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 4-130 General application

Subrule 4-130(1)

Electrical equipment and lines are sometimes operated at less than their design voltage. In such cases a utility employee can establish the safe limit of approach distance based on the operating voltage rather than the design voltage. Despite this, all other workers must continue to use the design voltage in determining the safe limit of approach distance that applies to them. Also see subrule 4-130(4).

Subrules 4-130(2) and 4-130(3)

To simplify the use of limit of approach distances, all voltages between 750 volts and 41.4 kilovolts must use the distance required for 4.16 kilovolt systems.

To ensure worker safety, the next higher nominal voltage level must be used if the operating voltage of a system exceeds the nominal voltage shown in Tables presented in the ECUC. Also see subrule 4-130(4).

Subrule 4-130(4)

Subrules 4-130(1), 4-130(2) and 4-130(3) do not apply if the employer calculates the approach distance based on the operating voltage and insulating level of the electrical equipment or lines. The employer could have an engineer calculate the limit of approach distance using accepted mathematical models or recognized national or international standards. The resulting calculation or report should be available should an officer wish to confirm the basis for the distance being used.