Electrical Wiring in the Home/Size &t ype

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Expert: Greg Hughes - 11/10/2009


Question
I have a new detached garage 150 ft from main box. I want 220& 110 underground (no conduit)type wire. I want run a small 220 air compressor and  110 power tools. What size wire & type?

Answer
What you need to know is how many amps you plan on using. Add up your lighting, your air compressor, and at least two 20 amp circuits for power tools. Then think about what you might like to add in the future, such as heating, cooling, welder, etc.

You need to install a subpanel to distribute the circuits. The ground and neutral do not get bonded at the subpanel.

If you are not using conduit you will want underground direct burial wire. You will want to go up one size for the rating of the amps you want.

For example; if you go with a 50 amp subpanel you will want to run #4 copper, if you go with a 30 amp subpanel you will want #8 copper.
About Electrical Wiring in the Home
This site answers questions related to home electrical wiring, home wiring, general electrical help,and other electrical questions related to aleternating current (AC). You can find help on the National Electical Code, home electrical issues, wiring electrical outlets, installing lighting, electrical grounding, and general electrical help for do-it-yourself projects not require an electrician. If you do not see your home electrical wiring question answered in this area then please ask your electrical wiring question here

Electrical Wiring in the Home

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Greg Hughes

Expertise

Residential Electrical including Appliances and HVAC with 31 years experience.

Experience

Started training as an electrician in 1979, worked for major companies and the government.

Education/Credentials
Graduated from Electrician's School, Carrier Training, and various specialty schools.

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