Test Your Knowledge of the Canadian Electrical Code – Part 1 — Motors & Generators

Apr 25, 2021

Take this opportunity to test your knowledge of the Canadian Electrical Code – Part 1. Last week we published questions about motors and generators. You’ll find the answers in EIN articles written by our code experts — mainly Bill Burr and Terry Becker — and of course in your own best practices. Good luck and share your results with our Facebook group: Canadian Electrical Contractor Discussions.

Motors and Generators

Q: What determines the insulation temperature rating and ampacity of motor supply insulated conductors. 

A: Rule 28-104 outlines the use of Table 37 to determine the insulation temperature rating and ampacity of motor supply insulated conductors. 

Q: Where do you refer to determine the ampacity rating of insulated conductors supplying individual motors, two or more motors, or feeder and secondary insulated conductors?

A: Rules 28-106 to 28-112 outline the use of Table 27 to determine the ampacity rating of insulated conductors supplying individual motors, two or more motors, or feeder and secondary insulated conductors. A chart in Appendix B will help with these calculations.

Q:  Does each motor branch circuit, starter or controller, and each require a separate disconnecting means. A single disconnecting means may serve more than one function or motor grouped on a single branch circuit.

A: Rule 28-600 requires that each motor branch circuit, starter or controller, and each motor be provided with a separate disconnecting means. A single disconnecting means may serve more than one function or motor grouped on a single branch circuit.

Q: Does a generator be driven by electricity supplying a 2-wire grounded system need a protective device that disconnects both insulated conductors?

A: Rule 28-904 requires a generator not driven by electricity supplying a 2-wire grounded system to have a protective device that disconnects both insulated conductors.

Go HERE to discuss