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Basic Two Car Garage Subpanel Supply Wire, Capacity, Wisdom?

thrifty bill

Well-known member
Joined
Jan 12, 2011
Messages
490
Location
The Mountains of North Carolina
I have a detached two car garage (24 x 26) right now with no power run to it. The garage is really basic, it doesn't even have a garage door (it never had one, and it is at least 40 years old). I plan to run a subpanel in the garage, off the service at the house. A garage without power is pretty stupid IMHO. The garage is about 30 feet away from the panel on the side of the house.

The house is actually a duplex, each unit of the duplex has a fairly modern 150A breaker panel, mounted on the back porch (porch is covered, but not enclosed). So I will be feeding the garage from one of these two panels.

I am looking to build a separate workshop later, so this garage shouldn't have a lot of load. I am figuring two outlet circuits (20A each), one lighting circuit (15A) and a 20A 240 circuit for an air compressor.

Right now, I plan to put my three motorcycles in the garage, plus my two pull behind motorcycle trailers, and my Handy pneumatic motorcycle lift table.

Long term, this garage will hopefully keep most of the family stuff out of the workshop: hold the two family cars, lawn equipment and bike trailers. The rest of the motorcycle stuff would likely go to the workshop. I just put a new roof on this garage, so I better keep it! (Garage door goes on next week).


The price of wire is getting insane. So I am debating the gauge of wire to use. I guess I could run 8 gauge, limits me to 40A, or 6 gauge (50A?). Plan to run the feed underground, in PVC conduit.

Debating whether to run THWN wire, or UF, or whatever. Cost will be a consideration! If run THWN, I am thinking I will run red, black, white and a bare wire. And then a separate ground spike off the sub. Stranded versus solid? Conduit size recommendation?

Would appreciate the wisdom of the list on this one. I know I will likely regret putting too little supply to this garage.
 
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ajaynejr

Member
Joined
Feb 1, 2011
Messages
14
I say use #6 copper wire for 60 amps @ 240 volts or two allotments of 60 amps @ 120 volts. This will enhance the resale value of the house if the next owner wants to use the garage for his workshop. (The 4'th wire for ground can be #10.)
 
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Aceman

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Joined
Jan 28, 2007
Messages
2,513
Location
Eastern Oregon
60 amp breaker, #6 Copper THWN with a #10 ground in an 1.25" pvc.

If you have visible ground rods at your main service panel, I'd run a #4 bare copper from your garage panel to these rods and save yourself the trouble of having to drive any at the garage. That #4 bare doesn't need to be in conduit, so you can just lay it in the ditch alongside your pipe.
 
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thrifty bill

Well-known member
Joined
Jan 12, 2011
Messages
490
Location
The Mountains of North Carolina
I like the point on resale. Also the idea of using 10G bare. I plan to run 240 for sure. And if I can't swing the expense of a separate shop, I should be fine on capacity (been spending a lot of $$ lately, new metal roof is going on the house today)...
 
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