1、BSI Standards PublicationClassification of environmental conditionsPart 2-1: Environmental conditions appearing in nature Temperature and HumidityBS EN 60721-2-1:2014BS 7527-2-1:2014National forewordThis British Standard is the UK implementation of EN 60721-2-1:2014. It is identical to IEC 60721-2-1
2、:2013. It supersedes BS 7527-2.1:1991, which will be withdrawn on 19 November 2016.The UK participation in its preparation was entrusted to TechnicalCommittee GEL/104, Environmental conditions, classification and testing.A list of organizations represented on this committee can be obtained onrequest
3、 to its secretary.This publication does not purport to include all the necessary provisions ofa contract. Users are responsible for its correct application. The British Standards Institution 2014.Published by BSI Standards Limited 2014ISBN 978 0 580 72025 3ICS 19.040Compliance with a British Standar
4、d cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 August 2014.Amendments/corrigenda issued since publicationDate Text affectedBRITISH STANDARDBS EN 60721-2-1:2014EUROPEAN STANDARDNORME EUROPENNEE
5、UROPISCHE NORMEN 60721-2-1 June 2014 ICS 19.040 Supersedes HD 478.2.1 S1:1989 English Version Classification of environmental conditions - Part 2-1: Environmental conditions appearing in nature - Temperature and Humidity (IEC 60721-2-1:2013) Classification des conditions denvironnement - Partie 2-1:
6、 Conditions denvironnement prsentes dans lanature - Temprature et humidit (CEI 60721-2-1:2013) Klassifizierung von Umgebungsbedingungen - Teil 2-1: Natrliche Umgebungsbedingungen - Temperaturund Feuchte (IEC 60721-2-1:2013) This European Standard was approved by CENELEC on 2013-07-30. CENELEC member
7、s are bound to comply with the CEN/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
8、to the CEN-CENELEC Management Centre 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 CEN-CENELEC Ma
9、nagement Centre has the same status as the official versions.CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, I
10、reland, Italy, Latvia,Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. European Committee for Electrotechnical Standardization Comit Europen de Normalisation ElectrotechniqueEuropisches Ko
11、mitee fr Elektrotechnische Normung CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2014 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members. Ref. No. EN 60721-2-1:2014 E BS EN 60721-2-1:2014Foreword The text of document 104/610/FDIS
12、, future edition 2 of IEC 60721-2-1, prepared by IEC/TC 104 “Environmental conditions, classification and methods of test“ was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as EN 60721-2-1:2014. The following dates are fixed: latest date by which the document has to be implement
13、ed at national level by publication of an identical national standard or by endorsement (dop) 2014-12-20 latest date by which the national standards conflicting with the document have to be withdrawn (dow) 2016-07-30 This document supersedes HD 478.2.1 S1:1989. EN 60721-2-1:2014 includes the followi
14、ng significant technical changes with respect to HD 478.2.1 S1:1989: The main changes with respect to HD 478.2.1 S1:1989 are in the definitions of climate types. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CENELEC and/or CEN s
15、hall not be held responsible for identifying any or all such patent rights. Endorsement notice The text of the International Standard IEC 60721-2-1:2013 was approved by CENELEC as a European Standard without any modification. BS EN 60721-2-1:2014 EN 60721-2-1:2014Annex ZA (normative) Normative refer
16、ences to international publications with their corresponding European publications The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the la
17、test edition of the referenced document (including any amendments) applies. NOTE 1 When an International Publication has been modified by common modifications, indicated by (mod), the relevant EN/HD applies. NOTE 2 Up-to-date information on the latest versions of the European Standards listed in thi
18、s annex is available here: www.cenelec.eu Publication Year Title EN/HD Year IEC 60721-1 1990 Classification of environmental conditions - Part 1: Environmental parameters and their severities EN 60721-11) 1995 IEC/TR 62130 - Climatic field data including validation - - MIL210 Extreme and Percentile
19、Environmental Reference Tables (ExPERT) database (Version 1.0 July 1997) PEARCE, E.A., and SMITH, C.G. The Hutchinson World Weather Guide by Helicon Publishing Ltd (ISBN 1-85986-342-6, 2000) KOTTEK, M., GRIESER, J., BECK, C., RUDOLF, B. and RUBEL, F. World Map of the Kppen-Geiger climate classificat
20、ion updated: 2006, Meteorol. Z., 15, 259-263 1) EN 60721-1 includes A1:1992 to IEC 60721-1. BS EN 60721-2-1:2014 EN 60721-2-1:2014 2 60721-2-1 IEC:2013 CONTENTS INTRODUCTION . 5 1 Scope . 6 2 Normative references . 6 3 Terms and definitions, abbreviations, quantities and units 6 4 General informatio
21、n regarding data collection and analysis 6 5 General validation process . 7 6 Open air climates . 8 6.1 General . 8 6.2 Environmental parameters . 8 6.3 Identification of statistical open-air climates 8 6.4 Map of open-air climates . 9 Annex A (informative) Map of climate classification 10 Bibliogra
22、phy 11 Figure A.1 Climate classifications 10 Table 1 Climate classifications . 7 Table 2 Climate classification definitions 7 Table 3 Classification of climates by extreme daily mean values 8 Table 4 Classification of climates by annual extreme values 8 Table 5 Classification of climates by absolute
23、 extreme value . 9 BS EN 60721-2-1:2014 EN 60721-2-1:201460721-2-1 IEC:2013 5 INTRODUCTION Electrotechnical products are used in almost all areas of the world under varying climatic conditions and have to meet the stresses imposed by these climatic conditions with the necessary reliability. A detail
24、ed knowledge of the climatic conditions to which the product will be subjected is necessary in the design stage to ensure that reliability is met. Data on open-air temperature and humidity have been collected and statistically processed for many years throughout the world. Such data is represented i
25、n this part of IEC 60721. In addition to open-air temperature, temperature stresses on a product depend on a number of other environmental parameters, for example solar radiation, air velocity or heating from adjacent equipment. The effects of humidity depend on temperature, temperature changes and
26、impurities in the humid air. In many cases the extremes of temperature and humidity are of great importance even if they occur for a short time. In other cases, where large time constants for heat or water penetration are involved, the mean values of temperature and humidity over a certain period ma
27、y be more important. It has therefore been considered useful to present here both the mean value over many years of the annual extreme values of temperature and humidity, which will occur only for short periods (a few hours), and the mean value over many years of the extreme daily mean values of tem
28、perature and humidity, which will occur for longer periods. In order to cover cases where rare events need to be taken into account, the absolute extreme temperatures and humidity levels, observed over a period of many years, have also been presented. BS EN 60721-2-1:2014 EN 60721-2-1:2014 6 60721-2
29、-1 IEC:2013 CLASSIFICATION OF ENVIRONMENTAL CONDITIONS Part 2-1: Environmental conditions appearing in nature Temperature and humidity 1 Scope This part of IEC 60721 presents classifications of open-air climates in terms of temperature and humidity. It is intended to be used as part of the backgroun
30、d material when selecting appropriate temperature and humidity severities for product testing and application. The climates cover all areas of the world, excluding the central Antarctic and high altitudes (above 5 000 m). This presentation may be used as background material when issuing climatic env
31、ironmental classes for product applications. This standard defines a limited number of open-air climate classifications, in terms of temperature and humidity, which represent the conditions most frequently met by products while being transported, stored, installed and used. 2 Normative references Th
32、e following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60721
33、-1:1990, Classification of environmental conditions Part 1: Environmental parameters and their severities IEC/TR 62130, Climatic field data including validation MIL210 Extreme and Percentile Environmental Reference Tables (ExPERT) database (Version 1.0 July 1997) PEARCE, E.A., and SMITH, C.G., The H
34、utchinson World Weather Guide by Helicon Publishing Ltd (ISBN 1-85986-342-6, 2000) KOTTEK, M., GRIESER, J., BECK, C., RUDOLF, B. and RUBEL, F., World Map of the Kppen-Geiger climate classification updated: 2006, Meteorol. Z., 15, 259-263 3 Terms and definitions, abbreviations, quantities and units T
35、erms and definitions are defined, in context, throughout the present standard. 4 General information regarding data collection and analysis Climatic data was collected and validated in IEC/TR 62130. The two principle data sources were the MIL210 ExPERT and The Hutchinson World Weather Guide. BS EN 6
36、0721-2-1:2014 EN 60721-2-1:201460721-2-1 IEC:2013 7 The MIL210 ExPERT database contained daily temperature and humidity data that were collected during 19731992. Measurement locations were mainly from airports and major cities worldwide. The total number of sites/stations was 289. The uncertainty of
37、 measurements was not documented and the data source contained no data about highest temperature with relative humidity (RH) 95 %. The Hutchinson World Weather Guide used data provided by the British Meteorological Office. The length of the measured period differed from location to location varying
38、from 2 years to 105 years. Detailed locations and uncertainty of measurement were not documented in the book and there were no data relating to highest temperature with RH 95 %. As stated in IEC 60721-1, other references were used for comparison purposes of both the climatic classes and the map of c
39、limatic classes. 5 General validation process The high level process for validating the data used to update this standard is given in Figure 4 of IEC 60721-1:1990. The process has three main phases: identify and collect data; analyse data and compare to current values; update data as appropriate. As
40、 a result of the data collection and analysis, open-air climates have been simplified and revised as shown in Table 1. Table 1 Climate classifications New classifications Previous IEC 60721-2-1 classes when combined Tropical Warm damp and Warm damp, Equable Arid Mild warm dry and Extremely warm dry
41、Temperate Warm temperate and Warm dry Cold Cold temperate Polar Extremely cold and Cold Further details regarding each climate classification are provided in Table 2. Table 2 Climate classification definitions Climate classification Definition Tropical Tropical rain climates where the mean temperatu
42、re of the coldest month exceeds +18 C Arid Arid climates with rainfall less than 500 mm Temperate Temperate rain climates where the mean temperature of the coldest month is between 3 C and +18 C Cold Boreal forest and snow climates. Mean temperature of the warmest month exceeding 10 C and a mean tem
43、perature of the coldest month below 3 C Polar Cold snow climates. Mean temperature of the warmest month below 10 C BS EN 60721-2-1:2014 EN 60721-2-1:2014 8 60721-2-1 IEC:2013 6 Open air climates 6.1 General The different open-air temperature and humidity conditions of the world are presented by defi
44、ning a limited number of climate classifications, hereinafter referred to as “open-air climates“. For the application of a product in a geographical area, the open-air temperature and humidity can be taken from climatic data for that area. This helps ensure that the product is designed for applicati
45、on in this climate. 6.2 Environmental parameters For this standard, open-air climates are defined by the air temperature and relative humidity values. The relative humidity at a certain temperature is defined as the ratio between the actual vapour pressure and the saturation vapour pressure at the s
46、ame temperature. The absolute air humidity is defined as the mass of water vapour per cubic meter of air. The annual extreme value of low temperature normally occurs for a period of approximately 10 h, while the annual extreme value of high temperature normally occurs for approximately 5 h. 6.3 Iden
47、tification of statistical open-air climates The following tables present the climate classifications defined as open-air climates. In Table 3 the mean value of the annual extreme daily mean values of temperature and humidity is given for each climate classification. Table 4 provides the mean value o
48、f annual extreme values of temperature and humidity is given for each classification. In Table 5, the absolute extreme value of temperature and humidity is given for each climate classification. Table 3 Classification of climates by extreme daily mean values Climate classification Mean value of the
49、annual extreme daily mean values of temperature and humidity Low temperature C High temperature C Highest absolute humidity g m3Tropical 10 40 30 Arid 0 45 25 Temperate 15 40 25 Cold 25 35 25 Polar 40 25 15 Table 4 Classification of climates by annual extreme values Climate classification Mean value of the annual extreme values of temperature and humidity Low temperature C High temperature C Highest absolute humidity g m3Tropical 5 45 35 Arid 10 50 30 Temperate 20 40 30 Co
