In-service safety inspection and testing of electrical equipment

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Figure B2 – Measurement of the insulation resistance between live supplyconductors and external metal parts of a typical Class II applianceFigure B3 – Measurement of the insulation resistance of a power boardSecretarial Note: In the Legend, item 2 “pin” should be “contact” or similarPage 23
APPENDIX CINSULATION RESISTANCE TESTING OF PORTABLE ISOLATING TRANSFORMERS(Normative)C1 GENERALInsulation resistance shall be measured on portable safety isolating transformers to 2.3.3.3.C2 INSTRUMENTATIONEither an insulation resistance meter or a PAT is required with the following characteristics:(a)(b)(a)A measuring circuit isolated from earth;Nominal measuring voltage 500 V d.c;Accuracy Class 5 or better.NOTE —(1) Class 5 denotes an accuracy of 5 %, full scale deflection.(2) For guidance on the requirements of insulation measuring equipment refer to AS/NZS 3000.That is, maintain terminal voltage within + 20% and – 10% when measuring a resistance of 1M.C3 TEST CONDITIONSInsulation resistance shall be not less than 1 M and shall be measured between:(a)Live supply conductors and accessible earthed parts of a Class I transformer or enclosingcase;NOTE — A method is shown in Figure C1.(b)(c)(d)Live supply conductors and accessible unearthed metal parts of Class II transformers orenclosing case;NOTE — A method is shown in Figure C1.Live supply conductors and the connections from the transformer output (secondary) winding;NOTE — A method is shown in Figure C2.The connections from the transformer output (secondary) winding and accessible earthedparts.NOTE — A method is shown in Figure C3.Page 24
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In-service safety inspection and testing of electrical equipment

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