OHS Code Explanation Guide

Published Date: July 01, 2009
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Part 36 Mining

Section 574 Standards

The intent of this section is to ensure the safety of underground mine workers who often work in mines where road and ramp gradients are much steeper than those seen in surface operations.

Subsection 574(1)

CSA Standard CAN/CSA M424.3-M90 (R2007), Braking Performance – Rubber-Tired, Self-Propelled Underground Mining Machines, has been adopted in total despite the specifications of section 573(1). The Standard applies to all underground mining machines with rated speeds of 32 kilometres or less and having a rated gross mass of 45,000 kilograms or less.

According to the Standard, such underground equipment will require the Director’s approval prior to being used in an underground mine.

“The test course for service, secondary and parking brake systems shall consist of a hard dry surface with a well-compacted base. The test surface shall
(a) not exceed a 3 percent grade at right angles to the direction of travel, and
(b) have a uniform down grade of 20 percent, plus or minus 1 percent.

The approach to the test course shall be of sufficient length, smoothness and uniformity of grade to ensure the required machine speed is reached before the brakes are applied.”

Subsection 574(2)

Under certain conditions the Director may exempt a rubber-tired, self-propelled machine from subsection 574(1). Such conditions could include restrictive safe operating procedures or a certification from a professional engineer.