Rules 8-104, 8-304, and 62-114

When an overcurrent device is located in an assembly such as a fused switch or a panelboard, the assembly is required to be marked for continuous operation of its overcurrent devices in accordance with the requirements of CSA C22.2 No. 4 or CSA C22.2 No. 29.

Fused switches and circuit breakers not marked as suitable for continuous operation at either 80% or
100% of the rating of their overcurrent devices are considered to be suitable for continuous operation
at 80%.

Source: Appendix B, Rule 8-104, CSA C22.1:21, Canadian Electrical Code, Part 1 (25th Edition), Safety Standard for Electrical Installations. © 2021 Canadian Standards Association. Please visit