Sub Panel Ground

green70December 19, 2013

7 or 8 years ago I had an electrician move the main panel from my house to the garage and install a sub panel in the house with buried conduits in between to eliminate overhead wires. We are currently doing a basement remodel and need to add space to the sub panel in the basement to make room for the arc faults. The electricians that have come out to look said that the previous guy did not install a ground between the two panels. There are grounding rods at both panels and a cold water bond at the sub panel but nothing between the two. My current electrician cannot get a fish tape through the 2" conduit to pull a new ground wire. There is an empty 1" conduit in the same trench as the 2". Can this be used to pull a new ground wire? We just spent thousands of dollars installing pavers and landscaping over the area between the two panels. Do I have any other options other than digging up my new landscaping? Also, it there any danger in leaving it the way it is if the inspector does not catch it?

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green70

BTW, I made the mistake of not having any of the original panel relocation this inspected. For the current remodel we have pulled all of the proper permits. The inspector has not yet brought up this issue and we are almost ready for final inspection.

    Bookmark   December 19, 2013 at 8:09PM
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randy427

The ground cable must be run in the same conduit as the two hot legs and neutral.
Your electrician may be able to pull the existing wires out and then pull all four in together, reusing the current ones plus adding the new ground.
Yes, there is danger in ignoring the grounding requirement. Danger to life, property and to the license of your electrician.

    Bookmark   December 19, 2013 at 10:14PM
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Ron Natalie

if this was done under the 2005 or earlier version of the code, there was an exception that permitted the ground wire not to be run if there were no other metallic paths (water, other systems) between the buildings.

    Bookmark   December 20, 2013 at 10:23AM
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Ron Natalie

if this was done under the 2005 or earlier version of the code, there was an exception that permitted the ground wire not to be run if there were no other metallic paths (water, other systems) between the buildings.

    Bookmark   December 20, 2013 at 10:27AM
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