When testing long extension leads it is very common for most portable appliance testers to indicate a fail on earth continuity, this may lead to false failures & incorrect records. The earth resistance limit for earth continuity stipulated in the IET Code of Practice 5th Edition allows 0.1+R ohms with R being the resistance of the cable. There.. Testing and tagging an extension lead is one of the simpler tests to conduct. You'll find that all appliance testers that conform to Australian Standards AS/NZS 3760 will have this test available, and is usually completed by the push of a button. Similarly to other items, the visual inspection is most important part and an area where defects.
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Quick tips on why your PAT machine might be showing a fail when testing an extension lead.. For testing 110V extension leads, an adaptor with a 110V male plug to IEC connector is usually used. This will also allow a polarity test to be carried out, although the test is unnecessary for an extension connected to a CTE supply. Fig.3 PAT test on 110V extension lead Fig.4 Adaptor used to connect dual voltage PAT tester to 110V supply
