【AS澳大利亚标准】AS 3121-2002 Approval and test specification - Insulating mouldings.doc

as/nzs 3121:2002accessed by university of south australia on 06 mar 2007australian/new zealand standardapprovalandtestspecification insulating mouldingsaccessed by university of south australia on 06 mar 2007as/nzs 3121:2002this joint australian/new zealand standard was prepared by joint technical committee el/2- safety of household and similar electrical appliances and small power transformers. it was approved on behalf of the council of standards australia on 8 october 2002 and by the council of standards new zealand on 2 october 2002. it was published on 22 november2002.the following interests are represented on committee el/2association of certification bodiesaustralian chamber of commerce and industryaustralian electrical and electronic manufacturers associationcanterbury manufacturers association new zealandconsumer electronic suppliers association, australiaelectrical regulatory authorities, australiaelectrical test laboratorieselectrical consultantselectricity supply association of australiainstitution of engineers australiametal trades industries association of australiaministry of consumer affairs, new zealandkeeping standards up-to-datestandards are living documents, which reflect progress in science, technology and systems.to maintain their currency, all standards are periodically 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 standards may also be withdrawn.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.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 annual 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 respective 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 comment to the chief executive of either standards australia international or standards new zealand at the address shown on the back cover.this standard was issued in draft form for comment as dr 02927as/nzs 3121:2002accessed by university of south australia on 06 mar 2007australian/new zealand standardapprovalandtestspecification insulating mouldingsin australiafirst published as as c121-1938second edition 1940third edition 1962revised and issued as as 3121-1971second edition 1975third edition 1982fourth edition 1992in new zealandfirst published as nzs/as 3121:1992jointly revised and redesignated as as/nzs 3121:2002copyright standards australia/ standards new zealandall 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 publisherpublished jointly by standards australia international ltdgpo box 5420,sydney, nsw 2001 australia, andstandards new zealandprivate bag 2439,wellington 6020, new zealandaccessed by university of south australia on 06 mar 2007contentspreface .31scope .42application .42.1general requirements of as/nzs 3100 .42.2specific requirements of this specification .43referenced documents .44definitions .55classification .56texture and proportions .57tests .57.1general .57.2resistance to heat test .57.3water absorption test.67.4resistance to white spirit test .6annex a (informative) guide to insulating moulding applications .7 3 as/nzs 3121:2002accessed by university of south australia on 06 mar 2007prefacethis standard was prepared by the joint standards australia/standards new zealand committee el-002- safety of household and similar electrical appliances and small power transformers, to supersede as 3121 - 1992 and nzs/as 3121:1992 on publication.this standard is one of a series of approval and test specifications issued by standards australia and standards new zealand. these standards are to be read in conjunction with as/nzs3100,approvalandtestspecificationgeneralrequirementsforelectrical equipment. the objective of this standard is to outline the conditions which must be met to secure approval for the sale and use of electrical equipment. only safety matters and related conditions are covered.this standard was revised to up-date the list of referenced documents and to effect editorial changes.copyrightaccessed by university of south australia on 06 mar 2007standards australia/standards new zealand australia/new zealand standardapproval and test specification insulating mouldings1scopethis specification applies to insulating mouldings made from natural or synthetic resin or from modified polymers or natural origin, that are used to support, enclose or insulate live parts of electrical equipment.2application2.1general requirements of as/nzs 3100this specification shall be read in conjunction with as/nzs 3100 and the appropriate provisions of as/nzs 3100 shall apply to any insulating moulding.2.2specific requirements of this specificationa moulding shall comply with this specification only if it complies with all the appropriate requirements of this specification and passes the tests specified herein, appropriate to the class of the moulding.3referenced documentsthe following documents are referred to in this specification; standardas2768electrical insulating materials evaluation and classification based on thermal endurance.approval and test specification as/nzs3100general requirements for electrical equipment. 5 as/nzs 3121:2002accessed by university of south australia on 06 mar 20074definitionsfor the purposes of this specification, the definitions below apply.4.1mouldinga product consisting basically of natural or synthetic resin, or of modified polymers of natural origin, which may be formed by casting or by the application of heat and pressure.4.2maximum operating temperaturethe maximum operating temperature to which a moulding may be exposed under conditions of normal use, expressed in degrees celsius.5classificationinsulating mouldings shall be classified in relation to the temperatures to which they can be exposed with safety. the class designation indicates the maximum operating temperature, expressed in degrees celsius, that the moulding will withstand without impairment of its electrical, physical or chemical properties.the designated temperature classes commence at 60c and increase in increments of 5c.note the classification adopted in this specification bear no relation to the general classification described inas 2768. a guide to insulating moulding applications, relative to these classifications, is set out in annex a.6texture and proportionsthe moulding shall be of even texture and of suitable proportions to ensure adequate electrical and physical properties for its normal service application.the assessment should not preclude the acceptance of voids or flow marks that do not significantly lessen the mechanical strength or electrical properties.7tests7.1generala separate sample shall be used for each test. the general conditions specified in clause 8.1 of as/nzs 3100 shall be observed during the testing of the moulding.7.2resistance to heat testwhere practicable the moulding shall be assembled as part of a complete appliance or associated sub-assembly. in other cases, the moulding may be tested separately, provided that either the method of use or the method of assembly is simulated. the moulding shall be placed in an oven and maintained for 6 h at the temperature appropriate to its class (see clause 5) plus 10c.the temperature of the oven during this period shall not vary by more than 5c.the moulding shall show no physical or chemical change likely to impair the safety of the equipment of which it forms a part.copyrightaccessed by university of south australia on 06 mar 20077.3water absorption testthe complete moulding shall be immersed in water at 20 c 5c for 48 h.the moulding shall not swell, delaminate, warp or show any physical change to a degree that would be liable to impair the safety of the equipment of which it forms a part.7.4resistance to white spirit testthe moulding or, in the case of a large moulding, a representative sample shall be immersed in white spirit at room temperature for 2 min.the moulding shall not blister, warp or show any physical or chemical change to a degree that would be liable to impair the safety of the equipment of which it forms a part. 7 as/nzs 3121:2002accessed by university of south australia on 06 mar 2007annex a(informative)guide to insulating moulding applicationsthis annex is intended as a general guide to the