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100a sub panel DIY

rwilner

Well-known member
Joined
Apr 26, 2013
Messages
104
Location
Boston, MA
Just finished terminating my garage sub panel. A few tips that are probably obvious to pros but not to us weekend warriors.

1. Locate the panel at a height that is comfortable for you to work on. Mine had to be a little higher than I would have liked with meant 3 hours on a ladder to terminate.

2. Run more wire length into the box than you think you need. This gives you options when laying out the circuits.

3. Afci breakers are 1.5x as long as regular ones. If you have a ground bus, locate it on the opposite side of where you load your afcis, if possible. (I failed to do this)

4. Tighten your romex connectors as you load them in the panel! It can get tricky to tighten them after its fully loaded.

5. Obviously - work carefully and neatly and label everything. I made up all my labels before I stripped a single romex jacket.

Any other tips you guys have for next time are welcome!

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theoldwizard1

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Joined
Feb 22, 2011
Messages
43,246
Location
SE MI
I think code says the bottom of the box must be at least 48" above the floor.

Most people like to have some spare slots on a new install.
 
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rwilner

Well-known member
Joined
Apr 26, 2013
Messages
104
Location
Boston, MA
I think code says the bottom of the box must be at least 48" above the floor.

Most people like to have some spare slots on a new install.
Yes, my issue is the walls are getting spray foam which makes futures a big challenge. So several of the circuits run to boxes with covers - those are my "blank slots"
 

Stuart in MN

Well-known member
Joined
Sep 8, 2005
Messages
23,164
Location
Minneapolis
The NEC doesn't specify a minimum mounting height for the panel, nor does it require leaving spare slots (although it's certainly a good idea.)
 
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