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1、BRITISH STANDARD BS EN 60721-3-4:1995 IEC 721-3-4: 1995 Incorporating Amendment No. 1 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 607
2、21-3-4:1995 has the status of a British Standard ICS 19.040 BS EN 60721-3-4:1995 This British Standard, having been prepared under the direction of the Electrotechnical Sector Board, was published under the authority of the Standards Board and comes into effect on 15 June 1995 BSI 04-2000 The follow
3、ing BSI references relate to the work on this standard: Committee reference GEL/50 Draft for comment 93/209314 DC ISBN 0 580 24184 X Committees responsible for this British Standard The preparation of this British Standard was entrusted by Technical Committee GEL/50, to panel GEL/50/-/1, Coordinatio
4、n of IEC/TC 75 work, 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.DateComments 9513June 1997Indicated by a sideline in the margin BS EN 60721-3-4:1995 BSI 04-200
5、0i Contents Page Committees responsibleInside front cover National forewordii Foreword2 Text of EN 60721-3-43 List of referencesInside back cover BS EN 60721-3-4:1995 ii BSI 04-2000 National foreword This Section of BS EN 60721 has been prepared by Technical Committee GEL/50 and is the English langu
6、age version of 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 including amendment A1:1997, published by the European Committee for Electrotechni
7、cal Standardization (CENELEC). It is identical with IEC 721-3-4:1995, including Amendment 1:1996, published by the International Electrotechnical Commission (IEC). This British Standard supersedes BS EN 60721-3-4:1993 which is withdrawn. A British Standard does not purport to include all the necessa
8、ry provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Cross-references Publication referred toCorresponding British Standard EN 60721-3-0:1993 (IEC 721-3-0:1
9、984) BS EN 60721 Classification of environmental conditions Part 3. Classification of groups of environmental parameters and their severities Section 3.0:1993 Introduction BS 7527 Classification of environmental conditions HD 478.1 S2 (IEC 721-1:1990) Part 1:1991 Environmental parameters and their s
10、everities HD 478.2 S1 (IEC 721-2-1:1982) Part 2. Environmental conditions appearing in nature Section 1:1991 Temperature and humidity Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, the EN title page, pages 2 to 24, an inside back cover and a back cover
11、. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 60721-3-4 February 1995 + A1 January 1997 ICS 19.040 Descriptors: Environmenta
12、l conditions, stationary use at non-weather protected locations English version Classification of environmental conditions Part 3: Classification of groups of environmental parameters and their severities Section 4: Stationary use at non-weatherprotected locations (includes amendment A1:1997) (IEC 7
13、21-3-4:1995 + A1:1996) Classification des conditions denvironnement Partie 3: Classification des groupements des agents denvironnement et de leurs svrits Section 4: Utilisation poste fixe, non protg contre les intempries (inclut lamendement A1:1997) (CEI 721-3-4:1995 + A1:1996) Klassifizierung von U
14、mweltbedingungen Teil 3: Klassen von Umwelteinflugren und deren Grenzwerte Hauptabschnitt 4: Ortsfester Einsatz nicht wettergeschtzt (enthlt nderung A1:1997) (IEC 721-3-4:1995 + A1:1996) This European Standard was approved by CENELEC on 1994-10-04. CENELEC members are bound to comply with the CEN/CE
15、NELEC 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 application to the Central Secretariat or to any
16、 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 has the same status as the official vers
17、ions. CENELEC 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 Standa
18、rdization Comit 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 60721-3-4:1995 + A1:1997 E EN 60721-3-4:1995 BSI 04-2000 2 Foreword The text of t
19、he document 75(CO)103A, future amendment to IEC 721-3-4:1987, prepared by IEC 75, Classification of environmental conditions, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as amendment A3 to EN 60721-3-4:1993 in 1994-10-04. The text of this document, together with that o
20、f IEC 721-3-4:1987 and its amendments 1:1991 and 2:1993, was published by IEC as the second edition of IEC 721-3-4 in January 1995. According to a decision of principle taken by the Technical Board of CENELEC, the approval of EN 60721-3-4:1993/A3 has been converted into the approval of a new EN 6072
21、1-3-4. The following dates were fixed: Annexes designated “normative” are part of the body of the standard. Annexes designated “informative” are given for information only. In this standard, Annex ZA is normative and Annex A, Annex B, Annex C and Annex D are informative. Annex ZA has been added by C
22、ENELEC. 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 submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as amendment A1 to EN 60721-3-4:1995 on 1996-12-09.
23、 The following dates were fixed: Contents Page Foreword2 1Scope3 2Normative references3 3Definitions3 4General3 5Classification of groups of environmental parameters and their severities4 6Sets of environmental condition class combinations5 Annex A (informative) Survey of conditions affecting the ch
24、oice of environmental parameters and their severities11 Annex B (informative) Interdependence of air temperature, relative humidity and absolute humidity17 Annex C (informative) Examples for practical application of the classification specified in this standard19 Annex D (informative) Summary of con
25、ditions covered by sets of class combinations20 Annex E (informative) Explanation of the environmental conditions in tropical areas as specified in classes 4K5 and 4K621 Annex ZA (normative) Other international publications quoted in this standard with the references of the relevant European publica
26、tions23 Figure 1 Model shock response spectra10 Figure B.1 Climatogram. Interdependence of air temperature, relative air humidity and absolute air humidity18 Figure E.1 Climatograms for tropical damp type of climate and tropical dry type of climate22 Table 1 Classification of climatic controls6 Tabl
27、e 2 Classification of special climatic conditions7 Table 3 Classification of biological conditions7 Table 4 Classification of chemically active substances8 Table 5 Classification of mechanically active substances8 Table 6 Classification of mechanical conditions9 Table 7 Sets of environmental class c
28、ombinations9 latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement(dop) 1996-01-01 latest date by which the national standards conflicting with the EN have to be withdrawn(dow) 1996-01-01 latest date by which the EN has
29、 to be implemented at national level by publication of an identical national standard or by endorsement(dop) 1997-09-01 latest date by which the national standards conflicting with the EN have to be withdrawn(dow) 1997-09-01 EN 60721-3-4:1995 BSI 04-20003 1 Scope This section of IEC 721-3 classifies
30、 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, maintenance and repair. Locations which are non-weatherprotected, where products may be
31、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 conditions as s
32、uch 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 related to ionizing radiation are excluded. Any other unforeseen incidents are also excluded. The possibility
33、of their occurrence should be taken into account in special cases. 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 other se
34、ctions of IEC 721-3. 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 in Annex A. 2 Nor
35、mative references The following 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 parties to agreements
36、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 ISO maintain registers of currently valid International Standards. IEC 721-1:1990, Classification of environmental cond
37、itions Part 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 1: Temperature and humidity. Amendment 1 (1987) IEC 721-3-0:1984, Classification of environmental
38、 conditions Part 3: Classification of groups of environmental parameters and their severities Section 0: Introduction. Amendment 1 (1987) 3 Definitions In addition to the definitions in clause 3 of IEC 721-1, the following definitions apply to this standard: 3.1 stationary use the product is mounted
39、 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 included 3.2 location which is non-weatherprotected a location
40、 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 conditions might differ from those during operation. Therefore, the s
41、election 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 values. These values may be reached, but do not occur permanently.
42、 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 environmental parameter. They should be specified additionally if appl
43、icable. Information on duration and frequency of occurrence is included in IEC 721-3-0 as clause 6. EN 60721-3-4:1995 4 BSI 04-2000 Attention is drawn to the fact that combinations of the environmental parameters given may increase the effect on a product. This applies especially to the presence of
44、high relative humidity in addition to biological conditions, or to conditions of chemically or mechanically active substances. The environmental conditions present at a location may be affected by other influences, for example heat dissipation sources, special process conditions, etc. Measurements o
45、f 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 environmental conditions may exist. Specifications for products to operate under such special conditions are a matter for negotiation
46、between supplier and user. 5 Classification of groups of environmental parameters and their severities A number of classes for climatic conditions (K), special climatic conditions (Z), biological conditions (B), chemically active substances (C), mechanically active substances (S) and mechanical cond
47、itions (M) are specified in Table 1 to Table 6. This classification allows a number of possible combinations of environmental conditions which bear upon products wherever used. It represents the real situation in respect of worldwide conditions of use, due to local influences of open-air climate, mo
48、unting, process conditions, etc. (See also clause 6.) A class indicated with higher digit conditions normally includes classes with lower digits. For certain parameters, it has not yet been possible to specify quantitative severities. For a given location or product, reference should be made to the
49、total set of classes, for example 4K2/4Z1/4Z4/4Z6/4B1/4C2/4S2/4M4. Annex A explains the basis of the classes. It contains a summary of the conditions covered by a class and gives a survey of conditions affecting the choice of environmental parameters and their severities. Annex B contains a climatogram showing the interdependence of air temperature, relative humidity and absolute humidity. Annex C gives examples for practical application of this classification. 5.1 Climatic conditions The climatic conditions spe