Sub panel
#1
11-03-02, 03:28 PM
Sub panel
I am planning to install a sub-panel in my garage in the near future. Would it be possible to use the non-used 40 amp range breaker for this? What gauge wire should i run 8/3 10/3?? does it have to be in conduit or can i run NM sheathed from the main panel to the sub and at the sub from ceiling to panel in conduit?? like 4 FT. or so. The garage is attached via breezway. I live in MA.
#2
11-03-02, 05:07 PM
Member
Yes, you can use the range breaker. Use 8/3. In most areas, you need no conduit as long as the cable is not exposed to physical damage. But you'll need to check locally for the conduit rules. Call your building department. While you're talking to them, describe the relationship of the house and garage and ask them if they consider this an "attached" or "detached" garage. If detached, you'll need grounding rods. NM can't be run where subject to moisture -- whether or not in conduit.
#4
11-04-02, 05:59 PM
Member
There is no such calculation. Just estimate the load and convince yourself that you won't exceed the 40-amp breaker under any reasonable situation (you don't need to assume that everything will be on at the same time). This calculation is independent of how many breakers are in the subpanel or what their sizes are.
