1、BRITISH STANDARD Classification of environmental conditions Part 3. Classification of groups of environmental parameters and their severities Section 3.4 Stationary use at non-weatherprotected locations The European Standard EN 6072134 : 1995 has the status of a British Standard ICs 19.040 NO COPYIN
2、G WITHOUT BSI PERMISSION EXCEPT AS PERMI”FCD BY COPYRIGHT LAW BS EN 60721-3-4 : 1996 lEC 721-3-4 : 1995 STD-BSI BS EN b0721-3-i-ENGL 1975 1b24bb9 Ob237bB 025 BS EN 607213-4 : 1995 Issue 2, June 1997 Committees responsible for this British Standard “he preparation of this British Standard was entnist
3、ed by Technical Committee GEY50, to panel GEUEO/Jl, Coordination of IECITC 75 work, upon which the following bodies were represented: Federation of the Electronics Industry Society of Motor Manufixtureis and Traders Limited This iMtish Standard, having been prepared under the direction of the Electr
4、otechnical Sector Board, was pubiished under the authority of the Standards Board and comes into effect on 15 June 1995 O BSI 1997 Amendments issued since publication I Amd No. I Text affected The foilowing BSI references relate to the work on this standard: Conmittee reference GEI/SO Draft for comm
5、ent 93/209314 DC ISBN O 680 24184 X STD-BSI BS EN b0721-3-q-ENGL 1775 1b2LibbS 0623769 TbL H Page Front cover Inside front cover a b ii EN title page 2 3 4 5 6 7 1 Issue 1, June 1997 BS EN 607213-4 : 1995 sh. Issue Page 2 8 2 9 1 10 to 18 blank 19 Original 20 2 21 to 25 2 26 2 27 2 28 Original 29 Or
6、iginal 30 2 Inside back cover Original Back cover Summary of pages The following table identifies the current issue of each page. Issue 1 indicates that a page has been introduced for the first time by amendment. Subsequent issue numbers indicate an updated page. Vertical sidelining on replacement p
7、ages indicates the most recent changes (amendment, addition, deletion). Issue Original 2 Original 2 2 original 2 1 1 1 blank 2 original 0 BSI 1997 STD-BSI BS EN b072L-3-4-ENGL 1995 lb24bb7 0b23770 783 W BS EN 60721-3-4 : lW5 Contents Committees responsible National foreword page inside front cover i
8、i Foreword Text Of EN 60721-3-4 2 3 i STD*BSI BS EN b0722-3-V-ENGL 1775 Lb24bb7 Ob2377L bLT BS EN 607213-4 : 1995 Issue 2, June 1997 .- National foreword This Section of BS EN 60721 has been prepared by Technical Committee GEMO and is the English language version of EN 60721-3-4 : 1995 Classkatiion
9、of mzrironmtu conditions Part 3: Clossification of pups of environmental parameiem and wir sewrit2es Section 4: Stationary use at non-weatherprotecte locations including amendment Al : 1997, published by the European Committee for Electrotechnical Standardization (CENELEC). It is identical with IEC
10、721-3-4 : 1995, including Amendment 1 : 1996, published by the international Electrotechnicai Commission (EX). This British Standard supersedes BS EN 60721-3-4 : 1993 which is withdrawn. Cross-references Publication referred to EN 6072150 : 1993 (IEC 72150 : 19%) Corresponding British Standard BS EN
11、 60721 Classifikation of environmental conditions Part 3. Classifikation of groups of enviranmental paranaetmi and their severities Section 3.0 : 1993 Intmductwn BS 7527 Classication of enwmnmental conditions Part 1.1991 Enwimmtal pammters ancl their Part 2. Environmental conditiuns appearing in nat
12、ure Section 1 : 1991 lbnpemture and humidity HD 478.1 S2 HD 478.2 S1 (IEC 721-2-1 : 1982) (IEC 721-1 : 1990) seuerities Compliance with a British Standard does not of itself confer immunity from legal obligations. ii Q BSI 1997 EUROPEAN STANDARD Nom EUR0PEE”E EUROP i I h s O 1995 Copynght reserved t
13、o CENELEC members Ref. No. EN 607213-4 : 1995 + Al : 1997 E - STD.BS1 BS EN b072L-3-g-ENGL 1995 = Lb24bb9 b23773 492 Page 2 Issue 2, June 1997 1 EN 60721-3-4 : 1995 Foreword The text of the document 75(C0)103A, future amendment to iEC 72134 : 1987, prepared by IEC 75, Classification of environmental
14、 conditions, was submitted to the IEGCENELEC parallel vote and was approved by CENELEC as amendment A3 to EN 60721-34 : 1993 in 1994-1044. The text of this document, together with that of IEC 721-3-4 : 1987 and its amendments 1 : 1991 and 2 : 1993, was published by IEC as the second edition of DEC 7
15、21-3-4 in January 1995. According to a decision of principle taken by the Technid Board of CENELEC, the approval of EN 6072154 : 1993A3 has been converted into the approval of a new EN 6072134. The foilowing dates were fixed - latestdatebywhichthe EN has to be implemented at national level by public
16、ation of an identical national standard or by endorsement (dop) 1141 - iatestdatebywhichthe national standards conflicting with the EN have to be withdrawn (dow) 1996-01-01 Annexes designated normative are part of the body of the standard. Annexes designated informative are given for information onl
17、y. In this standard, annex ZA is normative and annexes A, B, C and D are informative. Annex ZA has been added by CENELEC. Foreword to amendment A2 The text of document 75/280/FDIS, future amendment 1 to IEC 721-3-4 : 1995, prepared by IEC TC 75, Classification of environmental conditions, was submit
18、ted to the IEGCENELEC parallel vote and was approved by CENELEC as amendment Al to EN 607213.4 : 1995 on 1996-12-09. The foilowing dates were fixed: - latestdatebywhichthe EN has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 19974901 - l
19、atestdatebywhichthe national standards conflicting with the EN have to be withdrawn (dow) 1997-0901 I. . .d. . , .x: I O BSI 1997 l i - STD-BSI BS EN b0721-3-4-ENGL 1775 1b24bb7 Ob23774 327 M Issue 2, June 1997 Page 3 EN 60721-34 : 1995 CONTENTS Scope . - . - . 4 Normative references . 4 Definitions
20、 ._._._-.-.-. - .-. 5 General . 5 Classification of groups of environmental parameters and their severities 6 Sets of environmental condition class combinations . 8 Tables 9 Figure . . 1 3 Annexes A Survey of condiiions affecting the choice of environmental parameters and theu seventes 14 6 Interdep
21、endence of air temperature, relative humidity and absolute humidity . 21 C Examples for practical application of the classification specified in this standard .- 23 O Summary of condlions covered by sets of class combinations . . -. .- 2 5 E (informative) Explanation of the environmental conditions
22、in tropical areas as specified in classes 4K5 and 4K6 26 ZA (normative) Other international publications quoted in this standard with the references of the relevant European publications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . , . . . . . . . . , . 30 O BSI 1997 STD-BSI BS EN b0721
23、-3-9-ENGL 1775 Lb29bb7 Ob23775 265 W I page 4 1 I I EN 60721-3-4 : 1995 CLASSIFICATION OF ENVIRONMENTAL CONDITIONS - Part 3: Classification of groups of environmental parameters and their severities - Section 4: Stationary use at non-weatherprotected locations 1 Scope This section of IEC 721-3 class
24、ifies groups of environmental parameters and their severities to which products are subjected when mounted for stationary use at locations which are non-weatherprotected, including periods of erection work, downtime, mainte- nance and repair. -= Locations which are non-weatherprotected, where produc
25、ts may be mounted for stationary use permanently or temporarily, include land-based and offshore locations. Use in and on vehicles is excepted. The environmental conditions specified in this standard are limited to those which may directly affect the performance of products. Only environmental condi
26、tions as such are considered. No special description of the effects of these conditions on the products is given. Environmental conditions directly related to fire or explosion hazards and conditions ?+fated to ionizing radiation are excluded. Any other unforeseen incidents are also 3uded. The possi
27、bility of their occurrence should be taken into account in special -Ases. Microclimate within a product is not included. Conditions of stationary use at weatherprotected locations, portable and non-stationary use, use in vehicles and ships, and conditions of storage and transportation are given in o
28、ther sections of IEC 721-3. 7,. fr. - A limited number of classes of environmental conditions is given, covering a broad field of application. The user of this standard should select the lowest classification necessary for covering the conditions of the intended use. Some guidance for this is given
29、in annex A. 2 Normative references The foilowing normative documents contain provisions which, through reference in this text, constitute provisions of this section of IEC 721-3. At the time of publication, the editions indicated were valid. All normative documents are subject to revision, and parti
30、es to agreements based on this section of IEC 721-3 are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. Members of IEC and IS0 maintain registers of currently valid International Standards. Page Fi EN 60721-3-4 1495 IEC 721 -
31、1 : 1990, Classification of environmental conditions - Patt 1: Environmental parameters and their severities Amendment 1 (1992) IEC 721 -2-1 : 1982, Classification of environmental conditions - Part 2: Environmental conditions appearing in nature - Section I: Temperature and humidity Amendment 1 (19
32、87) 1EC 721 -3-0: 1984, Classification of environmental conditions - Part 3: Classification of groups of environmental parameters and their severities - Section O: Introduction Amendment 1 (1987) 3 Definitions In addition to the definitions in clause 3 of IEC 721 -1, the following definitions apply
33、to this standard: 3.1 stationary use: The product is mounted firmly on the structure or on mounting devices, or it is permanently placed at a certain site. It is not intended for portable use, but short periods of handling during erection work, downtime, maintenance and repair at the location are in
34、cluded. 3.2 locatlon which is non-weatherprotecte: A location at which the product is not protected from direct weather influences. 4 General For further general guidance, see IEC 721 -3-0. During periods of erection work, which are often connected with downtime, the user should be aware that condit
35、ions might differ from those during operation. Therefore, the selection of another class may be necessary for this period. unless special precautions have been taken. The severities specified are those which will have a low probability of being exceeded. All specified values are maximum or limit val
36、ues. These values may be reached, but do not occur permanently. Depending on the local situation, there may be different frequencies of occurrence related to a certain period of time. Such frequencies of occurrence have not yet been included in this standard, but should be considered for any environ
37、mental parameter. They should be specified additionally if applicable. Information on duration and frequency of occurrence is included in IEC 721-3-0 as clause 6. Attention is drawn to the fact that combinations of the environmental parameters given may increase the effect on a product. This applies
38、 especially to the presence of high relative humidity in addition to biological conditions, or to conditions of chemically or mechanically active substances. i The environmental conditions present at a location may be affected by other influences, for example heat dissipation sources, special proces
39、s conditions. etc. STD.BS1 BS EN b0721-3-q-ENGL 1795 LbZqbb b23777 O38 Page 6 1 EN 60721-3-4 : 1995 I Issue 2, June 1997 Measurements of the environmental conditions present at a location shall be made at a representative point in the vicinity of the product. It is recognized that extreme or special
40、 environmental conditions may exist. Specifications for products to operate under such special conditions are a matter for negotiation between supplier and user. 5 Classlficatlon of groups of envlronrnental parameters and thelr severltles A number of classes for climatic conditions (K), special clim
41、atic conditions (2). biological conditions (B), chemically active substances (C), mechanically active substances (S) and mechanical conditions (M) are specified in tables 1 to 6. This classification allows a number of possible combinations of environmental conditions which bear upon products whereve
42、r used. It represents the real situation in respect of worldwide conditions of use, due to local influences of open-air climate, mounting, process conditions, etc. (See also clause 6.) A -class indicated with higher digit conditions normally includes classes with lower digits. For certain parameters
43、, it has not yet been possible to specify quantitative severities. For a given location or product, reference should be made to the total set of classes, for example 4W4Z 1 /424/426/481/4C2/4S2/4M4. Annex A explains the basis of the classes. It contains a summary of the conditions covered by a class
44、 and gives a survey of cnditionsaffecting the choice of environmental parameters and their severities. Annex B contains a ciimatogram showing the interdependence of air temperature, relative humidity and absolute humidity. Annex C gives examples for practical application of this classification. 5.1
45、Climatic conditions The climatic conditions specified for classes 4K1 to 4K4 refer to the groups of open-air climates in 5.4 of IEC 721-2-1. Reference values are the mean values of the annual extreme values of temperature and humidity. I Climatic conditions in tropical areas as specified in classes
46、4K5 and 4K6 are explained in annex E . At locations which are non-weatherprotected, the influence of special climatic conditions. constitutes a more functional parts than at weatherprotected locations. Particularly the effects of temperature change, solar radiation, precipitation. air velocity and w
47、ind-chill should be considered in this respect. significant share of the effects bearing upon a product and its i ;j O BSI 1997 STD-BSI BS EN b0721-3-4-ENGL 1975 9 lb24bb b23778 T74 m Page 7 EN 60721-3-4 : 1995 The severity of these effects may be influenced for instance by constructional details (s
48、ort and thickness of material, colour of surface, sealing or breathing of casings, product heating, etc.) and by mounting details (selection of mounting site, consideration of degree of exposure to prevailing wind and weather, etc.). 5.2 Special climatic conditions In practice, the parameters heat r
49、adiation, movement of surrounding air, water from sources other than rain and low air pressure may occur with any of their severities in combination with any of the other climatic conditions. These parameters are therefore specified as special conditions in table 2. In this case, an assumption of the coincidence of events of increasing severity would lead to unnecessary overdesign. 5.3 Biological conditions No quantitative severities have been specified for these conditions. The specified para- meters are typical, but may not be complete. 5.4 Chemica
