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Conductor ampacities and their temperature rating

from By Pierre McDonald, CET, Senior Regulatory Affairs, Underwriters Laboratories of Canada Inc.

Sizing conductors as per the Canadian Electrical Code (CE Code) has been a necessary skill requirement for electricians, designers and engineers for as long as I can remember. The rules associated with conductor ampacity have virtually remained unchanged over the years. In fact my 7th edition, 1958 Canadian Electrical Code Rule 4-006, Current Carrying Capacity of Wires and Cable, referred the user to Tables 1 through 4 in the same way the latest 22nd edition CE Code does. What has changed is the requirement to apply temperature ratings in a manner that aligns with the rules of the 2012 edition CE Code. more

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