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The internal clamps sit basically flush within the box.....I'm not totally sure how they're factored in calculations in Canada, but I'm going with a 3" box.

Thanks for your concern. Yes the instructions to say to have a gfci protected circuit. The circuit will be GFCI protected upstream via a 20 amp gfci outlet before entering the switch box.

Thanks for info. Oof on the box size. I don't think I can even get a 3 1/2 inch deep box where I am.... I'm only finding 3"..... Also, going off the calculations here my outlet box has 10 "wires" (2 black, 2 white, 1 ground, 1 red, 2 for device, 2 for clamps). I'm prepared to get a 3 inch box...

I'm installing a hardwired towel warmer and I thought I would include an outlet on the same cable because the towel warmer needs a junction box anyway. Can I run a 12/3 with both black/red hot, black attached to the switch, to the outlet connected to red, and continue the black to the towel...