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 EN6072
2、1-3-4:1995 has the status of a British Standard ICS 19.040BSEN60721-3-4:1995 This British Standard, having been prepared under the directionof the Electrotechnical Sector Board, was published underthe authority of the Standards Board and comesintoeffect on 15June1995 BSI 04-2000 The following BSI re
3、ferences 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, Coordination of IEC/T
4、C75 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. Date Comments 9513 June 1997 Indicated by a sideline in the marginBSEN60721-3-4:1995 BSI 04-2000 i Conten
5、ts Page Committees responsible Inside front cover National foreword ii Foreword 2 Text of EN 60721-3-4 3 List of references Inside back coverBSEN60721-3-4:1995 ii BSI 04-2000 National foreword This Section of BSEN60721 has been prepared by Technical Committee GEL/50 and is the English language versi
6、on of EN60721-3-4:1995 Classification of environmental conditions Part 3: Classification of groups of environmental parameters and their severities Section4: Stationary use at non-weatherprotected locations including amendment A1:1997, published by the European Committee for Electrotechnical Standar
7、dization (CENELEC). It is identical with IEC721-3-4:1995, including Amendment1:1996, published by the International Electrotechnical Commission (IEC). This British Standard supersedes BSEN60721-3-4:1993 which is withdrawn. A British Standard does not purport to include all the necessary provisions o
8、f 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 to Corresponding British Standard EN 60721-3-0:1993 (IEC 721-3-0:1984) BS EN 607
9、21 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 severities HD 4
10、78.2 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, theEN title page, pages 2 to 24, an inside back cover and a back cover. This standard
11、 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: Environmental conditions, st
12、ationary 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 721-3-4:1995 + A1
13、: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 Umweltbedingungen
14、 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 on1994-10-04. CENELEC members are bound to comply with the CEN/CENELEC Internal Re
15、gulations 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 member.
16、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 mem
17、bers 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 Comit E
18、uropen 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 EEN60721-3-4:1995 BSI 04-2000 2 Foreword The text of the document 75(CO)1
19、03A, future amendment to IEC721-3-4:1987, prepared by IEC75, Classification of environmental conditions, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as amendment A3 to EN60721-3-4:1993 in1994-10-04. The text of this document, together with that of IEC721-3-4:1987 and i
20、ts amendments1:1991 and2:1993, was published by IEC as the second edition of IEC721-3-4 in January1995. According to a decision of principle taken by the Technical Board of CENELEC, the approval of EN60721-3-4:1993/A3 has been converted into the approval of a new EN60721-3-4. The following dates wer
21、e 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 andAnnex D are informative. Annex ZA has been added by CENELEC. Foreword to amendment A
22、2 The text of document 75/280/FDIS, future amendment1 to IEC721-3-4:1995, prepared by IECTC75, Classification of environmental conditions, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC asamendment A1 to EN60721-3-4:1995 on1996-12-09. The following dates were fixed: Conte
23、nts Page Foreword 2 1 Scope 3 2 Normative references 3 3 Definitions 3 4 General 3 5 Classification of groups of environmental parameters and their severities 4 6 Sets of environmental condition class combinations 5 Annex A (informative) Survey of conditions affecting the choice of environmental par
24、ameters and their severities 11 Annex B (informative) Interdependence of airtemperature, relative humidity and absolutehumidity 17 Annex C (informative) Examples for practical application of the classification specified in thisstandard 19 Annex D (informative) Summary of conditions covered by sets o
25、f class combinations 20 Annex E (informative) Explanation of the environmental conditions in tropical areas asspecified in classes4K5 and4K6 21 Annex ZA (normative) Other international publications quoted in this standard with thereferences of the relevant European publications 23 Figure 1 Model sho
26、ck response spectra 10 Figure B.1 Climatogram. Interdependence ofairtemperature, relative air humidity and absolute air humidity 18 Figure E.1 Climatograms for tropical damp type of climate and tropical dry type of climate 22 Table 1 Classification of climatic controls 6 Table 2 Classification of sp
27、ecial climaticconditions 7 Table 3 Classification of biological conditions 7 Table 4 Classification of chemically activesubstances 8 Table 5 Classification of mechanically activesubstances 8 Table 6 Classification of mechanical conditions 9 Table 7 Sets of environmental class combinations 9 latest d
28、ate by which the ENhas to be implemented at national level by publication of an identical national standard or byendorsement (dop) 1996-01-01 latest date by which the national standards conflicting with the EN haveto be withdrawn (dow) 1996-01-01 latest date by which the ENhas to be implemented at n
29、ational level by publication of an identical national standard or byendorsement (dop) 1997-09-01 latest date by which the national standards conflicting with the EN haveto be withdrawn (dow) 1997-09-01EN60721-3-4:1995 BSI 04-2000 3 1 Scope This section of IEC721-3 classifies groups of environmental
30、parameters and their severities towhich products are subjected when mounted forstationary 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 mounted for stationary use
31、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 such are considered. No spec
32、ial 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 of their occurrence should
33、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 sections of IEC721-3. A limit
34、ed 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 inAnnex A. 2 Normative references The followi
35、ng normative documents contain provisions which, through reference in this text, constitute provisions of this section of IEC721-3. At the time of publication, the editions indicated were valid. All normative documents are subject to revision, and parties to agreements based on this section of IEC72
36、1-3 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 conditions Part 1: Environmental pa
37、rameters and their severities. Amendment1 (1992) IEC 721-2-1:1982, Classification of environmental conditions Part 2: Environmental conditions appearing in nature Section 1: Temperature and humidity. Amendment1 (1987) IEC 721-3-0:1984, Classification of environmental conditions Part 3: Classificatio
38、n of groups of environmental parameters and their severities Section0: Introduction. Amendment1 (1987) 3 Definitions In addition to the definitions in clause3 of IEC 721-1, the following definitions apply to this standard: 3.1 stationary use the product is mounted firmly on the structure or on mount
39、ing 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 at which the product is not protect
40、ed from direct weather influences 4 General For further general guidance, see IEC721-3-0. 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 selection of another class may be nece
41、ssary 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. Depending on the local situation, th
42、ere 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 applicable. Information on duration and f
43、requency of occurrence is included in IEC721-3-0 as clause6.EN60721-3-4:1995 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 high relative humidity in addition to bio
44、logical 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 of the environmental conditions present at
45、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 between supplier and user. 5 Classificatio
46、n 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 conditions (M) are specified inTable 1 toTable
47、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, mounting, process conditions, etc. (Seealsoclau
48、se6.) 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 total set of classes, for example 4K2/4Z1/4Z4/4Z
49、6/4B1/4C2/4S2/4M4. 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 specified for classes4K1 to4K4 refer to the groups
