Because running cable inside a finished wall is impractical in this situation (there is no attic and access to the floor below is difficult), I'm planning on installing a surface mounted raceway. Inside this raceway, I would like to put
- 2 X 20A dedicated circuit for window/portable air conditioners
- 1 X 15A circuit for outlets.
- Do I use THHN wire for this or can I run sheathed cable inside the raceway? From what I've read, THHN is better because of heat dissipation but I'm not sure.
- Do I have to derate? It seems that I have more than three conductors (3 hots + 3 neutrals).
For code purposes: Quebec, Canada