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1、AS/NZS 60950:2000 (Incorporating Amendment No. 1) Australian/New Zealand Standard Safety of information technology equipment (IEC 60950:1999, MOD) AS/NZS 60950 Accessed by UNIVERSITY OF SOUTH AUSTRALIA on 06 Jun 2007 AS/NZS 60950:2000 This Joint Australian/New Zealand Standard was prepared by Joint
2、Technical Committee TE-001, Safety of Electronic Equipment. It was approved on behalf of the Council of Standards Australia on 14 April 2000 and on behalf of the Council of Standards New Zealand on 11 April 2000. It was published on 5 June 2000. The following are represented on Committee TE-001: Aus
3、tralian Communications Authority Australian Electrical and Electronic Manufacturers Association Australian Information Industry Association Consumer Electronics Association of New Zealand Consumer Electronics Suppliers Association Department of Defence, Australia Electrical Compliance Testing Associ
4、ation Electrical regulatory authorities Electricity Supply Association of Australia Federation of Australian Commercial Television Stations Institution of Radio and Electronics Engineers, Australia Ministry of Commerce, New Zealand National Association of Testing Authorities Testing organisation, Ne
5、w Zealand Additional interests participating in the preparation of this Standard: Optus Communications Telstra Corporation Keeping Standards up-to-date Standards are living documents which reflect progress in science, technology and systems. To maintain their currency, all Standards are periodically
6、 reviewed, and new editions are published. Between editions, amendments may be issued. Standards may also be withdrawn. It is important that readers assure themselves they are using a current Standard, which should include any amendments which may have been published since the Standard was purchased
7、. Detailed information about joint Australian/New Zealand Standards can be found by visiting the Standards Australia web site at .au or Standards New Zealand web site at www.standards.co.nz and looking up the relevant Standard in the on-line catalogue. Alternatively, both organizations publish an an
8、nual printed Catalogue with full details of all current Standards. For more frequent listings or notification of revisions, amendments and withdrawals, Standards Australia and Standards New Zealand offer a number of update options. For information about these services, users should contact their res
9、pective national Standards organization. We also welcome suggestions for improvement in our Standards, and especially encourage readers to notify us immediately of any apparent inaccuracies or ambiguities. Please address your comments to the Chief Executive of either Standards Australia Internationa
10、l or Standards New Zealand at the address shown on the back cover. This Standard was issued in draft form for comment as DR 99476. Accessed by UNIVERSITY OF SOUTH AUSTRALIA on 06 Jun 2007 AS/NZS 60950:2000 (Incorporating Amendment No 1) Australian/New Zealand Standard Safety of information technolog
11、y equipment (IEC 60950:1999, MOD) Originated in Australia as AS 3260-1988. Originated in New Zealand as NZS 6600:1987 Final edition AS/NZS 3260:1993. Jointly revised and redesignated as AS/NZS 60950:2000. Reissued incorporating Amendment No. 1 (July 2003). COPYRIGHT Standards Australia/Standards New
12、 Zealand All rights are reserved. No part of this work may be reproduced or copied in any form or by any means, electronic or mechanical, including photocopying, without the written permission of the publisher. Jointly published by Standards Australia International Ltd, GPO Box 5420, Sydney, NSW 200
13、1 and Standards New Zealand, Private Bag 2439, Wellington 6020 ISBN 0 7337 3366 2 Accessed by UNIVERSITY OF SOUTH AUSTRALIA on 06 Jun 2007 ii PREFACE This Standard was prepared by the Joint Standards Australia/Standards New Zealand Committee TE-001, Safety of Electronic Equipment, to supersede AS/NZ
14、S 3260:1993, Approval and test specificationSafety of information technology equipment including electrical business equipment, three years from publication. During this time it is anticipated that regulatory authorities will approve information technology equipment to either Standard. This Standard
15、 incorporates Amendment No. 1 (July 2003). The changes required by the Amendment are indicated in the text by a marginal bar and amendment number against the clause, note, table, figure or part thereof affected. The objective of this Standard is to provide requirements which establish minimum safety
16、 standards for the design, construction and operation of mains-powered or battery-powered information technology equipment. It sets out requirements intended to ensure safety for the operator and layman who may come into contact with the equipment and, where specifically stated, for service personne
17、l and which may be used as the basis for approval for Australia and New Zealand. This Standard forms the first edition of AS/NZS 60950, Safety of information technology equipment. This Standard is an adoption with national modifications and contains the full text of IEC 60950:1999, Safety of informa
18、tion technology equipment and has been varied as indicated to take account of Australian/New Zealand conditions. In this Standard, the following print types are used: requirements proper: in arial type; test specifications: in italic type; explanatory matter: in smaller arial type. terms in SMALL CA
19、PITALS are defined in Clause 1.2. Variations to IEC 60950:1999 are indicated at the appropriate places throughout this standard. Strikethrough (example) identifies IEC text, tables and figures which, for the purposes of this Australian/New Zealand Standard, are deleted. Where text, tables or figures
20、 are added, each is set in its proper place and identified by shading (example). Added figures are not themselves shaded, but are identified by a shaded border. The variations to Clauses 6.2.2, 6.2.2.1 and 6.2.2.2 apply only in Australia and are marked by A in the right hand margin. For New Zealand,
21、 the text of the IEC Standard applies and is marked by NZ in the right hand margin. The terms normative and informative have been used in this Standard to define the application of the annex to which they apply. A normative annex is an integral part of a Standard, whereas an informative annex is onl
22、y for information and guidance. As this Joint Standard is reproduced from an International Standard, the following applies: (a) The AS/NZS number is shown only on the cover and title page. (b) In the source text this International Standard should read this Australian/New Zealand Standard, and refere
23、nces to relevant IEC Standard should read relevant IEC, Australian or New Zealand Standard. (c) A full point should be substituted for a comma when referring to a decimal marker. Accessed by UNIVERSITY OF SOUTH AUSTRALIA on 06 Jun 2007 iii References to International Standards in Annex P and Annex Q
24、 should be replaced by references to equivalent Australian or Australian/New Zealand Standards as indicated. Australian or Australian/New Zealand Standards that are identical to the International Standard they replace are appropriately identified. Where no relevant New Zealand or Australian/New Zeal
25、and Standard is listed, the referenced Australian Standard is deemed to be appropriate for the purpose of this Standard. Amendments introduced by Australia/New Zealand are incorporated in the text of this Standard and indicated by a bar in the margin on the left hand side of the page with the letter
26、 A and the Amendment number and also incorporated in Annex ZZ and, where applicable, Annex YY. Accessed by UNIVERSITY OF SOUTH AUSTRALIA on 06 Jun 2007 iv INTRODUCTION 0 Principles of safety The following principles have been adopted by technical committee 74 in the development of this standard. The
27、se principles do not cover performance or functional characteristics of equipment. Words printed in SMALL CAPITALS are terms that are defined in 1.2 of this standard. 0.1 General principles of safety It is essential that designers understand the underlying principles of safety requirements in order
28、that they can engineer safe equipment. These principles are not an alternative to the detailed requirements of this standard, but are intended to provide designers with an appreciation of the basis of these requirements. Where the equipment involves technologies and materials or methods of construct
29、ion not specifically covered, the design of the equipment should provide a level of safety not less than those described in these principles of safety. Designers shall take into account not only normal operating conditions of the equipment but also likely fault conditions, consequential faults, fore
30、seeable misuse and external influences such as temperature, altitude, pollution, moisture, overvoltages on the mains and overvoltages on the telecommunication lines. The following priorities should be observed in determining what design measures to adopt: where possible, specify design criteria that
31、 will eliminate, reduce or guard against hazards; where the above is not practicable because the functioning of the equipment would be impaired, specify the use of protective means independent of the equipment, such as personal protective equipment (which is not specified in this standard); where ne
32、ither of the above measures is practicable, or in addition to those measures, specify the provision of markings and instructions regarding the residual risks. There are two types of persons whose safety needs to be considered, USERS (or OPERATORS) and SERVICE PERSONNEL. USER is the term applied to a
33、ll persons other than SERVICE PERSONNEL. Requirements for protection should assume that USERS are not trained to identify hazards, but will not intentionally create a hazardous situation. Consequently, the requirements will provide protection for cleaners and casual visitors as well as the assigned
34、USERS. In general, USERS should not have access to hazardous parts, and to this end, such parts should only be in SERVICE ACCESS AREAS or in equipment located in RESTRICTED ACCESS LOCATIONS. When USERS are admitted to RESTRICTED ACCESS LOCATIONS they shall be suitably instructed. SERVICE PERSONNEL a
35、re expected to use their training and skill to avoid possible injury to themselves and others due to obvious hazards which exist in SERVICE ACCESS AREAS of the equipment or on equipment located in RESTRICTED ACCESS LOCATIONS. However, SERVICE PERSONNEL should be protected against unexpected hazards.
36、 This can be done by, for example, locating parts that need to be accessible for servicing away from electrical and mechanical hazards, providing shields to avoid accidental contact with hazardous parts, and providing labels or instructions to warn personnel about any residual risk. Accessed by UNIV
37、ERSITY OF SOUTH AUSTRALIA on 06 Jun 2007 v Information about potential hazards can be marked on the equipment or provided with the equipment, depending on the likelihood and severity of injury, or made available for SERVICE PERSONNEL. In general, USERS shall not be exposed to hazards likely to cause
38、 injury, and information provided for USERS should primarily aim at avoiding misuse and situations likely to create hazards, such as connection to the wrong power source and replacement of fuses by incorrect types. MOVABLE EQUIPMENT is considered to present a slightly increased risk of shock, due to
39、 possible extra strain on the supply cord leading to rupture of the earthing conductor. With HAND-HELD EQUIPMENT, this risk is increased; wear on the cord is more likely, and further hazards could arise if the units were dropped. TRANSPORTABLE EQUIPMENT introduces a further factor because it can be
40、used and carried in any orientation; if a small metallic object enters an opening in the ENCLOSURE it can move around inside the equipment, possibly creating a hazard. 0.2 Hazards Application of a safety standard is intended to reduce the likelihood of injury or damage due to the following: electric
41、 shock; energy related hazards; fire; heat related hazards; mechanical hazards; radiation; chemical hazards. 0.2.1 Electric shock Electric shock is due to current passing through the human body. The resulting physiological effects depend on the value and duration of the current and the path it takes
42、 through the body. The value of the current depends on the applied voltage, the impedance of the source and the impedance of the body. The body impedance depends in turn on the area of contact, moisture in the area of contact and the applied voltage and frequency. Currents of approximately half a mi
43、lliampere can cause a reaction in persons in good health and may cause injury indirectly due to involuntary reaction. Higher currents can have more direct effects, such as burn or ventricular fibrillation. Steady state voltages up to 42,4 V peak, or 60 V d.c., are not generally regarded as hazardous
44、 under dry conditions for an area of contact equivalent to a human hand. Bare parts which have to be touched or handled should be at earth potential or properly insulated. Some equipment will be connected to telephone and other external networks. Some TELECOMMUNICATION NETWORKS operate with signals
45、such as voice and ringing superimposed on a steady DC VOLTAGE; the total may exceed the values given above for steady-state voltages. It is common practice for the SERVICE PERSONNEL of telephone companies to handle parts of such circuits bare-handed. This has not caused serious injury, because of th
46、e use of cadenced ringing and because there are limited areas of contact with bare conductors normally handled by SERVICE PERSONNEL. However, the area of contact of a part accessible to the USER, and the likelihood of the part being touched, should be further limited (e.g. by the shape and location
47、of the part). It is normal to provide two levels of protection for USERS to prevent electric shock. Therefore, the operation of equipment under normal conditions and after a single fault, including any consequential faults, should not create a shock hazard. However, provision of additional protectiv
48、e measures, such as protective earthing or SUPPLEMENTARY INSULATION, is not considered a substitute for, or a relief from, properly designed BASIC INSULATION. Accessed by UNIVERSITY OF SOUTH AUSTRALIA on 06 Jun 2007 vi Hazards may result from: Examples of measures to reduce hazards: Contact with bar
49、e parts normally at HAZARDOUS VOLTAGES. Prevent USER access to parts at HAZARDOUS VOLTAGES by fixed or locked covers, SAFETY INTERLOCKS, etc. Discharge accessible capacitors that are at HAZARDOUS VOLTAGES. Breakdown of insulation between parts normally at HAZARDOUS VOLTAGES and accessible conductive parts. Provide BASIC INSULATION and connect the accessible conductive parts and circuits to earth so that exposure to the voltage which can develop is limited because overcurrent protection will disconnect the parts having low imp