1、BRITISH STANDARD BS EN 60721-1:1996 IEC 721-1: 1990 (Incorporating Amendment 1:1992 and Amendment2:1995) Classification of environmental conditions Part 1: Environmental parameters and their severities The European Standard EN 60721-1:1995 together with amendment A2 July1995 has the status of a Brit
2、ish StandardBSEN60721-1:1996 This British Standard, having been prepared under the directionof the Electrotechnical Sector Board, was published underthe authority of the Standards Board and comes intoeffect on 15 January 1996 BSI 07-1999 The following BSI references relate to the work on this standa
3、rd: Committee reference GEL/50 Special announcement in BSINews July 1991 ISBN 0 580 25200 0 Committees responsible for this British Standard The preparation of this British Standard was entrusted by Technical Committee GEL/50, Environmental testing, to panel GEL/50/-/1, Coordination of IEC/TC 75 wor
4、k, upon which the following bodies were represented: Federation of the Electronics Industry Society of Motor Manufacturers and Traders Limited Amendments issued since publication Amd. No. Date CommentsBSEN60721-1:1996 BSI 07-1999 i Contents Page Committees responsible Inside front cover National for
5、eword ii Foreword 2 Text of EN 60721-1 3 List of references Inside back coverBSEN60721-1:1996 ii BSI 07-1999 National foreword This Part of BS EN60721 has been prepared by Technical Committee GEL/50 and is the English language version of EN 60721-1:1995 Classification of environmental conditions Par
6、t1: Environmental parameters and their severities, and its amendment A2:1995. Text affected by amendmentA2 is indicated by a double sideline in the left-hand margin. This Part of BS EN60721 is identical with IEC 721-1:1990 including Amendment 1:1992 and Amendment2:1995, published by the Internationa
7、l Electrotechnical Commission (IEC). This standard supersedes BS7527-1:1991 which is withdrawn. References in the text to IEC page numbers should be ignored. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for thei
8、r correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Cross-references Publication referred to Corresponding British Standard EN 60068-2-27:1993 (IEC 68-2-27:1987) BS EN60068 Environmental testing Part 2 Test methods Section 27:1993 Envi
9、ronmental testing procedures. Tests. Test Ea and guidance. Shock EN 50014:1992 BS EN 50014:1992 Electrical apparatus for potentially explosive atmospheres. General requirements HD 478.2.2 S1 (IEC 721-2-2:1988) BS 7527 Classification of environmental conditions Part 2 Environmental conditions appeari
10、ng in nature Section 2.2:1991 Precipitation and wind EN 60721-3-6:1993 (IEC 721-3-6:1987) BS EN 60721 Classification of environmental conditions Part 3 Classification of groups of environmental parameters and their severities Section 6:1993 Ship environment ISO 2041:1990 BS 3015:1991 Glossary of ter
11、ms relating to mechanical vibration and shock Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, theEN title page, pages2 to 20, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorpor
12、ated. This will be indicated in the amendment table on the inside front cover.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 60721-1 + A2 April 1995 UDC 621.3:620;193 ICS 19.040 Supersedes HD 478.1 S2:1994 Includesamendment A2 July 1995 Descriptors: Electronic component, electrotechnical compo
13、nent, electrical material, storage condition, using condition, environment, atmosphere English version Classification of environmental conditions Part1:Environmental parameters and their severities (IEC 721-1:1990 + A1:1992 + A2:1995) Classification des conditions denvironnement Partie 1: Agents den
14、vironnement et leurs svrits (CEI 721-1:1990 + A1:1992 + A2:1995) Klassifizierung von Umweltbedingungen Teil1: Vorzugswerte fr Einflugren (IEC 721-1:1990 + A1:1992 + A2:1995) This European Standard was approved by CENELEC on 1995-03-06. CENELEC members are bound to comply with the CEN/CENELEC Interna
15、l Regulations which stipulate the conditions for giving this European Standard the status of a national standard 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 memb
16、er. This European Standard exists in three official versions (English, French, German). A version in any other 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
17、 members are the national electrotechnical committees of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CENELEC European Committee for Electrotechnical Standardization Com
18、it Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B-1050 Brussels 1995 Copyright reserved to CENELEC members Ref. No. EN 60721-1:1995 EEN60721-1:1995 BSI 07-1999 2 Foreword The text of the International Standard IEC
19、 721-1:1990 and its amendment 1:1992, prepared by IEC TC 75, Classification of environmental conditions, was approved by CENELEC as HD 478.1 S2 on 1994-03-08. This Harmonization Document was submitted to the formal vote for conversion into a European Standard and was approved by CENELEC as EN60721-1
20、 on 1995-03-06. The following date was fixed: Annexes designated “normative” are part of the body of the standard. In this standard, Annex ZA is normative. Annex ZA has been added by CENELEC. Foreword to amendment A2 The text of document 75/223/DIS, future amendment 2 to IEC 721-1:1990, prepared by
21、IECTC 75, Classification of environmental conditions, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as amendment A2 to EN 60721-1:1995 on 1995-07-04. The following dates were fixed: Contents Page Foreword 2 Introduction 3 1 Scope 3 2 Normative references 3 3 Definitions
22、3 4 Environmental factors and parameters 4 Annex ZA (normative) Other international publications quoted in this standard with the references of the relevant European publications 20 Figure 1 Model spectra for sinusoidal vibration 18 Figure 2 Model spectra for random vibration 19 Figure 3 Model shock
23、 response spectra (first order maximax shock response spectra) 19 Table 1 5 latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 1996-03-01 latest date by which the amendment has to be implemented at national lev
24、el by publication of an identical national standard or by endorsement (dop) 1996-04-01 latest date by which the national standards conflicting with the amendment have to be withdrawn (dow) 1996-04-01EN60721-1:1995 BSI 07-1999 3 Introduction This part of IEC721 contains a list of environmental parame
25、ters and their severities. It replaces the first edition of IEC721-1, which was issued as an IEC Report pending the results of work in IEC Technical Committee No. 75 and other IEC Technical Committees on defining the environmental conditions to which products will be subjected while being transporte
26、d, stored, installed and used. The modifications made have been mainly concerned with the list of severities. The severities in this part are given without reference to their application. Sufficient guidance on application is available in IEC 721-2 and IEC721-3. Technical Committees preparing enviro
27、nmental condition specifications for products should apply IEC721-3 but if, in exceptional cases, severity values of IEC721-3 are not appropriate, the list in this part should be considered for the selection of values. 1 Scope This part of IEC721 lists environmental parameters and a limited number o
28、f their severities within the range of conditions met by electrotechnical products when being transported, stored, installed and used. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this part of IEC721. At the time of
29、 publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this part of IEC721 are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain register
30、s of currently valid International Standards. IEC 68-2-27:1987, Environmental testing Part2:Tests Test Ea and Guidance: Shock. IEC 79-0:1983, Electrical apparatus for explosive gas atmospheres Part 0: General requirements. IEC 721-2-2:1988, Classification of environmental conditions Part 2: Environm
31、ental conditions appearing in nature Precipitation and wind. IEC 721-3-6:1987, Classification of environmental conditions Part 3: Classification of groups of environmental parameters and their severities Ship environment. ISO 2041:1975, Vibration and shock Vocabulary. 3 Definitions For the purposes
32、of this part of IEC721, the following definitions apply: 3.1 environmental condition physical, chemical or biological condition, external to a product, to which it is subjected at a certain time NOTEEnvironmental conditions are generally composed of environmental conditions appearing in nature and e
33、nvironmental conditions generated by the product itself or by external sources. 3.2 environmental factor a physical, chemical or biological influence which, either singly or in combination with other influences, produces an environmental condition (e.g.heat, vibration) 3.3 environmental parameter on
34、e or more physical, chemical or biological properties characterizing an environmental factor (e.g.temperature, acceleration) EXAMPLE The environmental factor vibration is characterized by the parameters: type of vibration (sinusoidal, random), acceleration and frequency 3.4 severity of environmental
35、 parameter a value of each quantity, characterizing the environmental parameter EXAMPLE The severity of sinusoidal vibration is defined by values of the acceleration (in m/s 2 ) and frequency (in Hz) 3.5 application, product application a condition or a situation, met by a product EXAMPLES of applic
36、ations Office working rooms, steelworks, ground transport. Applications do not refer to a class of products (puters) 3.6 group of environmental parameters and their severities a set of environmental conditions characteristic for a specific use or purposeEN60721-1:1995 4 BSI 07-1999 4 Environmental f
37、actors and parameters 4.1 General The actual environmental conditions to which a product is exposed are normally complex and composed of a number of environmental factors and corresponding parameters. When defining the environmental conditions for a certain product application, it is therefore neces
38、sary to: list the environmental factors involved; select appropriate severities for each parameter. The environmental influences on a product in a certain application is a result of: conditions of the surrounding medium, normally air or water (in certain cases, soil); conditions of the structure to
39、which the product is connected; influences from external sources or activities. When selecting environmental factors and parameters for a certain product application it is therefore necessary to check these conditions and influences for single, combined and sequential environmental factors as they o
40、ccur. The terms for the environmental factors and parameters correspond in general to those used in IEC 68, as far as applicable. 4.2 List of single environmental factors and parameters and their severities. The list of environmental factors and parameters given in Table 1 shall be used: as a check
41、list to ensure that relevant factors and parameters have been considered; to achieve uniformity in the description of the environment. The severities given in connection with each parameter in Table 1 shall be used for standardization purposes. These are restricted to the severities of the environme
42、ntal conditions to which a product may be exposed. It is not intended to cover the severities of the resulting stresses on the product. For example, the severities are intended to cover the temperatures of surrounding media (e.g.air, water, soil, water vapour, ice, oil, etc.) and the temperatures of
43、 the structure to which the product is connected, but are not intended to cover the temperatures of hot points on the product itself. The severities are primarily related to limit environmental conditions, and do not include conditions for reference measurements, calibration, etc. 4.3 Combined envir
44、onmental factors A product is exposed simultaneously to a number of environmental factors and corresponding parameters. The effect of a combination of environmental factors is especially important when exposure to a combined environment affects the product differently from exposure to a sequence of
45、environmental factors. When selecting environmental factors for a certain product application it is therefore recommended to check the environmental factors, the combination of which may need to be taken into account. 4.4 Sequences of environmental factors Certain effects of exposing a product to en
46、vironmental conditions are a direct result of exposing it to two or more factors or parameters in a direct sequence. Two important examples are: thermal shock, which may be the result of exposing the product to high temperature conditions immediately after it has been exposed to low temperature cond
47、itions or vice versa, or by subjecting the product to water (rain, water jets, sea waves, immersion) directly after being exposed to high temperature conditions; formation of ice, which may be the result of exposing the product to conditions of temperatures below freezing point immediately before or
48、 after it has been exposed to humidity, rain or water from sources other than rain. It is recommended that these possibilities be taken into account when defining the environmental conditions to which a certain product will be exposed.EN60721-1:1995 BSI 07-1999 5 Table 1 a Item No. Environmental fac
49、tor Environmental parameter and unit Severity (see note 1) Code of condition (see note 2) Remarks A W S E 1 Climatic conditions 1.1 Cold and heat 1.1.1 Temperature, C 80 65 55 50 + 40 33 + 25 20 15 5 Freezing point of water + 5 + 10 + 15 + 20 + 25 + 30 + 35 + + 40 + 45 + 50 + 55 + 60 + 70 + 85 + 100 + 125 + 155 + 200 x x x + Severity derived from climatograms relevant to specific open-air types of climate This severity refers only to water, not to air or structures (see IEC 721-3-6)
