The 415V 16A 4-Pin Appliance Adaptor works with any PAT tester to carry out earth bond continuity testing and insulation resistance testing on 415V 16A appliances with a 4-pin connection and the short 30cm length keeps resistance to a minimum. It converts a 415V 16A 4-Pin Socket to a 230V 13A Plug. It should never be plugged into the mains and is unsuitable for load/leakage and touch current testing.