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Old 02-27-2011, 05:39 PM   #1
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wiring an outbuilding


I want to wire a workshop that is 30 feet from the main panel. I wanted to add a 30 amp GFCI to the main panel and run wire underground to the shop and a subpanel with two circuits 15 amp for lighting 20 amp for saws. What size wire do I need to use and is 30 amps too much or will 20 get me by running one tool at a time?

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Old 02-27-2011, 06:23 PM   #2
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wiring an outbuilding


This is a detached building? If you are going though all the trouble of trenching a line I would use a minimum or #6 and a 60 amp sub panel. That way you will have future expansion needs without having to do it over in the future. You do not need to use a gfci to feed the sub panel. The individual circuits that are run from the sub panel may need gfci protection.

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Last edited by teamo; 02-27-2011 at 06:25 PM.
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Old 02-27-2011, 07:23 PM   #3
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wiring an outbuilding


I agree with teamo. Unless local codes dictate, there is no need to used a gfci breaker to feed the building.
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Old 02-27-2011, 08:04 PM   #4
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Thanks for your response and yes it is a detached building and will be fed from the garage. What about ground rods - necessary?
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Old 02-27-2011, 08:30 PM   #5
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Quote:
Originally Posted by Zman1 View Post
Thanks for your response and yes it is a detached building and will be fed from the garage. What about ground rods - necessary?
Yes.
2 hots, a neutral and a ground wire needed from the garage to the building.
Ground and neutral seperate in the building panel, gorund rod connecto ground from the garage.
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Old 02-27-2011, 09:47 PM   #6
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jbfan i am thinking of doing the same thing, but i do not understand the need for the ground rod it the subpanel has a ground running to it from the main panel. could you please explain the need for this.
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Old 02-28-2011, 07:24 AM   #7
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Originally Posted by bluebird5 View Post
jbfan i am thinking of doing the same thing, but i do not understand the need for the ground rod it the subpanel has a ground running to it from the main panel. could you please explain the need for this.
Because the NEC requires it.

Mark

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