The 415V 63A 4-Pin Extension Lead Adaptor is compatible with any PAT tester and can be used to carry out earth bond continuity and insulation resistance tests on three-phase extension leads usually found in factories and other production facilities when used in conjunction with a 415V 63A 4-Pin appliance adaptor. It converts a 415V 63A 4-Pin plug to a 230V IEC socket and the short 30cm cable means there is minimal resistance. The adaptor cannot be used for load/leakage or touch current tests and should not be connected to the mains.