1、BSI Standards Publication Audio/video, information and communication technology equipment Part 2: Explanatory information related to IEC 62368-1 PD IEC/TR 62368-2:2015National foreword This Published Document is the UK implementation of IEC/TR 62368-2:2015. It supersedes PD IEC/TR 62362-8:2011 which
2、 is withdrawn. The UK participation in its preparation was entrusted to Technical Committee EPL/108, Safety of electronic equipment within the field of audio/video, information technology and communication technology. A list of organizations represented on this committee can be obtained on request t
3、o its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2015. Published by BSI Standards Limited 2015 ISBN 978 0 580 86068 3 ICS 33.160.01; 35.020 Compliance with a
4、British Standard cannot confer immunity from legal obligations. This Published Document was published under the authority of the Standards Policy and Strategy Committee on 31 March 2015. Amendments/corrigenda issued since publication Date Text affected PUBLISHED DOCUMENT PD IEC/TR 62368-2:2015 IEC T
5、R 62368-2 Edition 2.0 2015-02 TECHNICAL REPORT Audio/video, information and communication technology equipment Part 2: Explanatory information related to IEC 62368-1 INTERNATIONAL ELECTROTECHNICAL COMMISSION ICS 35.020; 33.160.01 ISBN 978-2-8322-2268-3 Registered trademark of the International Elect
6、rotechnical Commission Warning! Make sure that you obtained this publication from an authorized distributor. colour inside PD IEC/TR 62368-2:2015 2 IEC TR 62368-2:2015 IEC 2015 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ AUDIO/VIDEO, INFORMATION AND COMMUNICATION TECHNOLOGY EQUIPMENT Part 2: Explana
7、tory information related to IEC 62368-1:2014 FOREWORD 1) The International Electrotechnical Commission (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 al
8、l questions concerning standardization in the electrical and electronic fields. To this end and in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publi
9、cation(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested 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. I
10、EC collaborates closely with the International Organization for Standardization (ISO) in accordance 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 o
11、pinion on the relevant subjects since each technical committee has representation from all interested 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 t
12、o ensure that the technical content of IEC Publications is accurate, IEC cannot be held responsible 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 transparen
13、tly to the maximum extent possible in their national and regional publications. Any divergence between 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 certif
14、ication bodies provide conformity assessment services and, in some areas, access to IEC marks of conformity. 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 shal
15、l attach to IEC or its directors, employees, servants or agents including individual experts and members 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 lega
16、l fees) and expenses arising out of the publication, use of, or reliance upon, this IEC Publication 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 publ
17、ication. 9) Attention is drawn to the possibility that some of the elements of this IEC Publication 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. H
18、owever, a technical committee may propose the publication of a technical report when it has collected data of a different kind from that which is normally published as an International Standard, for example “state of the art“. IEC 62368-2, which is a technical report, has been prepared by subcommitt
19、ee TC 108: Safety of electronic equipment within the field of audio/video, information technology and communication technology. This second edition cancels and replaces the first edition published in 2011. This edition constitutes a technical revision. This second edition updates the first edition o
20、f IEC 62368-2 published in 2011 to take into account changes made to IEC 62368-1:2010 as identified in the Foreword of IEC 62368- 1:2014. PD IEC/TR 62368-2:2015IEC TR 62368-2:2015 IEC 2015 3 This Technical Report is informative only. In case of a conflict between IEC 62368-1 and IEC TR 62368-2, the
21、requirements in IEC 62368-1 prevail over this Technical Report. The text of this technical report is based on the following documents: Enquiry draft Report on voting 108/540/DTR 108/553/RVC Full information on the voting for the approval of this technical report can be found in the report on voting
22、indicated in the above table. In this standard, the following print types are used: notes/explanatory matter: in smaller roman type; tables and figures that are included in the rationale have linked fields (shaded in grey if “field shading” is active). In this standard, “HBSDT“ stands for Hazard Bas
23、ed Standard Development Team, which is the Working Group of TC 108 responsible for the development and maintenance of IEC 62368-1. This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. A list of all parts of the IEC 62368 series can be found, under the general title Au
24、dio/video, information and communication technology equipment, on the IEC website. In this document, only those subclauses considered to need further background reference information or explanation of their content to benefit the reader are included. Therefore, not all numbered subclauses are cited.
25、 Unless otherwise noted, all references are to clauses, subclauses, annexes, figures or tables are located in IEC 62368-1:2014. The committee has decided that the contents of this publication will remain unchanged until the stability date indicated on the IEC web site under “http:/webstore.iec.ch“ i
26、n the data related to the specific publication. At this date, the publication will be reconfirmed, 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 indic
27、ates that it contains colours which are considered to be useful for the correct understanding of its contents. Users should therefore print this document using a colour printer. PD IEC/TR 62368-2:2015 4 IEC TR 62368-2:2015 IEC 2015 AUDIO/VIDEO, INFORMATION AND COMMUNICATION TECHNOLOGY EQUIPMENT Part
28、 2: Explanatory information related to IEC 62368-1:2014 Clause 0 Principles of this product safety standard Clause 0 is informational and provides a rationale for the normative clauses of the standard. 0.5.1 General ISO IEC Guide 51:2014, 6.3.5 states: “When reducing risks the order of priority shal
29、l be as follows: a) inherently safe design; b) guards and protective devices; c) information for end users. Inherently safe design measures are the first and most important step in the risk reduction process. This is because protective measures inherent to the characteristics of the product or syste
30、m are likely to remain effective, whereas experience has shown that even well-designed guards and protective devices can fail or be violated and information for use might not be followed. Guards and protective devices shall be used whenever an inherently safe design measure does not reasonably make
31、it possible either to remove hazards or to sufficiently reduce risks. Complementary protective measures involving additional equipment (for example, emergency stop equipment) might have to be implemented. The end user has a role to play in the risk reduction procedure by complying with the informati
32、on provided by the designer/supplier. However, information for use shall not be a substitute for the correct application of inherently safe design measures, guards or complementary protective measures.” In general, this principle is used in IEC 62368-1. The table below shows a comparison between the
33、 hierarchy required in ISO IEC Guide 51 and the hierarchy used in IEC 62368-1:2014: ISO IEC Guide 51 IEC 62368-1 a) inherently safe design 1. inherently safe design by limiting all energy hazards to class 1 b) guards and protective devices 2. equipment safeguards 3. installation safeguards c) inform
34、ation for end users 4. behavioral safeguards 5. instructional safeguards 0.5.7 Equipment safeguards during skilled person service conditions Purpose: To explain the intent of requirements for providing safeguards against involuntary reaction. Rationale: By definition, a skilled person has the educat
35、ion and experience to identify all class 3 energy sources to which he may be exposed. However, while servicing one class 3 energy source in one location, a skilled person may be exposed to another class 3 energy source in a different location. PD IEC/TR 62368-2:2015IEC TR 62368-2:2015 IEC 2015 5 In
36、such a situation, either of two events is possible. First, something may cause an involuntary reaction of the skilled person with the consequences of contact with the class 3 energy source in the different location. Second, the space in which the skilled person is located may be small and cramped, a
37、nd inadvertent contact with a class 3 energy source in the different location may be likely. In such situations, this standard may require an equipment safeguard solely for the protection of a skilled person while performing servicing activity. _ Clause 1 Scope Purpose: To identify the purpose and a
38、pplicability of this standard and the exclusions from the scope. Rationale: The scope excludes requirements for functional safety. Functional safety is addressed in IEC 61508-1. Because the scope includes computers that may control safety systems, functional safety requirements would necessarily inc
39、lude requirements for computer processes and software. _ Clause 2 Normative references The list of normative references is a list of all documents that have a normative reference to it in the body of the standard. As such, referenced documents are indispensable for the application of this standard.
40、For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. Recently, there were some issues with test houses that wanted to use the latest edition as soon as it was published. As this creates serious
41、 problems for manufacturers, since they have no chance to prepare, it was felt that a reasonable transition period should be taken into account. This is in line with earlier decisions taken by the SMB that allow transition periods to be mentioned in the foreword of the standards. Therefore TC 108 de
42、cided to indicate this in the introduction of the normative references clause, to instruct test houses to take into account any transition period, effective date or date of withdrawal established for the document. These documents are referenced, in whole, in part or as alternative requirements to th
43、e requirements contained in this standard. Their use is specified, where necessary, for the application of the requirements of this standard. _ Clause 3 Terms, definitions and abbreviations Rationale is provided for definitions that deviate from IEC 60050 definitions or from pilot standard definitio
44、ns. 3.3.2.1 electrical enclosure Source: IEC 60050-195:1998, 195-06-13 Purpose: To support the concept of safeguards as used in this standard. Rationale: The definition is modified to use the term “safeguard” in place of the word “protection”. The word “safeguard” identifies a physical “thing” where
45、as the word “protection” identifies the act of protecting. This standard sets forth requirements for use of physical safeguards and requirements for those safeguards. The safeguards provide “protection” against injury from the equipment. PD IEC/TR 62368-2:2015 6 IEC TR 62368-2:2015 IEC 2015 3.3.5.1
46、basic insulation Source: IEC 60050-195:1998,195-06-06 Purpose: To support the concept of safeguards as used in this standard. Rationale: The definition is modified to use the term “safeguard” in place of the word “protection”. The word “safeguard” identifies a physical “thing” whereas the word “prot
47、ection” identifies the act of protecting. This standard sets forth requirements for use of physical safeguards and requirements for those safeguards. The safeguards provide “protection” against injury from the equipment. 3.3.5.2 double insulation Source: IEC 60050-195:1998,195-06-08 Purpose: To supp
48、ort the concept of safeguards as used in this standard. Rationale: See 3.3.5.1, basic insulation. 3.3.5.5 solid insulation Source: IEC 60664-1:2007, 3.4 Purpose: To support the concept that safeguards are interposed between an energy source and a body part. Rationale: IEC 60664-1 defines insulation
49、as material interposed between two conductive parts. The IEC 60664-1 definition is modified by adding that insulation is also “between a conductive part and a body part.” For safety purposes, solid insulation is not only used between conductors, but is also used between a conductor and a body part. For example, a Class II equipment employs solid insulation in this manner. 3.3.5.6 supplementary insulation Source: IEC 60050-195:1998, 195-06-07 Purpose: To support the concept of safeguards as
