In-service safety inspection and testing of electrical equipment

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APPENDIX ATEST OF EARTHING CONTINUITY(Normative)A1 GENERALThe test of earthing continuity resistance shall be conducted to 2.3.3.1 during in-service testing ofall Class I equipment. The test shall include flexing and straining at points of entry and clampingpoints by the application of reasonable combination of push/pull and rotary movements. This maydetect broken strands or loose connections.A2 INSTRUMENTATIONFor 'in-service'testing, either of the following shall be used:(a)(b)An ohmmeter of accuracy Class 5 or better; orNOTE — Class 5 denotes an accuracy of 5 % full scale deflection.An equipment tester (portable appliance tester or PAT) with one or more of the following testcapabilities:(i)(ii)(iii)12 V maximum, test current in the range 100 to 200 mA;NOTE — This mode is commonly known as an 'earth continuity'test.12 V maximum, test current of 10 A The test duration is limited to the maximum timerequired for measurement;NOTE — This mode is commonly known as a 'routine test'.12 V maximum, at 1.5 times the rated current of the appliance or 25 A, whichever isthe greater. The test duration is limited to the maximum time required formeasurement. The use of this option is not recommended and caution should beexercised when considering its application to an item containing electroniccomponents.NOTE — This mode is commonly known as a 'type test'.A3 TEST CONDITIONSA3.1 Earthing continuity resistance shall be measured between any accessible earthed parts,including rotating metal parts, and the earth pin of the plug. The resistance shall not exceed 1 .A3.2 For cord sets, cord extension sets, portable outlet devices, and portable RCDs, theresistance between the earthing connections of the plug and outlet(s) shall be measured. Theresistance shall not exceed 1 .NOTE —(1) Figure A1 shows one method of testing resistance.(2) For the definition of accessible earthed parts, see 1.4.1.(3) Values measured (with the flexible cord included), are usually found to comply with a value ofless than 0.5.(4) Some testing personnel remove the active and neutral pins of the test plug depicted in figureA2, to ensure the earth pin is sufficiently well gripped by the power board earth contacts.Page 19
Figure A1 – Measurement of the earth continuity resistance between accessible earthedparts and the earth pin of the mains plugFigure A2 – Measurement of the earth continuity resistance between the mains plug earthpin and the earthing contacts of a power boardPage 20
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Page 11 and 12: PUBLIC COMMENT DRAFTFOREWORDIn-serv
Page 13 and 14: electrical installation and falls w
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Page 17 and 18: 1.4.16 Live partsLive parts include
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Page 21 and 22: 2.3.3.2.1Where equipment contains,
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In-service safety inspection and testing of electrical equipment

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