This is direct from ESA last month. Please note this is the CANADIAN code forum. Rules are different in NEC world.
If wiring a dedicated circuit can 1/2 of a multiwire circuit be used as a dedicated circuit.
Example can a 14/3 be pulled to the fridge receptacle and black and white for fridge and then red and white used for lighting?
Is a double pole breaker required or can two singles be used if proper installed on opposite legs of the service?
--- (yousefr) 9/16/2010 9:48:36 AM
1. Each side of a 3-wire circuit can be considered as a separate dedicated circuit if they are properly connected to different phases and have common neutral.
2. Yes, a double pole breaker or two singles can be used (if properly installed on opposite legs of the service) for a 3-wire circuit.
Reference is to the Ontario Electrical Safety Code 24th Edition/2009.
Ray Yousef
Assistant Code Engineer