Fitter avoids injury from plug failure

A maintenance fitter at a longwall operation has avoided serious injury after a tailgate Armoured Face Conveyor (AFC) feeder cable was blown out of the back of a 3.3 kV flameproof restrained plug.

A maintenance fitter at a longwall operation has avoided serious injury after a tailgate Armoured Face Conveyor (AFC) feeder cable was blown out of the back of a 3.3 kV flameproof restrained plug.

According to safety inspectors, the plug and cable at some stage had received a force and a bending movement which led to undue tension on the 6 mm retaining screws causing separation of the cable’s phase contacts at the thimbles. This resulted in heating and arcing in the interior moulding where the contact sockets connected to the cable thimbles, and there was a short circuit fault as the cable was expelled from the back of the plug.

The Queensland Mines Inspectorate has issued a Safety Alert over the incident and a separate incident at a different mine where a cable plug was blown out of a 3.3 kV cable receptacle in which it had been inserted and restrained.

Contact:

Neville Atkinson

Inspector of Mines

07 4938 4123

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