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Old 08-22-2012, 08:15 AM   #1
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Which type of wire do I use?


I will be building a small barn for my tractor storage & workshp area, no live stock except for me when I'm in there. I probably will not have any interior finished walls either. This will be a pole buildng.

I don't think Romex would be allowed. Next choice would be BX but I think tha'ts overkil and a corrosion problem as well.l. Now Im thinking UF or the other NMC(?) While the UF will be in the walls, it would meet the conditions in the building I think. I want to avoid use of conduit or Pvc or other shielding material, but want to be at code with the wire I do use. Building will be located in South Carolina, if that means anything. I just need a wire that will resist humid moist conditions. I think the UF would work fine for those conditions, surface mounted between the buildings posts.

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Old 08-22-2012, 08:27 AM   #2
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Which type of wire do I use?


It will really depend on the code and what your county inspector wants.

For my area, romex is fine so long as it is not an agricultural use barn.

If it was to have animals in it, then I had to use conduit and THNN wire.

My barn is wired up with ROMEX.
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Old 08-22-2012, 08:45 AM   #3
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Which type of wire do I use?


Quote:
Originally Posted by maddog1 View Post
I will be building a small barn for my tractor storage & workshp area, no live stock except for me when I'm in there. I probably will not have any interior finished walls either. This will be a pole buildng.

I don't think Romex would be allowed. Next choice would be BX but I think tha'ts overkil and a corrosion problem as well.l. Now Im thinking UF or the other NMC(?) While the UF will be in the walls, it would meet the conditions in the building I think. I want to avoid use of conduit or Pvc or other shielding material, but want to be at code with the wire I do use. Building will be located in South Carolina, if that means anything. I just need a wire that will resist humid moist conditions. I think the UF would work fine for those conditions, surface mounted between the buildings posts.

Thanks
Maddog1
Assuming your talking about the branch circuit wiring at the barn and shop.

You can either run a feeder to the pole building and install a sub-panel or you can run a branch circuit to the pole building...just depends on your needs. The wiring after that....personally I like a system of emt and the appropriate device boxes with thwn stranded wire.. I do not like romex exposed as it is to likely to be damaged or chewed on by critters.
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Old 08-22-2012, 09:07 AM   #4
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Which type of wire do I use?


Hi- The building will have its own 100 amp sub panel. Im more concerned with damp humid conditions. I know Romex is easier to work with but its not rated for the damp conditions but UF certainly is & it would work fine. Im not sure that code on the type of wire is an issue here because its a stand alone storage workshop barn with no livestock in it, except for maybe a field mouse now & then? I havent checked yet with the local building dept & what codes I need to be looking at. My son in law who works in construction in this county has said that all I will need is a building permit & file my drawings. He doubts they will even come out to inspect a small detached outbuilding standing in a 4 acre field of open grass.

maddog1

Thank you all for the advice.
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Old 08-22-2012, 09:14 AM   #5
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Which type of wire do I use?


Have you ever worked with UF? It's a lot more expensive than NM, and much harder to strip.

What makes you think NM isn't rated for damp conditions? It runs through unconditioned crawl spaces in lots of homes, which are probably as damp and humid as your building will be.
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Old 08-22-2012, 01:38 PM   #6
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Which type of wire do I use?


When did I say anything about NM? I mentioned Romex as one of the wires. Is that the same as NM. And yes, I've run UF before, and yes it is a chore & yes it is more expensive. Im not familiar with NM wire. I will have to look into that. I also mentioned NMC with a ? because I did not know if I had that one right. Also, I will be doing my own rough in so Im not concerned with how difficult UF is or time consuming. Im retired & have all the time my maker would like to give me
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Old 08-22-2012, 02:18 PM   #7
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Which type of wire do I use?


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When did I say anything about NM? I mentioned Romex as one of the wires. Is that the same as NM. And yes, I've run UF before, and yes it is a chore & yes it is more expensive. Im not familiar with NM wire. I will have to look into that. I also mentioned NMC with a ? because I did not know if I had that one right. Also, I will be doing my own rough in so Im not concerned with how difficult UF is or time consuming. Im retired & have all the time my maker would like to give me
http://homerenovations.about.com/od/...artromexnm.htm

NM = Romex.

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Old 08-22-2012, 02:37 PM   #8
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Which type of wire do I use?


OK- NM is romex! Understood. But I don't think its allowed to be used in damp conditions or buildings regarded as agricultural use. I think I need to use either the UF or the NMC(whatever that is). Thanks for the clarification on romex.
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Old 08-22-2012, 05:53 PM   #9
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Which type of wire do I use?


Depending on the code cycle you are under you could use regular old romex.

2011=yes
2008=no

You may have a "protection from physical damage" issue where you cross perpendicular to the studs. If you come down parallel, stapled to the studs you should be fine (assuming you are under 2011 NEC.

If this building is all metal, you will be required to use EMT or PVC.
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Old 08-22-2012, 07:09 PM   #10
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Which type of wire do I use?


I do not think you will find any nmc at HD or Lowes.
I don't think I have ever seen any before, but I know it is listed.
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Old 08-22-2012, 07:10 PM   #11
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Which type of wire do I use?


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Originally Posted by jbfan View Post
I do not think you will find any nmc at HD or Lowes.
I don't think I have ever seen any before, but I know it is listed.
Me either... I doubt it's cost effective over UF...
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Old 08-22-2012, 07:44 PM   #12
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Which type of wire do I use?


From the 2011 NEC. looks like damp areas are still out.

334.10 Uses Permitted. Type NM, Type NMC, and Type
NMS cables shall be permitted to be used in the following:
(1) One- and two-family dwellings and their attached or
detached garages, and their storage buildings.
(2) Multifamily dwellings permitted to be of Types III, IV,
and V construction except as prohibited in 334.12.
(3) Other structures permitted to be of Types III, IV, and V
construction except as prohibited in 334.12. Cables
shall be concealed within walls, floors, or ceilings that
provide a thermal barrier of material that has at least a
15-minute finish rating as identified in listings of firerated
assemblies.
Informational Note No. 1: Types of building construction
and occupancy classifications are defined in NFPA 220-
2009, Standard on Types of Building Construction, or the
applicable building code, or both.
Informational Note No. 2: See Informative Annex E for
determination of building types [NFPA 220, Table 3-1].
(4) Cable trays in structures permitted to be Types III, IV,
or V where the cables are identified for the use.
Informational Note: See 310.15(A)(3) for temperature
limitation of conductors.
(5) Types I and II construction where installed within raceways
permitted to be installed in Types I and II
construction.
(A) Type NM. Type NM cable shall be permitted as follows:
(1) For both exposed and concealed work in normally dry
locations except as prohibited in 334.10(3)

(2) To be installed or fished in air voids in masonry block
or tile walls
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Old 08-22-2012, 07:49 PM   #13
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Which type of wire do I use?


To me, this is no more than a detached garage.
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Old 08-22-2012, 08:09 PM   #14
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Which type of wire do I use?


I guess I was thinking about a pole type structure with a roof but no walls.
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Old 08-23-2012, 07:59 AM   #15
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Which type of wire do I use?


I do appreciate all the advice given here. But most everyone here is thinking residential applications. This is just a pole or post & frame small building of 18' x 24' feet. to house my compact JD tractor, and my workbench & tools. And the member who called it nothing more than a detached garage got it right in terms of what it is. I know for a fact that UF would cover any code issues. Yea, its expensive & a bummer to work with. But I don't have all that much to wire. Some lights, some outlets & two circuts to run 240V for my compressor & for my welder.

As far as buying supplies & Lowes or HD, forget about it. I tend to buy lumber from a lumber yard that deals with professional in the trade. I also buy my electrical supplies the same way, from a electrical supplier. I may be an amatuer DIY'er but I have found that with certain supples & product lines, the big box stores, carry nothing but low end every day junk. The building I'm going to build does not warrant me to go find the cheapest material around.

Thank you all
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