MM425 is a special plug cover used to establish a pilot circuit to allow the substation to be energised for testing prior to a dragline shift.  A resistor is encapsulated in the polyurethane and connected between an earth bushing and the pilot pin. The Customer can request resistance value or diode to suit. 

This unit is tested and certified to AS and supplied with a copy of the individual test certificate. 

Mountings & pilot pin to match receptacles as required. Earth bushings & engraved cover made from brass and high density polyurethane used in manufacture of the test cap. Colours are available to match voltage of the outlet being tested. A transport box of polyurethane is provided to reduce possible damage in transit.