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Old 01-01-2014, 01:26 PM   #1
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New Pole frame building. NMC vs EMT?


Hi folks.
Great looking site! Have really been enjoying reading all the good info here, and also at the Pro site. I appreciate the time spent by the Pros in giving assistance to others.

Putting up a new Pole shed, 42 x 72. Am trying to decide whether to bury a bunch of NMC under the drywall, or to run EMT along the wall's surface. I am very capable of doing either.

The shed will be used for being creative. A compressor (220v) that I'll have close to the 200 amp panel. A couple of 220v welders that will be located about midway down the 72' wall. A couple of table saws (110v) And several 110v circuits for receptacles.
In running the NMC, it would make any changes more difficult. Plus, rather than drilling holes through the posts and the 2x6's for the cable, can you put them between the exterior steel panels and the posts? To me that would be a potential problem if someone were to drive a screw into the wall from the outside, right into a conductor. Or am I being over cautious? Also, there will be either 1/2" or 1" (haven't decided yet) rigid foam under the drywall, so that would make mounting the boxes a little more interesting.
It just seems to make more sense, the more I think about it, to pull wires thru pipes.
I guess I just need a little "push" one way or the other.

Thanks in advance for any input!

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Old 01-01-2014, 01:41 PM   #2
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New Pole frame building. NMC vs EMT?


I would opt for the surface mounted pipe. But I would use PVC instead of EMT.

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Old 01-01-2014, 01:44 PM   #3
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New Pole frame building. NMC vs EMT?


The conduit is more flexible should the needs change. You might want some 3/4 in some places. You could run the cables in the ceiling and branch off to the conduits.

I would run purlins between the posts to mount the boxes on.
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Old 01-01-2014, 01:46 PM   #4
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New Pole frame building. NMC vs EMT?


I also vote for PVC conduit. Durable, multi-purpose, easy to work with, and corrosion proof.
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Old 01-01-2014, 01:55 PM   #5
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New Pole frame building. NMC vs EMT?


I think I would lean towards the surface mount conduit. It would make it easier to make changes in the future if you move some of the machinery, receptacles, etc. It would also fit the industrial decor if that matters to you although my vote would be for emt vs pvc. PVC needs expansion joints and even then it can tend to sag over time.
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Old 01-01-2014, 01:57 PM   #6
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New Pole frame building. NMC vs EMT?


The conduit could also be run behind the drywall.
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Old 01-01-2014, 02:13 PM   #7
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New Pole frame building. NMC vs EMT?


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The conduit is more flexible should the needs change. You might want some 3/4 in some places. You could run the cables in the ceiling and branch off to the conduits.

I would run purlins between the posts to mount the boxes on.
Dropping circuits down from the 14' ceiling would burn up a lot of cable, wouldn't it?
They'll be 2x6's 16" on center between the posts. You need that for the drywall.
Thanks!
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Old 01-01-2014, 02:19 PM   #8
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New Pole frame building. NMC vs EMT?


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The conduit could also be run behind the drywall.
That would make things a little more flexible than having Romex back there, wouldn't it. As far as adding wire goes anyway. But how would you add a box afterwards if not making a run on the surface?
Also, that sure would be a lot of drilling. I know that you guys on the Pro board have beat that one to death.
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Old 01-01-2014, 02:25 PM   #9
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New Pole frame building. NMC vs EMT?


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I think I would lean towards the surface mount conduit. It would make it easier to make changes in the future if you move some of the machinery, receptacles, etc. It would also fit the industrial decor if that matters to you although my vote would be for emt vs pvc. PVC needs expansion joints and even then it can tend to sag over time.
If doing it on the surface, I would prefer EMT over PVC also. Yea, I know, PVC is tons quicker. But I only want to do this once. I would think that the metal pipe would offer more protection from "boo boos", plus there is the expansion/contraction thing. At times, the area won't be heated, and others it will. And don't you have to support the plastic more?
Thanks!
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Old 01-01-2014, 02:30 PM   #10
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New Pole frame building. NMC vs EMT?


Quote:
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If doing it on the surface, I would prefer EMT over PVC also. Yea, I know, PVC is tons quicker. But I only want to do this once. I would think that the metal pipe would offer more protection from "boo boos", plus there is the expansion/contraction thing. At times, the area won't be heated, and others it will. And don't you have to support the plastic more?
Thanks!
If the building is not heated, I would be concerned about using conventional drywall. I would consider plywood or at a minimum paperless drywall.
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Old 01-01-2014, 03:29 PM   #11
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If the building is not heated, I would be concerned about using conventional drywall. I would consider plywood or at a minimum paperless drywall.
It will be super insulated, and it won't be allowed to get THAT cold.
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Old 01-01-2014, 04:00 PM   #12
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New Pole frame building. NMC vs EMT?


I would have an electrician bid it .
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Old 01-01-2014, 05:21 PM   #13
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New Pole frame building. NMC vs EMT?


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I would have an electrician bid it .
No Bob,,,,,,,, I'll be doing it myself.
Not trying to sound like a Pro electrician, because I'm certainly not. But this also isn't my first rodeo.
Have been pulling my own wire since I've been 16. (43 years ago, uffda!) And follow NEC. Have been inspected. I enjoy doing it.

It breaks the monotony of repairing automatic transmissions for the past 40 years.
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Old 01-03-2014, 12:44 PM   #14
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New Pole frame building. NMC vs EMT?


Quote:
Originally Posted by Dragfluid View Post
Yea, I know, PVC is tons quicker.
FWIW, I'm not sure if I agree with that.

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