Conduit under slab depth

[Maxxy41]

Hey does anyone know the depth required for conduit under a concrete slab.

I ran some ducts under my garage floor for future use before it was poured. 3” pvc, few inches deep. Concrete is poured 4” thick over top. So I’d say they’re about 8” from the surface. Since the concrete is poured and the pipe’s depth can’t be inspected visually, would an inspector have a problem with not seeing their actual depth with his own eyes during a “trench inspection”

I’ve read 18” for conduit and 24” for direct bury but i can’t find a direct answer for under concrete.

I’d like to use one of them to move my meter to the opposite side of my garage

Location - NJ

 

[LarryFine]

With the height of 3" elbows known, the depth should be obvious.

 

[Maxxy41]

With the height of 3" elbows known, the depth should be obvious.

Good point. I just need to figure out the required depth before I waste the inspectors time

 

[nizak]

Good point. I just need to figure out the required depth before I waste the inspectors time

If concrete is already poured what’s left to figure?

 

[Maxxy41]

If concrete is already poured what’s left to figure?

If it is deep enough to use and pass inspection

 

[kwired]

I’d like to use one of them to move my meter to the opposite side of my garage

Might want to make sure your POCO is ok with doing that.

 

[infinity]

Look at 300.5 for under a building.

 

[Dennis Alwon]

If it is deep enough to use and pass inspection

If you have 4" of concrete above the PVC you should be fine. That is my answer without checking the table. I gtg...

 

[infinity]

Under a building is 0". In a slab is just deep enough to cover the raceway and that's not even a requirement.

 

[Maxxy41]

Might want to make sure your POCO is ok with doing that.

I talked to them before. They have a few requirements like access and height and in my case 3 feet away from vehicular pathways

 

[Maxxy41]

Look at 300.5 for under a building.

Awesome thank you. I’m reading under a building is 0 for non metal. As long as he doesn’t need to have seen it I should be good.

 

[Maxxy41]

If you have 4" of concrete above the PVC you should be fine. That is my answer without checking the table. I gtg...

Thanks. Just checked the table. I think im good

 

[Maxxy41]

Under a building is 0". In a slab is just deep enough to cover the raceway and that's not even a requirement.

Awesome thanks again. Mine being under the slab i should have no problems.

 

[kwired]

I talked to them before. They have a few requirements like access and height and in my case 3 feet away from vehicular pathways

Some won't like the service lateral to be inside perimeter of the building is what I was getting at. Especially if the "service point" is at your meter equipment. It you technically own and maintain what is under the building they likely won't care. If they maintain it they likely want it outside the building in most cases.