROPEAN STANDARD EN 60664-5 NORME EUROPENNE EUROPISCHE NORM October 2007 CENELEC European Committee for Electrotechnical Standardization Comit Europen d

6、e Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2007 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 60664-5:2007 E ICS 29.080.30 Superse

7、des EN 60664-5:2003English version Insulation coordination for equipment within low-voltage systems - Part 5: Comprehensive method for determining clearances and creepage distances equal to or less than 2 mm (IEC 60664-5:2007) Coordination de lisolement des matriels dans les systmes (rseaux) basse t

8、ension - Partie 5: Mthode dtaille de dtermination des distances disolement dans lair et des lignes de fuite infrieures ou gales 2 mm (CEI 60664-5:2007) Isolationskoordination fr elektrische Betriebsmittel in Niederspannungsanlagen - Teil 5: Ein umfassendes Verfahren zur Bemessung der Luft- und Kriec

9、hstrecken fr Abstnde gleich oder unter 2 mm (IEC 60664-5:2007) This European Standard was approved by CENELEC on 2007-10-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standar

10、d without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member. This European Standard exists in three official versions (English, French, German). A version in any other

11、language made by translation under the responsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Cyprus, the Czech Republic

12、, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Foreword The text of document 109/61/CDV, future ed

13、ition 2 of IEC 60664-5, prepared by IEC TC 109, Insulation co-ordination for low-voltage equipment, was submitted to the IEC-CENELEC parallel Unique Acceptance Procedure and was approved by CENELEC as EN 60664-5 on 2007-10-01. This European Standard supersedes EN 60664-5:2003. The revision of Part 1

14、 of EN 60664 also required a revision of Part 5 of EN 60664, as Part 5 is closely linked to Part 1. In addition to a number of editorial improvements, the following major technical changes made in Part 1 also apply for Part 5: amendment of Japanese mains conditions with regard to the rated impulse v

15、oltages, the rationalized voltages and the nominal voltages of supply systems for different modes of overvoltage control; amendment of dimensioning of clearances smaller than 0,01 mm; alignment of the table and the corresponding formula regarding test voltages for verifying clearances at different a

16、ltitudes; amendment of interpolation of the creepage distance values for functional insulation; revision of the former Clause 4 “Tests and measurements“ (now Clause 6) to achieve a more detailed description of the tests and their purpose, the test equipment and possible alternatives. This standard i

17、s to be used in conjunction with EN 60664-1. NOTE For the purposes of this standard, all references to EN 60664-1 are written as “to Part 1”. Where a subclause is cited without reference to a part, it is assumed that the reference is to the current Part 5. The following dates were fixed: latest date

18、 by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2008-07-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2010-10-01 Annex ZA has been added by CENELEC. _ Endorsement not

19、ice The text of the International Standard IEC 60664-5:2007 was approved by CENELEC as a European Standard without any modification. _ EN 60664-5:2007 2 CONTENTS INTRODUCTION.5 1 Scope and object6 2 Normative references6 3 Terms and definitions .7 4 Fundamentals of clearance and creepage distance di

20、mensioning 7 4.1 Introductory remark .7 4.2 Basic principles .7 4.3 Voltages and voltage ratings8 4.4 Frequency .10 4.5 Time under voltage stress10 4.6 Pollution 10 4.7 Information supplied with the equipment 11 4.8 Insulating material .11 5 Requirements and dimensioning procedures .13 5.1 General .

21、13 5.2 Dimensioning of clearances .13 5.3 Dimensioning of creepage distances17 5.4 Requirements for design of solid insulation 22 6 Tests and measurements25 6.1 Tests.25 6.2 Measurement of creepage distances and clearances32 Annex A (informative) Dimensioning to maintain minimum insulation resistanc

22、e33 Annex B (normative) Water adsorption test.35 Annex C (informative) Dimensioning diagrams39 Annex D (informative) Withstand voltage test for creepage distance under humid conditions .42 Bibliography43 Figure 1 Test voltages31 Figure B.1 Layout of the test sample.36 Figure B.2 Test circuit 37 Figu

23、re B.3 Critical relative humidity of insulating materials 38 Figure C.1 Diagram for dimensioning clearances for circuits directly connected to the supply mains.39 Figure C.2 Diagram for dimensioning clearances for circuits not directly connected to the supply mains .40 Figure C.3 Diagram for dimensi

24、oning of creepage distances .41 Figure D.1 The arrangement for the withstand voltage test42 EN 60664-5:2007 3 Annex ZA (normative) Normative references to international publications with their corresponding European publications 44 Table 1 Relation between the humidity levels and macro-environmental

25、 classes .11 Table 2 Clearances to withstand transient overvoltages 14 Table 3 Clearances to withstand steady-state voltages, temporary overvoltages or recurring peak voltages.15 Table 4 Creepage distances to avoid failure due to tracking19 Table 5 Creepage distances to avoid flashover.20 Table A.1

26、Minimum insulation resistance 33 Table A.2 Creepage distances to maintain minimum insulation resistance.34 EN 60664-5:2007 4 INTRODUCTION This part of IEC 60664 specifies humidity levels regarding the effects of humidity on creepage distances. This part introduces the following dimensioning criteria

27、 which need to be taken into account: new minimum clearances having more precise values for dimensions up to 2 mm under pollution degrees 2 and 3 than those specified in Table F.2 of Part 1; smaller minimum creepage distances for printed wiring boards and equivalent constructions under pollution deg

28、ree 3 than those specified in Table F.4 of Part 1; a specification of minimum creepage distances to avoid flashover of the insulating surfaces, the values being based on the water adsorption characteristics of the material; a specification of minimum creepage distances to ensure adequate insulation

29、resistance under humid conditions. NOTE Table A.2 provides information on the dimensioning of creepage distances in order to maintain adequate insulation resistance for r.m.s. voltages up to 10 000 V, corresponding to creepage distances up to 250 mm. The information in this standard is based on rese

30、arch data published in 1989 1, 21. The following details from this research provide background information: the research was carried out on test samples that were manufactured using the same process as for printed wiring boards with spacing of circuit patterns from 0,16 mm to 6,3 mm; ten different m

31、aterials were used for the test samples. The influence of the manufacturing process on the surface of the material, e.g. moulding or machining, was not part of the research project; the test samples were placed in different locations, such as city, rural, industrial, desert, and coastal; the samples

32、 were periodically exposed to a voltage stress and the data accumulated over a long period of time. Annex B specifies a water adsorption test method for allocating unclassified insulating material to the relevant water adsorption group. This annex will be reviewed when further experience is gained u

33、sing the test method for different materials. 1Figures in square brackets refer to the bibliography. EN 60664-5:2007 5 INSULATION COORDINATION FOR EQUIPMENT WITHIN LOW-VOLTAGE SYSTEMS Part 5: Comprehensive method for determining clearances and creepage distances equal to or less than 2 mm 1 Scope an

34、d object This part of IEC 60664 specifies the dimensioning of clearances and creepage distances for spacings equal to or less than 2 mm for printed wiring board and equivalent constructions, where the clearance and the creepage distance are identical and are along the surface of solid insulation, su

35、ch as the paths described in 6.2 of Part 12(Examples 1, 5 and 11). The dimensioning in this standard is more precise than that provided by Part 1. However, if the precision provided by this standard is not required, Part 1 may be applied instead. This standard can only be used in its entirety. It is

36、 not permitted to select one or more clauses from this standard and to use them in place of the corresponding clauses of Part 1. In addition, this part of IEC 60664 can only be used together with Part 1. When this Part 5 is applied to the dimensioning of clearances and creepage distances equal to or

37、 less than 2 mm, all clauses are used in place of the corresponding clauses given in Part 1. For clearances and creepage distances larger than 2 mm, and for solid insulation in general, Part 1 applies. NOTE 1 The limitation to distances equal to or less than 2 mm applies to basic or supplementary in

38、sulation. The total distance of a reinforced or double insulation may be larger than 2 mm. This standard is based on the following criteria for dimensioning: minimum clearances independent of the micro-environment (see Table 2); minimum creepage distances for pollution degrees 1, 2 and 3 to avoid fa

39、ilure due to tracking (see Table 4); minimum creepage distances to avoid flashover across the insulating surface (see Table 5). NOTE 2 For minimum creepage distances to maintain adequate insulation resistance, see Table A.2. NOTE 3 This standard is not applicable to micro-environmental conditions wo

40、rse than pollution degree 3 or humidity level 3. A test method is specified for allocating unclassified insulating material to the relevant water adsorption group. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references,

41、only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. Clause 2 of Part 1 is applicable, as well as the following: 2“Part 1” refers to IEC 60664-1. EN 60664-5:2007 6 IEC 60364-5-51:2005, Electrical installations of bu

42、ildings Part 5-51: Selection and erection of electrical equipment Common rules IEC 60664-1:2007, Insulation coordination for equipment within low-voltage systems Part 1: Principles, requirements and tests IEC 60721-3-3:1994, Classification of environmental conditions Part 3-3: Classification of grou

43、ps of environmental parameters and their severities Stationary use at weatherprotected locations IEC 60721-3-7:1995, Classification of environmental conditions Part 3-7: Classification of groups of environmental parameters and their severities Portable and non-stationary use IEC 60721-3-9:1993, Clas

44、sification of environmental conditions Part 3-9: Classification of groups of environmental parameters and their severities Microclimates inside products 3 Terms and definitions For the purposes of this document, the following terms and definitions, in addition to those given in Part 1, apply. 3.1 wa

45、ter adsorption capability of insulating material to adsorb water on its surface 3.2 critical relative humidity value of the relative humidity when the impulse withstand voltage of a creepage distance has dropped to 95 % of the value that was measured at 70 % relative humidity 4 Fundamentals of clear

46、ance and creepage distance dimensioning 4.1 Introductory remark The first publication on this subject was IEC 60664, 1980. It only covered clearances, the data being based on fundamental data of breakdown voltages. Subsequently, in 1981 IEC 60664A was published concerning creepage distances based on

47、 data obtained over many years of experience, as well as data obtained from testing printed wiring boards. In 1992, the publications were combined and published as IEC 60664-1 (Part 1). However, the revision did not change the basic data. 4.2 Basic principles Insulation coordination implies the sele

48、ction of the electric insulation characteristics of the equipment with regard to its application and in relation to its surroundings. Insulation coordination can only be achieved if the design of the equipment is based on the stresses to which it is likely to be subjected during its anticipated life

49、time. Subclause 4.2 of Part 1 is applicable if not specified otherwise below. EN 60664-5:2007 7 4.2.5 Insulation coordination with regard to temporary overvoltage Insulation coordination with regard to temporary overvoltages is based on the temporary overvoltage specified in Clause 442 of IEC 60364-4-44 (see 5.4.3.2.3 of this Part 5). NOTE Currently available surge protective devices (SPDs) are not able to adequately deal with the en