A receptacles in a concrete slab box is considered a wet location. True or false?

[beachshadow]

True or false?

210.8(B) Other Than Dwelling Units.

All single-phase receptacles rated 150 volts to ground or less, 50 amperes or less and three-phase receptacles rated 150 volts to ground or less, 100 amperes or less installed in the following locations shall have ground-fault circuit-interrupter protection for personnel.

210.8(B)(6)

Indoor wet locations

Definitions:
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. (CMP-1)

 

[infinity]

False.

 

[Dennis Alwon]

If the concrete is not in contact with the earth and is indoor --False
If the box is outdoors- True
If the box is under a slab inside a building and is in contact with the earth -- true,
However, Inside the box would not be considered a wet location

 

[gadfly56]

If the concrete is not in contact with the earth and is indoor --False
If the box is outdoors- True
If the box is under a slab inside a building and is in contact with the earth -- true,
However, Inside the box would not be considered a wet location

OK, I'm intrigued. How does that go?

 

[infinity]

I don't see how the inside of the box has anything to do with required or not required GFCI protection.

 

[Rock86]

OK, I'm intrigued. How does that go?

I think it is the means of separation between contact with a wet location and dry. The floor in the room is dry location, but the box is in contact with a wet location. The wet location does not extend beyond the base of the flooring and nor the housing of the receptacle. I guess a silly way of explaining it would be putting a receptacle on a fish tank. the box inside the fish tank would be wet location, but the receptacle facing out in the room would not be. (that is a very very long stretch for an example hahaha)

 

[Dennis Alwon]

OK, I'm intrigued. How does that go?

Do you consider inside a panel to be wet location?

 

[LarryFine]

"Installations . . . in concrete slabs or masonry in direct contact with the earth;"

To me, this says that a slab on earth is a wet location, but a slab above earth is not.

Logically, the same rules that apply to conduit in concrete would apply here as well.

 

[infinity]

"Installations . . . in concrete slabs or masonry in direct contact with the earth;"

To me, this says that a slab on earth is a wet location, but a slab above earth is not.

Logically, the same rules that apply to conduit in concrete would apply here as well.

Larry where is that quoted section from raceways or boxes?

 

[gadfly56]

Do you consider inside a panel to be wet location?

If the panel is installed in the wall and not on it, it could very well be, if that wall is in contact with the earth.

 

[infinity]

I don't see how any of this in/out matters. The inside of a panel mount outside on a tree is still a dry location.

 

[Dennis Alwon]

If the panel is installed in the wall and not on it, it could very well be, if that wall is in contact with the earth.

So then the overcurrent protective device would have to be wet location. Have you ever seen them for a panel? LOL

 

[LarryFine]

Larry where is that quoted section from raceways or boxes?

Again, I'm thinking about the rules that apply to conductors in wet locations, and the definition of wet locations.

Wouldn't the inside of a box be exposed to the same environment as the inside of the conduit feeding that box?

 

[gadfly56]

So then the overcurrent protective device would have to be wet location. Have you ever seen them for a panel? LOL

How many panels have you seen installed flush in a concrete wall in contact with the earth? I'm going to guess zero.

 

[LarryFine]

How many panels have you seen installed flush in a concrete wall in contact with the earth? I'm going to guess zero.

I took a "slab" to mean one on a horizontal plane. Stucco could be (considered to be) concrete.

 

[gadfly56]

I took a "slab" to mean one on a horizontal plane. Stucco could be (considered to be) concrete.

Yes, well things got a little rotated during the discussion. If the box is mounted on the surface wouldn't that be different from in the concrete?

 

[LarryFine]

If the box is mounted on the surface wouldn't that be different from in the concrete?

Yes, different. Then it's about the environment of the space.

 

[Dennis Alwon]

Again, I'm thinking about the rules that apply to conductors in wet locations, and the definition of wet locations.

Wouldn't the inside of a box be exposed to the same environment as the inside of the conduit feeding that box?

No, because a box has weep holes to let the moisture/condensation out. A conduit in the ground will usually have the conductors sitting in water

 

[infinity]

What code section would state that the inside of a box is a wet location? There is specific wording regarding raceways but nothing about boxes. If I have a box in a slab in contact with the earth fed by MC cable embedded in the concrete is that box interior somehow a wet location?

 

[Fred B]

What code section would state that the inside of a box is a wet location? There is specific wording regarding raceways but nothing about boxes. If I have a box in a slab in contact with the earth fed by MC cable embedded in the concrete is that box interior somehow a wet location?

In a round about way implied. It does reference a means to prevent accumulation of moisture can be field installed 314.15, (ie. drill a weep hole) implying interior may be at least a damp location. Same method suggested for conduit bodies.