I'm continuing to fix the issue introduced by someone else (Why run the same phase twice to a series of outlet?).
The other room they did has this setup:
- a 3-conductors cable brings the same phase twice, from a single breaker
- one device is a 120V heater/fan that requires 13A
- the rest is lighting and a power outlet
- everything is AWG 14
(so, with the heater/fan on, we go above 15A. And anyway, the heater spec asks for a 20A circuit)
I understand electricity well, but I know nada about code. Since I don't feel like running a new cable, I though this would work:
- split the 3-conductors cable into a MWBC 20A (I'll ask a competent electrician for this, I don't open panels)
- use 1 phase for the heater/fan (it only needs 120v, but has two switched inputs)
- use the other phase for everything else
What code issues (if any) would this run into? Diagram shows what I'm aiming for. The blue box is the four gang box. I'd rather no rip out anything in the walls.
Location is Quebec, Canada.
Update: There's another cable I had dismissed, 2 conductors and bare ground, in 12 AWG, but the wires are coloured Black and Red. So I expected this to be only meant for 240v. See second picture. Maybe I can use this dedicated circuit for the heat/fan.
Update 2: Thanks, many excellent answers. I added the diagram that show what I must change.