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Romex outside #188216
07/25/09 01:00 PM
07/25/09 01:00 PM
S
sparkync  Offline OP
Member
Joined: Oct 2002
Posts: 830
NC
I've got a picnic shelter I'm giving a price on that will include lighting and a few receptacles. The wiring will not be exposed to the direct weather but will be exposed to humidity. Can regular romex be used or do I need to use UF cable ?? thanks..

2017 / 2014 NEC & Related Books and Study Guides
Re: Romex outside [Re: sparkync] #188217
07/25/09 01:43 PM
07/25/09 01:43 PM
G
George Little  Offline
Member
Joined: Jan 2004
Posts: 1,489
Michigan USA
Judgment call for sure. The '08 NEC has some new wording in 334.14(B)(4) that might apply since the code prohibits installation in damp locations. More than likely most most inspectors would buy it.

As a side note can anyone show me where the conductors in NM cable are identified as THHN?

334.14(B)(4)



George Little
Re: Romex outside [Re: George Little] #188220
07/25/09 03:48 PM
07/25/09 03:48 PM
G
gfretwell  Offline

Member
Joined: Jul 2004
Posts: 9,302
Estero,Fl,usa
I don't think NM-B has ever been allowed in damp locations.

I always believed it was because of the kraft paper packing that will wick up water.
The only question for the AHJ is how damp is that location?

Quote
Location, Damp. Locations protected from weather and not subject to saturation with water or other liquids but subject to moderate degrees of moisture. Examples of such locations include partially protected locations under canopies, marquees, roofed open porches, and like locations...


Greg Fretwell
Re: Romex outside [Re: sparkync] #188221
07/25/09 03:51 PM
07/25/09 03:51 PM
S
sparkync  Offline OP
Member
Joined: Oct 2002
Posts: 830
NC
Also since the outlets will be under the shelter on the inside of the post, will I need to use in use covers or just regular weatherproof outlet covers? Thanks.

Re: Romex outside [Re: gfretwell] #188222
07/25/09 03:55 PM
07/25/09 03:55 PM
G
gfretwell  Offline

Member
Joined: Jul 2004
Posts: 9,302
Estero,Fl,usa
They are not "THHN" they are just a 90c rated conductor of some kind, since that is all the listing commits to.

As a practical thing we might assume they are THHN, just because of manufacturing expediency but we can't prove it.
For that matter you might even assume they are THHN/THWN but you know what assume means.

Who would have thought the covers on NM conduit bodies and the straps for RNC were not made out of the same plastic as the raceway but I had a Carlon rep tell me they don't have to be (in the listing) and in fact, at the time they were not UV protected. I don't know if they ever fixed that.


Greg Fretwell
Re: Romex outside [Re: gfretwell] #188223
07/25/09 03:58 PM
07/25/09 03:58 PM
G
gfretwell  Offline

Member
Joined: Jul 2004
Posts: 9,302
Estero,Fl,usa
I think snap covers would be appropriate.


Greg Fretwell
Re: Romex outside [Re: sparkync] #188231
07/26/09 01:50 PM
07/26/09 01:50 PM
Niko  Offline
Member
Joined: Aug 2006
Posts: 356
Campbell, CA
from the southwire PDF for the romex product.

APPLICATIONS
Southwire's Romex SIMpull Type NM-B (nonmetallic-sheathed cable) may be used for both exposed and concealed work in normally dry locations at temperatures not to exceed 90C (with ampacity limited to that for 60C conductors) as specified in the National Electrical Code 1 . NM-B cable is primarily used in residential wiring as branch circuits for outlets, switches, andvother loads. NM-B cable may be run in air voids of masonry block or tile walls where such walls are not wet or damp locations. Voltage rating for NM-B cable is 600 volts.


Be kind to your neighbor, he knows where you live

Re: Romex outside [Re: Niko] #188242
07/26/09 11:16 PM
07/26/09 11:16 PM
J
jdot77  Offline
Member
Joined: Mar 2007
Posts: 16
Riverview, Fl
I would say no to romex in that location because it would be considered damp. Also your are in a damp location for the cover as well not a wet location subject to pounding rain so a flip up wheater proof cover should be fine.


jason
Re: Romex outside [Re: jdot77] #188257
07/27/09 05:38 PM
07/27/09 05:38 PM
K
KJay  Offline
Member
Joined: Nov 2007
Posts: 763
MA, USA
If it were me, I would spec Type UF, but with work being as tight as it is these days, maybe check with the local inspector so you don't price yourself out of the job if somebody else is bidding it in NM and knows for sure the inspector will allow it.
As they say... when in Rome...

Re: Romex outside [Re: KJay] #188262
07/27/09 08:33 PM
07/27/09 08:33 PM
G
gfretwell  Offline

Member
Joined: Jul 2004
Posts: 9,302
Estero,Fl,usa
Quote
As they say... when in Rome...


... use Romex?


Greg Fretwell
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