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Ground Wire in Every Conduit?

Posted by Danvirsse (My Page) on
Mon, Aug 22, 11 at 21:09

We are in the process of rough wiring our 180 yr old home. At the suggestion of our Electrical Contractor, we will be installing 2 large juction boxes (1 in the attic and 1 in the basement) and running each 20Amp circuit to one of these 2 boxes. There will then be PVC conduit with THHN/THWN running from the Juction boxes to the Panel. Of course, the junction boxes will be sized appropriately for the number of conductors housed. Our question is if 2 conduits run from a junction box to the panel due to space constraints and allowable fill capacities, do we need a ground in each conduit or just 1 of the conduits?


Follow-Up Postings:

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RE: Ground Wire in Every Conduit?

You must run a ground in the same conduit as the rest of the circuit conductors.


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RE: Ground Wire in Every Conduit?

"There will then be PVC conduit with THHN/THWN running from the Juction boxes to the Panel. "

You are likely to encounter conductor derating requirements for the large number of current carrying conductors in the home run conduits.


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RE: Ground Wire in Every Conduit?

Is there a reason you aren't just putting subpanels in the basement and the second story? Seems a lot easier to pull 1 line than a bunch. It also would make future expansion a lot easier.


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RE: Ground Wire in Every Conduit?

Bill - Thanks for the input. I'm not sure why the contractor didn't suggest the subpanels, but I'll ask him. They seem like a good idea, especially since we're going to have to run multiple conduits from each junction box to the panel due to the space constraints and derating.


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RE: Ground Wire in Every Conduit?

Can't put a panel in the attic unless there are permanent stairs leading to it. there may not be enough space in the basement location to fit a panel with clearance requirements what they are.


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RE: Ground Wire in Every Conduit?

I just met with the electrical contractor again tonight and, ionized, you are exactly right. No space in the basement with the appropriate clearances. Ditto the 2nd floor, since it a cape cod style. Guess we're going to be staying with the junction boxes.
Thanks to everyone.


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RE: Ground Wire in Every Conduit?

Hallway wall on the second floor? The folks who wrote the NEC are less concerned about appearance than about their approach to safety.


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RE: Ground Wire in Every Conduit?

Why not cable? Is conduit specifically required in your area?


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