OHS Code Explanation Guide

Published Date: July 01, 2009
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Part 36 Mining

Section 568 Ground fault protection

Because of the hazards associated with the arcing or short-circuiting of a power cable in an underground mine, any cable that exceeds 125 volts must include ground fault protection.

The intent is to provide automatic cut-off of the main power supply to ensure that arcing or sparking does not create the potential for fire or a methane gas or coal dust explosion.

Since re-setting the power supply could re-create the fault, the related ground fault protection system must be designed so that it is impossible to restore the power until the ground fault has been identified, repaired and tested to ensure the fault has been removed from the system.