Try as I might, I've always had difficulties finding information about Canada's regulations regarding unlicensed carrier current operation.
That is, until I stumbled upon RSS310. Apparently, Industry Canada considers carrier current for use inside buildings, and as such, does not consider it broadcasting, per say.
Powerline conducted radiation(powerline connected transmitters)
BETS-1(3.6)
The radio frequency voltage appearing on each power line shall not exceed 250 microvolts on any frequency from 450 kHz to 30 MHz. Measurements shall be made from each power line to ground both with the equipment grounded and with the equipment ungrounded. Conducted measurements shall be made using a 50 ohm/50 μH line impedance stabilization network (LISN). Refer to Canadian Standards Association (CSA) CAN3-C108.1.5-M85 for the description of a suitable LISN.