HD-625.1-S1-1996.pdf
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1、* * r n HARMONIZATION DOCUMENT HD 625.1 S1 DOCUMENT DHARMONISATION HARMONISIERUNGSDOKUMENT September 1996 ., ICs 29.046.20 English version Insulation coordination for equipment within low-voltage systems Part 1 : Principles, requirements and tests (IEC 664-1 : 1992, modified) Coordination de lisolem
2、ent des mattWels dans les Systemes (reseaux) B basse tension Partie 1 : Principes, prescriptions et essais (CE1 664-1 : 1992, modifitle) lsolationskoordination fr elektrische Betriebsmittel in Niederspannungsanlagen Teil 1 : Grundstze, Anforderungen und Prfungen (IEC 664-1 : 1992, modifiziert) This
3、Harmonization Document was approved by .CENELEC on 1996-03-05. CENELEC members are bound to comply with the CENXENELEC Internal Regulations which stipulate the conditions for implementation of this Harmonization Document on a nationai level. Up-to-date lists and bibliographical references concerning
4、 such national imOlementation may be obtained on application to the Central Secretariat or to any CENELEC member. This Harmonization Oocument exists in three official versions (English, French, German). CENELEC members are the national electrotechnical committees of Austria, Belgium, Denmark, Finlan
5、d, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain. Sweden, Switzerland and United Kingdom. CENELEC European Committee for Electrotechnical Standardization Comite Europeen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische No
6、rmung Central secretariat: rue de Stassart 35, B - 1050 Brussels Ref. No. HO 625.1 S1:1996 E Page 2 I HO 625.1 S1:1996 Foreword The text of the International Standard IEC 664-1 : 1992, prepared by SC 28A, Insulation coordination for low-voltage equipment, of IEC TC 28, Insulation coordination, toget
7、her with common modifications prepared by the Technical Committee CENELEC TC 28A, Insulation coordination for low-voltage equipment, was submitted to the formal vote and was approved by CENELEC as HD 625.1 S1 on 1996-03-05. The following dates were fixed: - latest date by which the existence of the
8、HD has to be announced at national level (doa) 1996-09-01 - latest date by which the HO has to be implemented at national level by publication of a harmonized national standard or by endorsement (dop) 1997-03-01 with the HD have to be withdrawn (daw) 1997-03-01 For products which have complied with
9、the relevant national standard before 1997-03-01, as shown by the manufacturer or by a certification body, this previous standard may continue to apply for production until 2002-03-01. Annexes designated “normative“ are part of the body of the standard. Annexes designated “informative“ are given for
10、 information only. In this standard, annex ZA is normative and annexes A, 8, C, and D are informative. Annex ZA has been added by CENELEC. - latest date by which the national standards conflicting -,-,- Page 3 HO 625.1 S1:1996 Endorsement notice The text of the International Standard IEC 664-1 :1992
11、 was approved by CENELEC as a Harmonization Document with agreed common modifications as given below. COMMON MOOlFlCATlONS 1.3.10 Overvoltage category A numeral defining an impulse withstand level. , No change in the note. 2.2 Voltages and voltage ratings Second alinea: Instead of “an overvoltage ca
12、tegory according .,.I Read “an impulse withstand category (overvoltage category) .“ 2.2.2.1 Impulse withstand categories (overvoltage categories) Impulse withstand categories are means to distinguish different degrees of availability of equipment with regard to required expectations on continuity of
13、 service and on an acceptable risk of failure. By selection of impulse withstand levels of equipment, insu- lation coordination can be achieved in the whole installation, reducing the risk of fail- ure to an acceptable level providing a basis for overvoltage control. at l n * A higher characteristic
14、 numeral of an impulse withstand category indicates a higher specific -impulse withstand of. the equipment and offers a wider choice of methods for ovewoltag control. 1. . The concept of impulse withstand categories is used for equipment energised directly from the mains. The application of impulse
15、withstand categories is based on the re- quirement with regard to additional protection against overvoltages as specified in IEC 364-4443. NOTE: Overvoltages of atmospheric origin are not significantly physically attenuated down- stream in most installations. Investigations have shown that the conce
16、pt of a probabilistic ap- proach has proven reasonable and useful. 2.2.2. t. 1 Equipment energised directly from the low-voltage mains Specification of a specific impulse withstand category (overvoltage category) shall be based on the following general explanation: - Equipment of impulse withstand c
17、ategory I is equipment which is intended to be connected to the fixed electrical installations of buildings. Protective means are taken outside the equipment - either in the fixed installation or between the fixed in- stallation and the equipment - to limit transient overvoltages to the specific lev
18、el. - Equipment of impulse withstand category II is equipment to be connected to the fixed electrical installations of buildings. NOTE: Examples of such equipment are household appliances, portable tools and similar loads. -,-,- Page 4 HD 625.1 S1:1996 - Equipment of impulse withstand category Ill i
19、s equipment which is part of the fixed electrical installations and other equipment where a higher degree of availability is expected. NOTE: Examples of such equipment are distribution boards, circuit breakers, wiring systems (IEV 826-06-01, including cables, bus-bars, junction boxes, switches. sock
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