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Old 01-20-2018, 08:27 AM   #1
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Default Wet location?

Is underslab conduit within the confines of a structure considered a wet location?
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Old 01-20-2018, 09:09 AM   #2
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I'd ask the AHJ, have had conflicting thoughts on this before.
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Old 01-20-2018, 09:18 AM   #3
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It will get water in it, I would plan on that.
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Old 01-20-2018, 10:04 AM   #4
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Quote:
Originally Posted by brichter View Post
Is underslab conduit within the confines of a structure considered a wet location?
You must have got busted pulling NM to an island in a kitchen, right? I haven't done that in the two months since I got busted..
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Old 01-20-2018, 11:49 AM   #5
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Quote:
Originally Posted by Stickshaker View Post
You must have got busted pulling NM to an island in a kitchen, right? I haven't done that in the two months since I got busted..
Never got busted but the company I once worked for did it many times.
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Old 01-20-2018, 12:55 PM   #6
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I was informed by a code instructor, that I consider very knowledgeable, that anything in the dirt is considered a damp location. Think condensation.


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Old 01-20-2018, 01:08 PM   #7
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Oh yes, there is water down there you know...........

https://www.newscientist.com/article...o-earths-core/
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Old 01-20-2018, 02:02 PM   #8
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Just the simple definition of a wet location in Art. 100 says that under slab conduit is indeed wet.

Location, Wet. Installations underground or in concrete slabs or masonry in direct contact with the earth
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Old 01-20-2018, 02:03 PM   #9
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Yes.
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Old 01-20-2018, 06:30 PM   #10
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I've seen thhn in conduit under a slab and when I reported to to my supervisor it was only a problem/changed out about 50% of the time.
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Old 01-20-2018, 06:44 PM   #11
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As long as the slab makes contact with the earth the raceway is in a wet location
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Old 01-20-2018, 06:46 PM   #12
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I should have posted the code. It is in definitions

Quote:
Location, Wet. Installations underground or in concrete slabs
or masonry in direct contact with the earth; in locations subject
to saturation with water or other liquids, such as vehicle washing
areas; and in unprotected locations exposed to weather.
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Old 01-20-2018, 09:46 PM   #13
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Quote:
Originally Posted by brichter View Post
Is underslab conduit within the confines of a structure considered a wet location?
99.9% of time yuh it will be wet location due the moisture in ground.
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Old 01-20-2018, 11:45 PM   #14
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Dennis nailed it.
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Old 01-21-2018, 09:23 AM   #15
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I've never seen any insulation marked only THHN. Was there such a thing not some form of dual rated insulation? I've probably not been around this long enough to have seen it.
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Old 01-21-2018, 09:55 AM   #16
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Quote:
Originally Posted by nrp3 View Post
I've never seen any insulation marked only THHN. Was there such a thing not some form of dual rated insulation? I've probably not been around this long enough to have seen it.
I have see it before with straight THHN but that is getting super rare nowdays due they are allready rated THHN/THWN now.

I just saw one straight THHN few months back on one of commercal location.
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