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Old 03-11-2008, 06:01 AM   #1
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Grounding a metal house.


What is the acceptable method to ground/earth ground a new metal house in 2008. They didn't install an Ufer ground when they poured the basement floor.


Last edited by RobertS; 03-11-2008 at 06:48 AM.
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Old 03-11-2008, 06:07 AM   #2
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Grounding a metal house.


What parts are metal?

For 1 & 2 family dwellings a Ufer is not yet mandatory in NYS as it is under the 2008 NEC.

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Old 03-11-2008, 06:13 AM   #3
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Grounding a metal house.


The main frame is metal I-beam, The roof, and sides are metal, and it has metal studs inside on a plywood floor. I-beams, and studs are all 6" if that maters. At this point he is installing MC boxes, and planning to run romex. I'm not touching this one. I told the home owner to have his electrician come over, and show him what he needs. So far he has waisted about $1000 on electrical stuff.

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Old 03-11-2008, 06:17 AM   #4
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Grounding a metal house.


This would be a typical grounding/bonding scheme. Just make sure the (structural) building steel is bonded correctly.

Are you doing this or are you having a contractor do it?
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Old 03-11-2008, 06:25 AM   #5
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Grounding a metal house.


The home owner is a fool, and a constant argument I'm not touching this one. He is installing boxes for MC/BX and is planning to use Romex. He found the boxes for free some where. An Ufer, isnt manditory but it would have been a good idea, and cost effective.

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Old 03-11-2008, 06:56 AM   #6
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Grounding a metal house.


Quote:
Originally Posted by RobertS View Post
An Ufer, isnt manditory but it would have been a good idea, and cost effective.
Absolutely.
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Old 03-11-2008, 10:04 AM   #7
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Grounding a metal house.


That's a lot of romex to tear out after it fails inspection.
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Old 03-11-2008, 10:50 AM   #8
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Grounding a metal house.


Why would it fail inspection?????
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Old 03-11-2008, 08:58 PM   #9
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Grounding a metal house.


I don't use Romex, but can't you use take-all connectors in this type of application? Speedy, I think the worry is that the boxes have 1/2" KO's and not romex hits.
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Old 03-11-2008, 09:02 PM   #10
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Grounding a metal house.


RX clamps, 1/2" ko's and connectors, whatever. It's still legal.

I think Maintenance is saying NM cable would not be legal. This is wrong.
As long as it is installed properly; grommets, etc, then it is perfectly legal. Not entirely desired, but legal.
I have done several jobs (working for others) with ALL metal studs and framing with NM cable. It's a real P-I-A but it is doable.
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Old 03-11-2008, 09:22 PM   #11
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Grounding a metal house.


Name:  250.104(C).jpg
Views: 202
Size:  53.2 KB

Here ya go.
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Old 03-11-2008, 09:28 PM   #12
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Grounding a metal house.


Quote:
I think Maintenance is saying NM cable would not be legal.
My mistake, I thought it was the boxes he was worried about.
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Old 03-11-2008, 09:37 PM   #13
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Grounding a metal house.


Quote:
Originally Posted by chris75 View Post
Attachment 2772

Here ya go.
See that. Even Mike Holt approves.
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Old 03-11-2008, 10:21 PM   #14
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Grounding a metal house.


Quote:
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See that. Even Mike Holt approves.
The NM was a bonus in that picture...
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Old 03-12-2008, 07:17 AM   #15
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Grounding a metal house.


I was thinking of the guy pulling romex directly through the metal studs and all that plastic sheathing getting sliced up. Sorry. I read more into it than was there.

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