Unless the NEC has changed recently, it's legal in the US to use 20A breakers (with appropriate wiring e.g. 12ga or larger) to supply 15amp receptacles. I don'

Unless the NEC has changed recently, it's legal in the US to use 20A breakers (with appropriate wiring e.g. 12ga or larger) to supply 15amp receptacles. I don't know why the NEC allows this given that the practice is banned in Canada despite identical circuit breakers, wiring, receptacles, and electrical devices being used in both countries.