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Old 09-03-2013, 04:11 AM   #1
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Damp Wet Location, Is Romex or Metal boxes OK


For a roof or pavillion covering say a backyard patio similar to the photo, would under the roof be considered a wet or damp location?

Am I correct that either way it is not OK to use romex stapled to the trusses to supply power to lights and or a fan?

But it would be OK to use UF feeder cable?

Also would it be OK to use metal boxes on the trusses?


Last edited by collegetry; 10-27-2013 at 09:38 AM.
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Old 09-03-2013, 05:40 AM   #2
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Damp Wet Location, Is Romex or Metal boxes OK


I would pipe it in EMT

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Old 09-03-2013, 06:15 AM   #3
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Damp Wet Location, Is Romex or Metal boxes OK


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I would pipe it in EMT
why would you pipe in EMT and use individual conductors over using UF cable?
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Old 09-03-2013, 06:18 AM   #4
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Damp Wet Location, Is Romex or Metal boxes OK


I would use UF or PVC in both those out buildings.
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Old 09-03-2013, 07:00 AM   #5
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Damp Wet Location, Is Romex or Metal boxes OK


Metal boxes don't take long to start rusting when they are in a damp enviroment. The ones in my detached garage are starting to rust just from condensation that forms on them.
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Old 09-03-2013, 09:45 AM   #6
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Damp Wet Location, Is Romex or Metal boxes OK


I vote for PVC conduit.
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Last edited by hammerlane; 09-03-2013 at 09:47 AM.
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Old 09-09-2013, 01:01 PM   #7
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Damp Wet Location, Is Romex or Metal boxes OK


If I would want to hang a "ceiling" fan from an outdoor pavillion like hammer showed above, and metal boxes should not be used, what type of box would be used to hang a fan from the underside of the trusses?

Thanks
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Old 09-09-2013, 01:25 PM   #8
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Damp Wet Location, Is Romex or Metal boxes OK


Quote:
Originally Posted by collegetry View Post
If I would want to hang a "ceiling" fan from an outdoor pavillion like hammer showed above, and metal boxes should not be used, what type of box would be used to hang a fan from the underside of the trusses?

Thanks
Here's a good option:
http://www.gordonelectricsupply.com/...FSVBQgodji4Adg

I definitely second the other opinions that PVC is the way to go. It is easier to work with than EMT, doesn't corrode, and is cheaper.
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Old 09-09-2013, 01:30 PM   #9
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Damp Wet Location, Is Romex or Metal boxes OK


A saddle box? Did not know such a thing was made. Thanks
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Old 09-12-2013, 11:59 AM   #10
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Damp Wet Location, Is Romex or Metal boxes OK


You can use a metal box to hang the fan. Paint it with rust inhibotor paint if you are concerned. Be sure to properly ground the metal box though.
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Old 09-12-2013, 02:25 PM   #11
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Damp Wet Location, Is Romex or Metal boxes OK


back to the original question if this is a wet or damp location, it is somewhat open to interpretation. the nec includes examples in the damp location definition which include 'partially protected locations under canopies'. but what does that really mean? imagine a receptacle at grade with the canopy directly above it but right in line with the roof edge. pretty obvious that even the slightest breeze while raining will direct water onto the receptacle. location would now be considered wet. but it is under the canopy so can't it be considered damp? a little common sense applies here. i've always used the rule of drawing an imaginary 45 degree line from the canopy edge inward and under the sheltered area. areas above the line would be considered damp, areas below the line would be considered wet. no actual basis in the code for this but presents a common sense approach.

regarding the romex (nm-b) question, nm is not permitted in wet or damp locations. by definition, the area under an outdoor canopy is a damp location and thus, nm-b is not allowed. even in conduit it would not be allowed as the interior of an outdoor, above-grade conduit is a damp location.

nothing in the code explicitly prohibits using the metal boxes under the canopy.
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Old 09-13-2013, 06:51 AM   #12
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Damp Wet Location, Is Romex or Metal boxes OK


Post 11 has all your answers rolled into one.

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