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#194674 06/16/10 12:09 AM
Joined: Feb 2002
Posts: 2,233
H
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I just got ask another couple of questions. This time about damp location sec 334.12(B)(4) states that you can't use NM wire in a damp location. So this EC calls me up and asks if he can use NM above a ceiling of an unheated garage which will not be insulated but it will have a roof over it. I ask him if he feels it will be a damp location and he said no. Does anyone else have a feeling about this location?

2ND question, he said that other AHJ's told him that if he uses a receptacle for a dishwasher and it is installed under the sink, it has to be GFI protection because that area is also considered a "damp" location.

Any thoughts on this one?

2017 / 2014 NEC & Related Books and Study Guides
Joined: Aug 2001
Posts: 459
J
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I am still trying to get a handle on what would be considered a damp location with this change. Does this mean I can no longer run NM thru the floor joists above a crawlspace?

As far as the cabnet being a damp area I don't see it that way. If it were damp i think the source of the leak needs to be found.

Joined: Aug 2001
Posts: 459
J
Member
I am still trying to get a handle on what would be considered a damp location with this change. Does this mean I can no longer run NM thru the floor joists above a crawlspace?

As far as the cabnet being a damp area I don't see it that way. If it were damp i think the source of the leak needs to be found.

Joined: Aug 2007
Posts: 853
L
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1) No way. The area is completely protected from the elements.

2) If you get that much water under a sink..... You need a plumber.

In fairness for #2- Is this a commercial or residential setting? Is it an open vanity or enclosed in a cabinet?

leland #194682 06/16/10 12:32 AM
Joined: Feb 2002
Posts: 2,233
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Jim,

I can see a crawl space with no floor as being a "damp" location. As for a crawl space that has a concrete floor would that be considered "Damp"?

Joined: Feb 2002
Posts: 2,233
H
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Leland,

I agree with you, if under the sink is "Damp" then a plumber is needed! smile The cabinet in question was a normal kitchen household sink closed cabinet. The EC who asked me about "Damp" locations tells me today that he was failed on a job, because the Dishwasher recpt. needed to be GFI because the AHJ considered it a damp location.

Go figure that one out!

Joined: Aug 2007
Posts: 853
L
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Originally Posted by harold endean
Leland,

I agree with you, if under the sink is "Damp" then a plumber is needed! smile The cabinet in question was a normal kitchen household sink closed cabinet. The EC who asked me about "Damp" locations tells me today that he was failed on a job, because the Dishwasher recpt. needed to be GFI because the AHJ considered it a damp location.

Go figure that one out!


No need to.

Ask for the art.# with substantiation/definition.

for a $13 item,typically I won't tussle, But add them up. Now you are talking principal and overhead.

I'm sure you know the type: 'I'll push- and when I get resistance- (knowledgeable)- I know what I'm dealing with.'

Kind of an inspectors way of finding who they have to watch,and not.

Years ago, I used to cave, Then when I grew confident and knew how to read...

Those folks aren't so scary. wink

Joined: Jul 2004
Posts: 9,662
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G
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If your crawl space or basement is that "damp" I would be more concerned about black mold than damage to the RX.

If this is a commercial kitchen I would seriously consider it "wet".
I never thought about it until my wife started running a country club with 2 kitchens. They hose that place down every night with steaming hot water. All the appliances and work tables are on wheels so they can pull them out and hose behind them.
That is the thinking behind the universal requirement for GFCIs in kitchens I suppose.
If I was designing one from scratch I would use waterproof plugs like Russell Stoll or IEC309 hanging on SO cord.


Greg Fretwell
gfretwell #194706 06/16/10 03:58 PM
Joined: Jun 2006
Posts: 613
M
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Damp is where condensation is likely to form. No place inside of a residential structure should be damp except maybe areas associated with swimming pools or steam rooms.
If the crawl space is damp I would recommend added ventilation and or a heater set high enough to prevent condensation and mold.
The area under a kitchen counter is dry except under abnormal conditions. Abnormal conditions require a plumbing or appliance repair and is not what you wire for.
The commercial kitchen described is a wet location if it gets washed down.

mikesh #194712 06/16/10 06:38 PM
Joined: Nov 2007
Posts: 763
K
Member
Around here, we have used NM cable exposed in unfinished resi garages, crawl spaces and basements for many decades with no raft of life threatening incidents, so I donít know why it has turned into such a big deal over nothing for the NEC, at least for the last couple of code cycles anyway.

As far as the GFCI under the sink for the receptacle for a dishwasher, in residential, if thatís a damp location, then Iím Brad Pitt. smile

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