1、BRITISH STANDARD BS EN 60721-3-3:1995 IEC 721-3-3: 1994 Incorporating Amendment No.1 Classification of environmental conditions Part3: Classification of groups of environmental parameters and their severities Section3.3 Stationary use at weatherprotected locations The European Standard EN60721-3-3:1
2、995 has the status of a BritishStandard ICS 19.040BSEN60721-3-3:1995 This BritishStandard, having been prepared under the directionof the Electrotechnical Sector Board, was published underthe authority of the Standards Board and comesintoeffect on 15July1995 BSI 03-2000 The following BSI references
3、relate to the work on this standard: Committee reference GEL/50 Draft for comment93/209314 DC ISBN 0 580 24183 1 Committees responsible for this BritishStandard The preparation of this BritishStandard was entrusted to Technical Committee GEL/50, Environmental testing of electrotechnical products, to
4、 panel GEL/50/-/1, Coordination of IEC/TC75 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 9514 June 1997 Indicated by a sideline in the margi
5、nBSEN60721-3-3:1995 BSI 03-2000 i Contents Page Committees responsible Inside front cover National foreword ii Foreword 2 Text of EN60721-3-3 5 List of references Inside back coverBSEN60721-3-3:1995 ii BSI 03-2000 National foreword This Section of BS EN60721 has been prepared by Technical Committee
6、GEL/50 and is the English language version of EN60721-3-3:1995 Classification of environmental conditions Part3: Classification of groups of environmental parameters and their severities Section3: Stationary use at weatherprotected locations including amendment A1:1997, published by the European Com
7、mittee for Electrotechnical Standardization (CENELEC). It is identical with IEC721-3-3:1994 including Amendment1:1996, published by the International Electrotechnical Commission (IEC). This BritishStandard supersedes BS EN60721-3-3:1993 (formerlyBS7527-3.3:1991), which is withdrawn. A British Standa
8、rd does not purport to include all the necessary 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 to Corresponding Br
9、itishStandard EN60721-3-0:1993 (IEC721-3-0:1982) BS EN60721 Classification of environmental conditions Part3. Classification of groups of environmental parameters and their severities Section3.0:1993 Introduction HD478.1 S2 (IEC721-1:1990) Part1:1991 Environmental parameters and their severities HD4
10、78.2.1 S1 (IEC721-2-1:1982) Part2. Environmental conditions appearing in nature Section1:1991 Temperature and humidity Summary of pages This document comprises a front cover, an inside front cover, pagesi andii, theEN title page, pages2 to42, an inside back cover and a back cover. This standard has
11、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 EN60721-3-3 January1995 +A2 January1997 UDC 19.040 Supersedes EN60721-3-3:1993 and its amendment Descr
12、iptors: Environmental conditions, groups of environmental parameters, stationary protected locations English version Classification of environmental conditions Part3:Classification of groups of environmental parameters and their severities Section3: Stationary useatweatherprotected locations (includ
13、es amendment A2:1997) (IEC721-3-3:1994+A2:1996) Classification des conditions denvironnement Partie3: Classification des groupements des agents denvironnement et de leurs svritis Section3: Utilisation post fixe, protg contre les intempries (inclut lamendement A2:1997) (CEI721-3-3:1994+A2:1996) Klass
14、ifizierung von Umweltbedingungen Teil3: Klassen von Umwelteinflugren und deren Grenzwerte Hauptabschnitt3: Ortsfester Einsatz wettergeschtzt (enthlt nderung A2:1997) (IEC721-3-3:1994+A2:1996) This European Standard was approved by CENELEC on1994-10-04. CENELEC members are bound to comply with the CE
15、N/CENELEC 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
16、 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 has the same status as the official
17、versions. 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 UnitedKingdom. CENELEC European Committee for Electrotechnical Sta
18、ndardization 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. EN60721-3-3:1995+A2:1997 EEN60721-3-3:1995 BSI 03-2000 2 Foreword The text of doc
19、ument75(CO)102A, future amendment to IEC721-3-3:1987, prepared by IECTC75, Classification of environmental conditions, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as amendment A3 to EN60721-3-3:1993 on1994-10-04. The text of this document, together with that of IEC721-
20、3-3:1987 and its amendments1:1991 and2:1993, was published by IEC as the second edition of IEC721-3-3 in December1994. According to a decision of principle taken by the Technical Board of CENELEC, the approval of EN60721-3-3:1993/A3 has been converted into the approval of a new EN60721-3-3. The foll
21、owing 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 CENELEC. Forewor
22、d to amendment A2 The text of document75/279/FDIS, future amendment2 to IEC721-3-3:1994, prepared by IECTC75, Classification of environmental conditions, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as amendment A2 to EN60721-3-3:1995 on1996-12-09. NOTEThere is no amend
23、ment A1 to EN60721-3-3:1995. The following dates were fixed: latest date by which the ENhas to be implemented at national level by publication of an identical national standard or by endorsement (dop)1995-12-01 latest date by which the national standards conflicting with the EN haveto be withdrawn (
24、dow)1995-12-01 latest date by which the amendment has 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 amendment have to be withdrawn (dow) 1997-09-01EN60721-3-3:199
25、5 BSI 03-2000 3 Contents Page Foreword 2 1 Scope 5 2 Normative references 5 3 Definitions 5 4 General 5 5 Classification of groups of environmental parameters and their severities 6 6 Sets of environmental condition class combinations 7 Annex A (informative) Survey of conditions affecting the choice
26、 of environmental parameters and their severities 13 Annex B (informative) Climatograms 26 Annex C (informative) Examples for practical application of the classification specified in this standard 37 Annex D (informative) Summary of conditions covered by sets of class combinations 38 Annex E (inform
27、ative) Explanation of the environmental conditions in tropical areas as specified in classes3K9 and3K10 39 Annex ZA (normative) Other international publications quoted in this standard with the references of the relevant European publications 42 Figure 1 Model shock response spectra (first order max
28、imax shock response spectra). Forexplanation see note6 relating to Table1 of IEC721-1(1990) 12 Figure B.1 Climatogram for class3K1 (tolerance bands for temperature are marked by broken lines) 26 Figure B.2 Climatogram for class 3K2 27 Figure B.3 Climatogram for class 3K3 28 Figure B.4 Climatogram fo
29、r class 3K4 29 Figure B.5 Climatogram for class 3K5 30 Figure B.6 Climatogram for class 3K6 31 Figure B.7 Climatogram for class 3K7 32 Figure B.8 Climatogram for class 3K7L 33 Figure B.9 Climatogram for class 3K8 34 Figure B.10 Climatogram for class 3K8H 35 Figure B.11 Climatogram for class 3K8L 36
30、Figure E.1 Climatograms for tropical damp type of climate and tropical dry type of climate 41 Page Table 1 Classification of climatic conditions 8 Table 2 Classification of special climatic conditions 9 Table 3 Classification of biological conditions 9 Table 4 Classification of chemically active sub
31、stances 10 Table 5 Classification of mechanically active substances 10 Table 6 Classification of mechanical conditions 11 Table 7 Sets of environmental class combinations 114 blankEN60721-3-3:1995 BSI 03-2000 5 1 Scope This section of IEC721-3 classifies groups of environmental parameters and their
32、severities to which products are subjected when mounted for stationary use at weatherprotected locations under use conditions, including periods of erection work, down time, maintenance and repair. Weatherprotected locations, where products may be mounted for stationary use permanently or temporaril
33、y, include land-based and offshore enclosed and sheltered 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 specia
34、l 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 be
35、 taken into account in special cases. Microclimate within a product is not included. Conditions of stationary use at non-weatherprotected locations, portable and non-stationary use, use in vehicles and ships, conditions of storage and transportation, and microclimates inside products are given in ot
36、her sections of IEC721-3. 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. 2 Normative references The following normati
37、ve documents contain provisions which, through reference in this text, constitute provisions of this section of IEC721-3. Atthe time of publication, the editions indicated were valid. All normative documents are subject to revision, and parties to agreements based on this section of IEC721-3 are enc
38、ouraged 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. IEC721-1:1990, Classification of environmental conditions Part1: Environmental parameters and
39、their severities. IEC721-2-1:1982, Classification of environmental conditions Part2: Environmental conditions appearing in nature Section1: Temperature and humidity Amendment1(1987). IEC721-3-0:1984, Classification of environmental conditions Part3: Classification of groups of environmental paramete
40、rs and their severities Section0: Introduction Amendment1(1987). 3 Definitions In addition to the definitions in clause3 of IEC721-1, the following definitions apply to this standard: 3.1 stationary use the product is mounted firmly on the structure or on mounting devices or it is permanently placed
41、 at a certain site. It is not intended for portable or non-stationary use, but short periods of handling during erection work, down time, maintenance and repair at the location are included 3.2 weatherprotected location a location at which the product is protected from weather influences: totally we
42、atherprotected location (enclosedlocation): direct weather influences aretotally excluded; partially weatherprotected location (shelteredlocation): direct weather influences are not totally excluded. 4 General For further general guidance, see IEC721-3-0. During periods of erection work, which are o
43、ften connected with down time, the user should be aware that conditions might differ from those experienced during the period of 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
44、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 there may be different frequencies of occurrence related to a certain period of time. Such frequencies of occur
45、rence should be considered for any environmental parameter. They should additionally be specified if applicable. Information on duration and frequencies of occurrence is given in Amendment No.1 to IEC721-3-0 as clause6.EN60721-3-3:1995 6 BSI 03-2000 Attention is drawn to the fact that combinations o
46、f the environmental parameters given may increase the effect on a product. This applies especially to the presence of 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 b
47、e affected by other influences, e.g.heat dissipation sources, special process conditions, etc. Measurements of the environmental conditions present at a location should be made at a representative point in the vicinity of the product. It is recognized that extreme or special environmental conditions
48、 may exist. Specifications for products to operate under such special conditions are a matter for negotiation 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), biolo
49、gical conditions(B), chemically active substances (C) and mechanically active substances (S) and mechanical conditions (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 world-wide conditions of use, due to local influences of open-air climate, construction of buildings, mounting, process conditions, etc. (See also clause6.) A cla
