OHS Code Explanation Guide

Published Date: July 01, 2009
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Part 36 Mining

Section 577 Emergency energy

Braking systems using air or air-over-hydraulic mechanisms must have an emergency energy source to ensure service brakes can effectively stop the mobile equipment and hold it on any grade on which it operates. Spring coils are often used as a back-up if the hydraulic or compressed-air pressure drops drastically. Under normal conditions, hydraulic or pneumatic pressure keeps the springs compressed, releasing the wheels to move.