OHS Code Explanation Guide

Published Date: July 01, 2009
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Part 40 Utility Workers – Electrical

Explanation of Rules Referenced from the ECUC, Second Edition

Rule 4-086 Test for potential

Electrical equipment or lines that have been isolated must have their isolation confirmed before they are grounded. The potential testing device used to confirm isolation must be tested immediately prior to checking the isolation to make sure that it is working properly. Testing of the potential testing device must be done according to the manufacturer’s specifications.

Although the use of potential testing devices is the preferred and most reliable method of confirming isolation, buzzing with a live line tool is acceptable for voltages greater than 5 kV. In situations where buzzing is of questionable reliability, in windy conditions or in areas with the potential for induction for example, isolation should be confirmed using a potential testing device.