1、Electrical accessories Harmonization of general rules PD IEC/TR 61916:2017 BSI Standards Publication WB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06National foreword This Published Document is the UK implementation of IEC/TR 61916:2017. It supersdes PD IEC/TR 61916:2014 which is withdrawn.
2、The UK participation in its preparation was entrusted to Technical Committee PEL/23, Electrical accessories. A list of organizations represented on this committee can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Use
3、rs are responsible for its correct application. The British Standards Institution 2017. Published by BSI Standards Limited 2017 ISBN 978 0 580 92790 4 ICS 29.120.01 Compliance with a British Standard cannot confer immunity from legal obligations. This Published Document was published under the autho
4、rity of the Standards Policy and Strategy Committee on 30 April 2017. Amendments/corrigenda issued since publication Date Text affected PUBLISHED DOCUMENT PD IEC/TR 61916:2017 IEC TR 61916 Edition 4.0 2017-03 TECHNICAL REPORT Electrical accessories Harmonization of general rules INTERNATIONAL ELECTR
5、OTECHNICAL COMMISSION ICS 29.120.01 ISBN 978-2-8322-4117-2 Registered trademark of the International Electrotechnical Commission Warning! Make sure that you obtained this publication from an authorized distributor. colour inside 2 IEC TR 61916:2017 IEC 2017 CONTENTS FOREWORD . 4 INTRODUCTION . 6 1 S
6、cope 7 2 Normative references 7 3 Terms and definitions 7 4 General requirements 8 4.1 General . 8 4.2 Standard conditions for operation in service 8 4.2.1 Ambient temperature . 8 4.2.2 Altitude 9 4.2.3 Maximum relative humidity at 40 C . 9 4.2.4 External magnetic field 9 4.2.5 Accessory orientation
7、 9 4.3 Ambient air temperature range for testing . 9 5 Resistance to heat . 9 5.1 General . 9 5.2 Requirements . 9 5.3 Tests 10 6 Screws, current-carrying parts and connections (electrical and mechanical) 11 6.1 General . 11 6.2 Types of screw 11 6.2.1 Thread-forming screw 11 6.2.2 Thread-cutting sc
8、rew . 11 6.3 Requirements . 12 6.4 Tests 14 7 Resistance to abnormal heat and to fire . 15 7.1 General . 15 7.2 Requirements . 15 7.3 Glow-wire flammability test for end-products, IEC 60695-2-11 16 7.3.1 Purpose and principle 16 7.3.2 Test method 17 7.3.3 Relevance of test data . 17 8 Resistance of
9、insulating materials to tracking 18 8.1 General . 18 8.2 Requirements . 18 8.3 Tracking index test, IEC 60112 . 18 8.3.1 Purpose and principle 18 8.3.2 Test method 18 8.3.3 Relevance of test data . 19 9 Resistance to rusting . 19 9.1 General . 19 9.2 Requirements . 19 9.3 Test 19 10 Legibility, dura
10、bility and indelibility of marking . 20 10.1 General . 20 10.2 Requirements . 20 PD IEC/TR 61916:2017IEC TR 61916:2017 IEC 2017 3 10.3 Test 20 11 Screw-type terminals for connecting conductors 21 12 Criteria for tests in accessory standards 21 13 Tolerances 21 14 Mechanical strength 22 14.1 Impact.
11、22 14.2 Free fall 22 15 Appropriate dimensioning of insulation distances . 22 15.1 General . 22 15.2 General information 22 15.3 Dimensioning of clearances 23 15.4 Dimensioning of creepage distances . 23 15.5 Dimensioning of solid insulation 25 15.6 Dimensioning of functional insulation 25 15.7 Prac
12、tical application of the IEC 60664 series with regards to particular questions 25 15.8 Other information useful for TC 23 and its subcommittees . 25 16 Resistance to UV . 26 16.1 General . 26 16.2 Basic principles . 27 16.3 Tests 27 16.3.1 General . 27 16.3.2 UV test 27 16.3.3 Mechanical test . 28 (
13、informative) Material selection process . 29 Annex A A.1 General . 29 A.2 Requirements for material selection process . 29 A.3 Material selection process. 30 A.3.1 Material selection based on flammability classifications . 30 A.3.2 Arc ignition test 30 (informative) Suggested GWEPT temperatures 32 A
14、nnex B Bibliography 33 Figure 1 Thread-forming screw 11 Figure 2 Thread-cutting screw 12 Figure 3 Small parts . 17 Figure 4 Test piston dimensions. 21 Table 1 Torque per thread diameter . 14 Table A.1 Minimum glow-wire ignition temperature (GWIT) of insulating materials required for the flammability
15、 classification of the selected material . 30 Table A.2 Minimum glow-wire ignition temperature (GWIT) of insulating materials required for the GWFI classification of the selected material . 30 Table A.3 Minimum number of arcs required for the flammability classification of the selected material 30 T
16、able A.4 Minimum number of arcs required for the GWFI classification of the selected material 30 PD IEC/TR 61916:2017 4 IEC TR 61916:2017 IEC 2017 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ ELECTRICAL ACCESSORIES HARMONIZATION OF GENERAL RULES FOREWORD 1) The International Electrotechnical Commissi
17、on (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and in a
18、ddition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee inte
19、rested in the subject dealt with may participate in this preparatory work. International, governmental and non- governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for Standardization (ISO) in accordance
20、with conditions determined by agreement between the two organizations. 2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international consensus of opinion on the relevant subjects since each technical committee has representation from all intereste
21、d IEC National Committees. 3) IEC Publications have the form of recommendations for international use and are accepted by IEC National Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC Publications is accurate, IEC cannot be held responsible
22、for the way in which they are used or for any misinterpretation by any end user. 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications transparently to the maximum extent possible in their national and regional publications. Any divergence betwe
23、en any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter. 5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity assessment services and, in some areas, access to IEC marks of con
24、formity. IEC is not responsible for any services carried out by independent certification bodies. 6) All users should ensure that they have the latest edition of this publication. 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and mem
25、bers of its technical committees and IEC National Committees for any personal injury, property damage or other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and expenses arising out of the publication, use of, or reliance upon, this IEC Publication
26、or any other IEC Publications. 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is indispensable for the correct application of this publication. 9) Attention is drawn to the possibility that some of the elements of this IEC Publication
27、may be the subject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights. The main task of IEC technical committees is to prepare International Standards. However, a technical committee may propose the publication of a Technical Report when it has collecte
28、d data of a different kind from that which is normally published as an International Standard, for example “state of the art“. IEC TR 61916, which is a Technical Report, has been prepared by IEC technical committee 23: Electrical accessories. This fourth edition cancels and replaces the third editio
29、n published in 2014 and constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) clarification of the introduction and the scope; b) clarification of subclause 6.3; c) modification of Clause 7; d) modification of Cla
30、use 10; e) addition of Annex B for temperature selection for GWEPT. PD IEC/TR 61916:2017IEC TR 61916:2017 IEC 2017 5 The text of this Technical Report is based on the following documents: Enquiry draft Report on voting 23/742/DTR 23/766/RVDTR Full information on the voting for the approval of this T
31、echnical Report can be found in the report on voting indicated in the above table. This document has been drafted in accordance with the ISO/IEC Directives, Part 2. In this Technical Report, the following print types are used: requirements proper: in roman type; test specifications: in italic type;
32、Explanatory matter: in smaller roman type. The committee has decided that the contents of this document will remain unchanged until the stability date indicated on the IEC website under “http:/webstore.iec.ch“ in the data related to the specific document. At this date, the document will be reconfirm
33、ed, withdrawn, replaced by a revised edition, or amended. A bilingual version of this publication may be issued at a later date. IMPORTANT The colour inside logo on the cover page of this publication indicates that it contains colours which are considered to be useful for the correct understanding o
34、f its contents. Users should therefore print this document using a colour printer. PD IEC/TR 61916:2017 6 IEC TR 61916:2017 IEC 2017 INTRODUCTION The purpose of this document is to have harmonized rules on the same subjects in all the standards published by IEC TC 23 and its subcommittees, in order
35、to give coordinated indications to subcommittees when developing their standards. These recommendations are meant as a guide. Consequently, subcommittees, according to their own particularities, can use whole or part of the document, which is not meant to be compulsory. In this document, the word “s
36、hall” is used only to illustrate how the relevant requirement should be implemented in a product standard and does not itself imply a product requirement within this document. In publishing these recommendations, IEC TC 23 wishes to spread the information so that other committees of the IEC can use
37、these recommendations, if necessary. PD IEC/TR 61916:2017IEC TR 61916:2017 IEC 2017 7 ELECTRICAL ACCESSORIES HARMONIZATION OF GENERAL RULES 1 Scope This document, which is a Technical Report, provides guidance on requirements and tests for subjects applicable to electrical accessories that are withi
38、n the scope of IEC TC 23 and its subcommittees. 2 Normative references There are no normative references in this document. 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. ISO and IEC maintain terminological databases for use in standardization at
39、 the following addresses: IEC Electropedia: available at http:/www.electropedia.org/ ISO Online browsing platform: available at http:/www.iso.org/obp 3.1 tracking progressive formation of conductive paths, which are produced on the surface of or within a solid insulating material, due to the combine
40、d effects of electric stress and electrolytic contamination SOURCE: IEC 60050-212:2010, 212-11-56, modified The note has been deleted. 3.2 electric erosion wearing away of insulating material by the action of electric discharges SOURCE: IEC 60050-212:2010, 212-11-55 3.3 comparative tracking index CT
41、I numerical value of the maximum voltage in volts at which a material withstands 50 drops without tracking Note 1 to entry: The value of each test voltage and the CTI should be divisible by 25. SOURCE: IEC 60050-212:2010, 212-11-59, modified In the definition, the number of drops is specified and th
42、e text “and without a persistent flame occurring under specified test conditions“ has been removed at the end of the definition. Note 1 to entry has been added. PD IEC/TR 61916:2017 8 IEC TR 61916:2017 IEC 2017 3.4 proof tracking index PTI numerical value of the proof voltage in volts at which an in
43、sulating material withstands 50 drops without tracking SOURCE: IEC 60050-212:2010, 212-11-60, modified In the definition, the number of drops is specified. As a consequence, the words “can withstand in a specified tracking test without tracking failure and without a persistent flame occurring” have
44、been deleted. 3.5 material selection process of assessing and choosing candidate materials for parts of components or subassemblies during the design stage of a product 4 General requirements 4.1 General Before tests, the specimen is stored for at least 24 h in an atmosphere having a temperature bet
45、ween 15 C and 35 C and relative humidity between 45 % and 75 %, except for the test of Clause 7 where IEC 60112 applies. Accessories within the scope of TC 23 standards, and those of its subcommittees, shall be designed and constructed so that, in normal use, their performance is reliable and safe f
46、or the user and the surroundings. Standard conditions for operation in service for electrical accessories complying with the existing standards should be suitable for use at ambient temperatures not normally exceeding 40 C, and whose average over a period of 24 h does not exceed 35 C, with a lower l
47、imit of the ambient air temperature of 5 C. 4.2 Standard conditions for operation in service 4.2.1 Ambient temperature 4.2.1.1 General Unless covered by a temperature classification, accessories within the scope of TC 23 standards, and those of its subcommittees, should be at least capable of operat
48、ing under the following standard conditions. 4.2.1.2 Ambient air temperature range in normal use Electrical accessories complying with the existing standards are suitable for normal use at ambient temperatures not normally exceeding 40 C, but their average over a period of 24 h does not exceed 35 C,
49、 with a lower limit of the ambient air temperature of 5 C. NOTE This temperature range corresponds to AA4 of IEC 60364-5-51:2005, Table 51A. Part of the temperature range of IEC 60721-3-3, class 3K5, with the high air temperature restricted to 40 C. Accessories intended to be used in ambient air temperatures outside the above mentioned conditions permanently or during a long period shall be covered by special requirements or tests, if necessary, to be dec
