PVC conduit in concrete

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PAWayne

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Is PVC conduit imbedded in concrete, inside a manufacturing facility (running from indoor electrical rooms to operator panels on the floor) considered an underground installation requiring wire that is rated for wet locations?:confused:
 
Yes, if the concrete slab is in direct contact with the earth. (See the definition of Location, wet in Article 100)

Chris
 
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raider1 said:
Even if the slab is in direct contact with the earth?
Click to expand...

No...you got me on that one. :cool:

But I rarely if ever see a slab in direct contact with the earth.

Normally there will be a vapor barrier.
 
What type of non wet location wire do you have?
I can see a problem with fire alarm wire or similar but THHN is dual rated as THHW.
 
I'd think that even a conduit embedded in concrete that is not in contact with earth is still likely to develop water condensation, NEC aside.

Just out of curiosity, what kinds of wire would one want to use that would not have a W in the type? Are they really less expensive?
 
Wire Type

Wire Type

The wire that is being used is "Cable Type CC 600 CY". It's a PVC Jacketed Cable. It is twisted shielded pairs with an overall shield.

It's a German made cable, 12 conductors (6 pair). Name of manufacturer is SAB BROCKSKES.
 
Just did a web search on this particular cable.

The manfacturer states that all their cables are designed for use in dry, damp and wet locations.

Hope this helps.
steve
 
tom baker said:
What type of non wet location wire do you have?
I can see a problem with fire alarm wire or similar but THHN is dual rated as THHW.
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This makes me curious. How would a FA cable perform over time in a slab on the second floor of a climate controlled office building? Would condensatoin build up and compromise the cable as Larry suggests?
 
iwire said:
No...you got me on that one. :cool:

But I rarely if ever see a slab in direct contact with the earth.

Normally there will be a vapor barrier.
Click to expand...


How far up the side of the slab does the vapor barrier come in your part of the world? If not to grade level, it is in "direct contact with the earth" that is what makes the UFER ground required here in Florida and UF or THWN in conduit in the slab.
 
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