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How to Wire a New Garage Project


By Dave Rongey - Summary:

Wiring a New Garage and Planning the Circuits – This contains all the basic electrical circuit requirements for the proposed garage…


Electrical Wiring for a New Garage

Home Electrical Question: I have a new post garage. It’s of pole construction, sided and roofed with metal panels. I plan on insulating and sheet rocking it.
I need a plan to wire it.
I have some experienced wiring help to deal with the digging and actual wiring. I know how to run wire through walls and underground.
I have 200 amp service. I have 4 “bays” for breakers under my meter.
I have 2 phase service.
I think I want to install a sub panel (this would be sub panel No. 1). Connected to this sub panel is the hot tub (it is wired through sub panel No. 2 further down the line) with 2 circuits (20 amps each), 1 is an out door outlet used on the BBQ. The other powers a lighting circuit in a shed. The shed and outlet were wired by a full time electrician.
The shed and hot tub sub panel would be serviced though the aforementioned sub panel (No. 1) through a 50 amp breaker.
The garage will have 1 220 VAC outlet (30 amp 220 VAC Small dryer style plug outlet)to service a compressor and a 220 VAC welder. Each of these do not draw more than 30 amps each. I plan on installing only 1 220 VAC outlet to service this equipment, so that both cannot be operated at the same time. I will have 9 110 VAC outlets around the perimeter of the garage with the possibility of adding 4 more in a possible expansion at some date in the future. I will have Florentine lighting overhead, 3 or 4 rows of 5 each 4′ 2 tube fixtures. There will be a garage door opener, hard wired or plugged to an outlet in the stringers (this is included in the outlet count above. there will be a 110 VAC LED light by the man door and an 110 VAC LED area light above the roll up door.
I Think I can do this with 100 amp breaker in the No. 1 sub panel to the garage (wire run underground through 1.25″ conduit) w/ copper wire to a breaker box rated at 100 amps with a main (100 amp)breaker. I have a fused disconnect for the welder and compressor that would be hooked up to a 50 amp breaker in this Main (sub panel No. 3?) panel. The wall outlets would be GFI protected from the first outlet down stream to the end, I think this should be divided into 2 separate circuits. The overhead lighting should be 2 desperate circuits too.
The local inspector told me I need 2 grounding rods hooked up to the box and 4 wire service from the No. 1 sub panel to the garage.
The pic is my MAIN under the meter I get 220 VAC with a tandem breaker in the middle; leaving 1 single space on each side.

This home electrical repairs question came from: Doug, from Port Orchard, Washington

See more about Home Electrical Repairs for Washington

Additional Comments: Nice site, easy to get around!

Dave’s Reply:
Thanks for your Home Electrical Question Doug

Wiring a New Garage Project

Planning Circuits for a Garage

  • This question contains all the basic electrical circuit requirements for the proposed garage project.
  • The exact circuits will depend on the electrical load required for the equipment and the devices that will be connected or used.
  • The electrical circuit schedule and plan should be drawn out and submitted for to the building department for approval.

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Be Careful and Be Safe - Never Work on Energized Circuits!
Consult your Local Building Department about Permits and Inspections for all projects.

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