panel breakers

I don't know about the CEC but the NEC would have to fall back on 110.3(B), installed per the manufacturer's instructions.
There are Cuttler Hammer and Square D breakers that are listed for one or two wires.
The QO breaker on the left is OK for 2 wires, one on each side of the screw. The other 2 are only OK with one wire.

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