conduit installed in slab

[rcfoolinca]

Hi all. I have run into a design/installation issue with an electrical inspector. In a nutshell, a branch circuit conduit is embedded in the concrete floor on the ground level of a two story building. Electrical contractor called for an inspection prior to covering the conduit with concrete and the inspector red tagged it citing section 300.5/table 300.5. When I called the inspector to discuss, Inspector said per his interpretation, the code doesn't allow such a scenario and wants to installed the conduit in the ground under the slab. I've told the inspector that section 300.5 is only applicable for conduits buried underground and our scenario isn't it at all. He remains adamant. Just want to get the group's thought if you have ever run into this situation.

 

[infinity]

The inspector is incorrect. T300.5 is for conduits buried in the ground not embedded in concrete. In the concrete it only needs to below the surface.

 

[Malywr]

The inspector is incorrect. T300.5 is for conduits buried in the ground not embedded in concrete. In the concrete it only needs to below the surface.

Question so if it is in concrete under building conditions needs to be just deep enough to be covered like 0.5”? I taught conduit should be in ground 6” below top of concrete?


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[don_resqcapt19]

Table 300.5 clearly shows the required depth to be zero under a building ...flush with the top of the slab would be code compliant.

 

[LarryFine]

Remember that the cable/conductors must still be W-rated.

 

[electrofelon]

Just want to get the group's thought if you have ever run into this situation.

No, and apparently the guys who wire up high rises haven't either

 

[roger]

No, and apparently the guys who wire up high rises haven't either

Exactly. I have installed miles of conduit imbedded in high rise slabs and decks.

Roger

 

[infinity]

Exactly. I have installed miles of conduit imbedded in high rise slabs and decks.

Roger

Same here, pretty hard to have T300.5 burial depths in 4" of concrete.

 

[rcfoolinca]

Thank you all, just as I thought. However, I do have a hard time telling this inspector that the NEC doesn't govern conduits embedded in concrete. His "interpretation" is that the conduits HAVE to be underslab. Huh?

 

[infinity]

Does this inspector have a boss? This one is clear as day and he's just wrong.

 

[roger]

Does this inspector have a boss? This one is clear as day and he's just wrong.

X2

Roger