In-service safety inspection and testing of electrical equipment

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2.3.3.2 Testing of insulationInsulation resistance tests shall be performed with the switch in the 'on'position. If the equipment must beenergized to close or operate a switching device, then a leakage current test shall be performed.Equipment shall be tested:(a)(b)With a leakage current test performed at rated voltage with values not exceeding those specified inTable 1; orWARNING – When performing leakage current tests with the equipment energized, the protective earthconductor may be live and present a shock hazard.Alternatively, measure insulation resistance in accordance with Appendix B at 500 V d.c. oralternatively, to avoid the equipment apparently failing the test because the metal oxide varistors(MOVs), or electro-magnetic interference (EMI) suppression has triggered, for equipmentcontaining voltage limiting devices such as MOVs, or EMI suppression, at 250 V d.c. Theinsulation resistance between parts of the equipment shall be as specified in Table 2.TABLE 1 - Leakage current limitsEquipmentClass IClass IIPortable RCDs with functionalearthCord extension sets, portableoutlets and portable RCDsLeakage testMeasure the current flowing in theprotective earth conductorMeasure the current flowing betweenaccessible unearthed metal and earthMeasure the current flowing in thefunctional earth conductorMeasure the current flowing in theprotective earth conductorMaximum leakagemA512.51EquipmentClass IClass IITABLE 2 - Insulation resistance limitsInsulation testMeasure between live parts andaccessible earthed partsWith live and neutral conductorselectrically connected, measurebetween live parts and any accessiblemetal partsMinimum insulationresistance M1.01.0Portable RCDs with functionalearthMeasure between live parts and thefunctional earthing conductor0.1Cord extension sets, cord sets,portable outlets and portableRCDsMeasure between live parts and theprotective earthing conductor 1.0Mineral insulated metal sheathheating elementsMeasure between live parts andaccessible earthed parts0.0113 of 46
2.3.3.2.1Where equipment contains, by design, resistors installed between live conductors and earth, values ofinsulation resistance not less than the effective value of the resistors are acceptable provided themanufacturer can prove that the resistors are part of the design.2.3.3.2.2The insulation resistance of RCDs with functional earth (FE) connections shall be not less than 0.1 M asshown in Table 2. Alternatively, portable RCDs which require the supply to be closed, and units with a FEconnection may be tested for leakage current with a maximum allowed value of 2.5 mA as shown in Table1. (A functional earth in an RCD is a connection with earth to ensure the correct normal operation of theRCD.)2.3.3.3 Testing of plug packs, power supply, portable isolation transformers and power packsTesting shall be performed between the following components as appropriate:(a)(b)(c)(d)2.3.3.3.1Live supply conductors and accessible earthed parts of the Class I transformer or enclosing case;Live supply conductors and accessible metal parts of Class II transformers or enclosing case;Live supply conductors and the connections from the transformer output (secondary) winding;Connections from the transformer output (secondary) winding and earthed accessible earthedparts. This test is not applicable for equipment with ELV output which is connected to earth directlyor by a resistive component.The insulation resistance between appropriate parts specified above shall be not less than 1 M.2.3.3.4 Test for operation of RCDsRCDs shall be tested in accordance with Appendix D. The maximum tripping time for RCDs measured inaccordance with Appendix D or using an external timer circuit as described in Note 2, shall not exceedthe values shown in Table 3.NOTE —(1) The test for operating time using a.c. for a.c. and d.c. pulse sensitive RCDs is acceptable as d.c.calibration is linked to a.c. calibration and verified by type test.(2) Portable RCDs which are permanently wired to terminals in equipment may be tested by push buttononly, observing the operating time, which should be ’without undue delay’. In case of doubt, use anexternal timer circuit, capable of detecting the test current start and finish, to measure disconnecttime. (The test button current is assumed to be 200 % x rated residual current).(3) The test methods for RCDs in 2.3.3.4 and Appendix D of this Standard may be used to verify RCDoperation where required in other Standards for initial verification or periodic verification at intervalsspecified in those other Standards, for example AS/NZS 3000, AS/NZS 3019, AS/NZS 3012, AS/NZS3001, AS/NZS 3002.TABLE 3 - Maximum tripping timesRCD typeTest currenta.c. mAMaximum tripping timemsType I 10 40Type II 30 3002.3.3.5 Polarity of rewireable plugs and cord extension socketsThe correct polarity of the individual wires in rewireable plugs and cord extension sockets is shown in (a)and (b) below, and additional details of older and overseas schemes are provided in Appendix F. Theindicative frequency of test is provided in column (h) of Table 4.14 of 46
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In-service safety inspection and testing of electrical equipment

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