Pardon my uneducated question, new to the codes...in short I want to add a subpanel, along an existing one. Here is the setup:
- There is a 200A service with a main service breaker and branch-breakers panel on the outside of the house. It is located on the garage external wall.
- A single 100A subpanel is feed across the garage by a multi-conductor cable (looks like SE cable AWG-2 3+1 AL). It's protected via a 100A breaker in the main panel.
- There is no main breaker in the subpanel, just branch brakers.
- The feeder cable runs across the garage ceiling to the subpanel through a drywalled "duct" ~3ftx1ft on the ceiling of the garage (there are other cables and AC air ducts there). About 35ft run.
I want to add a second 100A sub panel, in exactly the same location, side by side w/ the first one.
- What cable/wiring type can I use to feed it?
- Do I need a main breaker in the subpanel if I have a breaker in the main panel? It's all one "building".
- I would have a back entry to the main panel in a 2x4 wall - how to make the "turn"? (the existing feeder cable is just bent and enters via 1" adaptor).
- I have a 1/0-1/0-1/0-2 Gray Stranded AL SER cable I could use (prob overkill for 100A but I have it). Is it up to code to run it along existing feeder via this walled ceiling "duct"? On a 100A breaker?