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Reply by Keith Kelly

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Keith Kelly

330 posts in 2059 days


#1 posted 01-30-2017 03:03 AM

I am in a 2 car garage too.

+1 for sub panel in garage so you can add things easily later.

Also, +1 and a safety note on Firewood’s advice:

When putting 2 circuits in a box, put them on a 2-pole breaker. That way, when you do maintenance down the road, you have to turn off BOTH circuits (and avoid accidentally leaving one on while you’re working in that box)

(I realize you only asked about 220v circuits, but this rabbit trail connects too nicely with the clarification above)

On a similar note, google “multi wire branch circuit” or “shared neutral” or “common neutral.” They are only problematic when set up wrong, so before you do this, do plenty of research. Some tips: Both breaker handles need to be connected (as in the paragraph above), and each breaker needs to be on a separate phase.

Here’s a link with some info: http://www.ahouseonarock.com/midlothian-home-inspector/what-is-an-mwbc/

I’m using a shared neutral approach behind my miter saw area. In case it inspires you, the setup below is:
  • that’s the subpanel on the right
  • 2 MWBC’s in the upper conduit behind the saw. Circuit A is to the left, B is to the right.
  • 2 more MWBC’s in the lower conduit. Circuit C on the left, D on the right.
  • 1 more non-MWBC on a switch going up to the shop vac.

The reason for this layout is that I can easily plug in 2 powerful, portable things anywhere along that wall without tripping any breakers or myself over a cord. (usually ends up being the router table or drum sander paired with a dedicated vacuum) And, copper is much cheaper now than it was 2 years ago.

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So, on the 220v circuit question… Yeah, I’d recommend 1 or 2 220v circuits. Those tools seem to be cheaper on Craigslist.

-- Keith | Subscribe: https://www.youtube.com/c/KeithsTestGarage


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