GES at separate building

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Senior Member
New Hampshire
Of those of you that have been debating my questions on sub panels in the NEC forum here is another question on the same sub panel. This panel being installed by a homeowner also does not have the required GES.Because this garage is only 10' from the house and only about 15' from the main house GES can I use the existing ground rods to establish the GES for the garage? (GEC= grounding electrode system)


Staff member
Plano, TX
Re: GES at separate building

250.32 holds your answer. It all depends on whether or not any metalic paths exist between the two structures.

If a metalic path does not exist, you have two options.

1. Run 3-wire (P-P-N) plus ground.
2. Run 3-wire, add a GEC and electrode then bond neutral.

If a metalic path exist.
Same as 1 above.

You may extend the electrode to the garage and treat it as a metalic path and use option 1. You would not bond the neutral. Bond GEC to panel ground.

[ March 10, 2003, 07:52 PM: Message edited by: dereckbc ]
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