Feeder Wire Size recommendations


Old 05-28-06, 12:16 PM
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Wire Size to garage recommendations

I am building a detached garage that I would like to have electricity installed.The run will be 115' from the box at the house.
- The garage will have two -1/2 HP garage door openers
- 2 hp 110v air compressor that I will have to use from
time to time as needed.I do not know how many amps
because there is no plate.
- I probably will be using 110v power tools occasionally ,one
at a time.(circular saw,3/8 drill,jigsaw,palm sander,etc..}
-Mini Fridge (1-2 amps?} that will be running most of the time
-Shop Vac once or twice weekly{5.7 amps)
-I will probably add a small 110v hot water heater in the future
Thats about it other than lights.I know I will never need a welder or larger air compressor as this small one serves my purpose.Whice wire would you recommend for my situation?

Last edited by allenb; 05-28-06 at 12:46 PM. Reason: title
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Old 05-28-06, 01:29 PM
Join Date: Mar 2005
Location: USA
Posts: 6,126
Feeder Wire Size recommendations

Don't take a chance on undersizing the wires.

You really don't know what you will want in the future or what a potential purchaser will want to use.

Mini-fridges can grow to regular refidgerators and/or freezers.

You find the need for new or different tools.

You get new hobbies or interests.

Your wife takes up ceramics.

You may want to heat it.

You may want more lights.

You decide that you want 220, etc...

You never know, but you only put in the feeder once (if you are lucky and/or smart).

Old 05-28-06, 03:03 PM
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#2al or #4cu on a 100 amp breaker. Run a 4-wire feeder and keep the grounds and neutrals separate in the panel. You DO need a main breaker panel, or a disconnect, for the detached building.
You also must install one (or two) ground rods for this structure, connected to the ground bar in the panel.
Old 05-28-06, 05:17 PM
Join Date: Jun 2002
Location: Brethren, Mi
Posts: 1,648
I go with speedy on this one, number 2 alum, 2-2-2-4 is cheap by comparison and delivers good solid service to a garage of that nature and there is plenty for future use without breaking the bank. As Speedy said you can use up to 100A breaker but my fave for this is a 60, 15$ and its a done deal for small garages. I did snag a couple QO 70's from the clearance table for 15 a piece the other day.

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