OHS Code Explanation Guide

Published Date: July 01, 2009
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Part 29 Workplace Hazardous Materials Information System (WHMIS)

Section 402 Transfer of controlled products

Controlled products in storage vessels or transferred in piping within the workplace are additional situations in which other means of labelling may be used. Warning signs, placards, symbols, colour coding, process flow charts or piping diagrams are all examples of the types of labelling that are acceptable if, when combined with worker education, workers are able to understand the meaning of the system.

An example of a labelling system is presented in the Canadian General Standards Board (CGSB) standard “Identification of Piping Systems” (CAN/CGSB-24.3-92). This system uses a combination of colour coding and WHMIS pictograms to label piping. The employer may use this standard to implement a standardized labelling system for piping. However, the standard does not fully address the needs of individuals who are colour blind or illiterate. Alternative means would be necessary to accommodate these individuals. The employer may also develop an in-house labelling system as long as workers are trained to understand the system.