1、- CENELEC EN*b072L-L 95 3404583 0366357 OOT BRITISH STANDARD Classifcation of environmental conditions Part 1. Environmental parameters and their severities The European Standard EN 60721-1 : 1995 together with amendment A2 July 1995 has the status of a British Standard Product code 006.12194 BS EN
2、60721-1 : 1996 IEC 721-1 1990 (Iricarporuting Amendment 1 : 1992 and Amendment 2 .1995) COPYRIGHT European Committee for Electrotechnical StandardizationLicensed by Information Handling Services - CENELEC EN*b0721-1 95 3404583 0166358 T4b BS EN 60721-1 : 1996 This British Standard, having been prepa
3、red under the direction of the Electrotechnical Sector Board, was published under the authority of the Standards Board and comes into effect on 15 January 1996 O BSI 1996 Committees responsible for this British Standard The preparation of this British Standard was entrusted by Technical Committee GE
4、U50, Environmental testing, to panel GEU50/-/1, Coordination of IEClTC 75 work, upon which the following bodies were represented Federation of the Electronics Industry Society of Motor Manufacturers and iladers Limited Amendments issued since publication Amd.No. ID* I Text affected The following BSI
5、 references relate to the work on this standard Committee reference GEU5O Special announcement in BSINews July 1991 ISBN O 580 25200 O COPYRIGHT European Committee for Electrotechnical StandardizationLicensed by Information Handling Services- - - CENELEC EN*b072L-L 75 m 3404583 0366359 982 H BS EN 6
6、0721-1 : 1996 Contents Committees responsible Inside front cover National foreword ii Forewords 2 Text of EN 60721-1 3 O BSI 1996 i COPYRIGHT European Committee for Electrotechnical StandardizationLicensed by Information Handling Services CENELEC EN*b072L-L 95 m 3404583 03bb3bO bT4 m BS EN 60721-1 :
7、 1996 National foreword This Part of BS EN GO721 has been prepared by Technical Committee GEU50 and is the English language version of EN 60721-1 : 1995 Classification of mtromer/d conditions - Part 1. Enuirowmmtd poramtms and their seurn.tim, and its amendment A2 : 1995. Tex% affected by amendment.
8、 A2 is indicated by a double sideline in the left-hand margin. This Part of BS EN 60721 is identical with IEC 721-1 : 1990 including Amendment 1 : 1992 and Amendment 2 : 1995, published by the International Electrotechrucai Commission (IEC). “lus standard supersedes BS 7527 : Part 1 : 1991 which is
9、withdrawn. References in the text to IEC page numbers should be ignored. Cross-references Publication referred to EN 60068-2-27 : 1993 (IEC 68-2-27 : 1987) EN 50014 : 1992 HD 478.2.2 S1 (IEC 721-2-2 : 1988) EN 60721-3-6 : 1993 (IEC 721-3-6 : 1987) IS0 2041 : 1990 Corresponding British Standard BS EN
10、 60068 Environmcntal testing Part2 Testmethods Section 27 : 1993 Environmental testing procedures. Tcsts. Tcst Ea a,nd guidance. Shock BS EN 50014 : 1992 Elect?cal apparatus for potentially mplosive atmosphertrs. Gmm.al requremmts BS 7527 Classification of erivirorcwamtal conditions Part 2 Evironrnm
11、tal conditio% uppeaming in nature Section 2.2 : 1991 Precipitation, and wind BS EN 60721 Classification of environmentnl conditions Part 3 Classjficat7o.n qf g?-oups of mvironmcnktl parameters and th 193 ICs 19.040 Supersedes HD 478.1 S2 : 1994 Includes amendment A2 July 1995 Descriptors: Electronic
12、 component, electrotechnical Component, electrical material, storage condition, using condition, environment, atmosphere English version Classification of environmental conditions Part 1: Environmental parameters and their severities (IEC 721-1 : 1990 + Al : 1992 + A2 : 1995) Classification des cond
13、itions denvironnement Partie 1: Agents denvironnement et leurs svrits Klassiiiierung von Umweltbedingungen Teil 1: Vomgswerte fUr Einflu2grBen (IEC 721-1 : 1990 + Al : 1992 + A2 : 1995) (CE1 721-1 : 1990 + Al : 1992 + A2 : 1995) This European Standard was approved by CENELEC on 199503-06. CENELEC me
14、mbers are bound to comply with the CENXENELEC Internal 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 applicat
15、ion 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 language made by translation under the responsibility of a CENELEC member into its own language and notified to the Central Secretariat
16、has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Denmark, Finiand, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CENELEC Europe
17、an Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B-1050 Brussels O 1995 Copyright reserved to CENELEC members Ref. No. EN 60721-1 : 1995 E COPYRIGHT European Com
18、mittee for Electrotechnical StandardizationLicensed by Information Handling Services- - - CENELEC EN*b0721-L 75 W 3404583 OLbb3b2 Li77 Page 2 EN 60721-UA2 : 1995 Foreword The text of the International Standard IEC 721-1 : 1990 and its amendment 1 : 1992, prepared by IEC TC 75, Classification of envi
19、ronmental conditions, was approved by CENELEC as HD 478.1 S2 on 199403-08. This Harmonization Document was submitted to the formal vote for conversion into a European Standard and was approved by CENELEC as EN 60721-1 on 1995-0346. The following date was fixed - latest date by which the EN has to be
20、 implemented at national level by publication of an identical national standard or by endorsement (dop) 199603-01 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 docum
21、ent 75/223/DIS, future amendment 2 to IEC 721-1 : 1990, prepared by IEC TC 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 199507-04. The foliowing dates were fixed: - latest date by wh
22、ich the amendment has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 199604-01 latest date by which the national standards conflicting with the amendment have to be withdrawn (dow) 19960441 - Contents Introduction 1 Scope 2 Normative refe
23、rences 3 Definitions 4 Environmental factors and parameters Table 1 Climatic conditions Biological conditions Chemically active substances Mechanically active substances Contaminating fluids Mechanical conditions Electric and electromagnetic isturbance Figures Annex ZA (Normative) Other internationa
24、l publications quoted in this standard with the references of the relevant European publications Page 3 4 4 4 5 7 10 10 13 14 14 18 21 24 O BSI 1996 COPYRIGHT European Committee for Electrotechnical StandardizationLicensed by Information Handling Services CENELEC EN*b072L-L 95 = 3404583 0266363 303
25、Page 3 EN 60721-1 : 1995 INTRODUCTION This part of I E C 721 contains a list of environmental parameters and their severities. It replaces the fust edition of 1 E C 721-1, which was issued as an I E C Report pending the results of work in I E C chnical Committee No. 75 and other I EC Technical Commi
26、ttees on defining the environmental con- ditions to which products will be subjected while being transported, stored, instailed 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. Suffi
27、cient guidance on applica- tion is available in IEC 721-2 and IEC 721-3. Iechnical Committees preparing environmental condition specifications for products should apply I E C 721-3 but if, in exceptional cases, severity values of IEC 721-3 are not appropriate, the list in this part should be conside
28、red for the selection of values. COPYRIGHT European Committee for Electrotechnical StandardizationLicensed by Information Handling ServicesCENELEC EN*b0721-1 75 3404583 OLbb3b4 24T Page 4 EN 60721-1 : 1995 CLASSIFICATION OF ENVIRONMENTAL CONDITIONS Part 1: Environmental parameters and their severiti
29、es 1 Scope This part of IEC 721 lists environmental parameters and a limited number of their seventies within the range of conditions met by electrotechnical products when being transported, stored, installed and used. 2 Normaive references The following standards contain provisions which, through r
30、eference in this text, constitute provisions of this part of IEC 721. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this part of IEC 721 arc encouraged to investigate the possibility of applying the most recen
31、t editions of the standards indicated beiow. Members of IEC and IS0 maintain registers of currently valid International Standards. LEC 68-2-27; 1987, EnViratal taw. Pan 2: %U - Tat Ea ad Guidan=: Shodr. IEC 794): 1983, Eleurical apparatus for aplosive gas atmospheres - Part O: General re-quiremaits.
32、 LEC 721-2-2: 1988, Classification of environmental conditions - part 2: Environmental conditions appearing in nature - - 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, norma
33、lly air or water (in certain cases, soil); - conditions of the structure to 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
34、infiuences for single, combined and sequential environmental factors as they occur. The terms for the environmental factors and parameters correspond in general to those used in I E C 68, as far as applicable. COPYRIGHT European Committee for Electrotechnical StandardizationLicensed by Information H
35、andling ServicesPage 6 EN 60721-1 : 1995 4.2 Lht 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 list to ensure that relevant factors and parameters have been considered; - to achieve u
36、niformity in the description of the environment. The severities given in connection with each parameter in table 1 shall be used for standardization pur- poses. These are restricted to the seventies of the environmental conditions to which a product may be exposed. It is not intended to cover the se
37、verities of the resulting stresses on the product. For example, the severities are intended to cover the temperatures of surrounding media (eg. air, water, soil, water vapour, ice, oii, etc) and the temperatures of the structure to which the product is connected, but are not intended to cover the te
38、mperatures of hot points on the product itself. The seventies are primarily related to limit environmental conditions, and do not include conditions for reference measurements, calibration, etc 4.3 Combined environmental factors A product is exposed simultaneously to a number of environmental factor
39、s and corresponding parameters. The effect of a combination of environmental factors is especially important when exposure to a combinai environment affects the product differently from exposure to a sequence of environmental factors. When selecting environmental factors for a certain product applic
40、ation 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 environmental conditions are a dnect result of exposing it to two or more factors or param
41、eters in a direct sequence. no 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 conditions or vice versa, or by subjecting the product to water (rain, water jets, sea waves
42、, 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 after it has been exposed to humidity, rain or water from sources other than rain. I
43、t is recommended that these possibilities be taken into account when defining the environmental condi- tions to which a certain product will be exposed. COPYRIGHT European Committee for Electrotechnical StandardizationLicensed by Information Handling ServicesCENELEC EN*b072L-L 95 3404583 0166367 T59
44、 Page 7 EN 60721-1 : 1995 1.1.1 Bble 1+ Temperature. “C Environmenlol factor and unit Climatic conditions Sevaity (sa note I) 1.1 cold and haar -80 - 65 - 55 -so+ -40 -33+ -25 - 20 - 15 -5 Freezing point of water +5 + 10 + 15 +20 +25 + 30 +35+ +40 + 45 + 50 + 55 +a + 70 + 85 + Iu) + I25 + 155 +m o,
45、1 0.5 1 3 5 10 I 5 Code of condition (sec Ilote 2) Remarks + Seventy derived from climatograms rei- cvant to specific open-air types of climate This severity refers only to water, not to au or structures (see IEC 721-3-6) As mentioned in 4.4, a produa can be sub- jead to temperature shocks when it i
46、s moved from one medium to another (e.g. from out- doors to indoors) or when it is subjected to a medium of a temperature other than the tan- perature of the product (c.p. when subjected to rain, water jets). The parameters definin8 the severity of the temperature shock shall then be chosen from the
47、 list of temperature (air rem- peratwe. water temperature). either as a single environmental parameter or combined with movement of the surrounding medium For notes, see pages 37 to 41. COPYRIGHT European Committee for Electrotechnical StandardizationLicensed by Information Handling ServicesCENELEC
48、EN*b072L-L 95 3404583 0366368 995 Page 8 EN 60721-1 : 1995 Iabie 1+ (continued) 1.2.1 1.2.2 Rdative humidity, C Absolute humidity. g/m (water content) 11.3 Pnzsnm 1.3.1 1.3.2 1.3.3 Mty (sec note 1) 4 5 10 15 20 50 75 85 95 100 0.003 0.02 0,03 O. 1 0,26 0.5 0b9 1 2 4 15 22 25 29 35 36 48 60 62 78 80
49、Air pressure, kPa Water prasure, kPa Rate of change of pressure, kPa/s 20 30 53 70 84 106 130 200 Hw) 1m 5m 30m o. 1 1 Code of condition (soe note 2) Remarks The effect of humidity on a product is always theeffect of a combination of relative humidity with other environmental parameters, primar- ily temperature and change of temperature he seventia are derived from ciimatograms relevant to specific open-air typa of climate For notes. KC pages 37 u) 41. COPYRIGHT European Committee for Electrotechnical StandardizationLic
