The 415V 16A 5-Pin Extension Lead Adaptor can work together with a 415V 16A 5-Pin appliance adaptor to carry out PAT testing on extension leads used in three-phase systems. It can apply earth bond continuity tests and insulation resistance testing as well as polarity checking and its short 30cm length helps keep earth resistance to a minimum. It is unsuitable for load/leakage and touch current testing and should not be plugged into the mains.