OHS Code Explanation Guide

Published Date: July 01, 2009
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Part 21 Rigging

Section 293 Load ratings

Subsection 293(1)

The “maximum load rating” is the maximum weight that a piece of rigging is authorized by the manufacturer or a professional engineer to support. It is also known by a variety of other terms such as Working Load Limit (WLL), Safe Working Load (SWL), rated load value, resultant safe working load, rated capacity, and maximum working load.

The maximum load rating is not the breaking strength of the piece of rigging. An employer must ensure that the load rating of the piece of rigging is based on the appropriate factor of safety.

Components can be marked in a variety of ways, i.e. stamping, etching, embossing, printing, tagging. When choosing a particular marking system, consideration should be given to legibility and durability.

Subsection 293(2)

If the maximum load rating cannot be marked on a rigging component, information about the component’s maximum load must be made available to the lifting supervisor and to the operator before commencing the lifting operation. This information must also be readily available to other workers involved in the lifting operation.