Stevenfyeager
Senior Member
- Location
- United States, Indiana
- Occupation
- electrical contractor
For inside of office building, pvc 20 amp circuit, what is the minimum depth under concrete floor ? Thank you.
Hot box bender, blanket, heat gun, torch, there are many ways to make PVC bends.What about using liquidtight ? the GC is going to cut and his curves may not necessarily be fit for pvc curve fittings.
T300.5 would not apply to a trench cut into concrete for a raceway.
That section is titled "300.5 Underground Installations", the Table refers to raceways buried in the earth so it has nothing to do with a raceway within a concrete slab. The thread title says "PVC in concrete: min depth" there is no minimum.How do you figure it doesn't apply?
And if not, what did you base your 0" answer on?
Steve
The NEC chose the word underground because it's meaning is simple, just like the definition from the dictionary. It does not pertain to a raceway in concrete inside of an office building as outlined in the OP.Seems pretty vague to me. I'm not sure its considered not underground just because we are covering it with concrete instead of earth. It's still below ground, which could very well be what they meant by underground.
And if that table doesn't apply, then everything in concrete has a 0" minimum burial depth? That doesn't sound right.
Table 300.5 requires anything under a street to be 24" deep. But using the same logic, if table 300.5 doesn't apply, then I can just put anything I want right in the slab for the street with 0" depth? Again, doesn't sound right.
adverb: underground
/ˈəndərˌɡround/
- beneath the surface of the ground.
"miners working underground"
That's not what underground means.If an AHJ told me that "underground" means "below finish grade", and so 300.5 applies to a slab on grade, I would be hard pressed to definitively rebut that.
Cheers, Wayne