conduit in basement

[Kaizen]

Going to be running 2" conduit through my cellar wall and down below the existing dirt floor. Tried to call the inspector 3 times and not getting an answer so i'm turning to you guys. I know outside it has to be buried 18" but in a basement what are the requirements and good practices?
If there is no concrete does it also have to be 18"?
If it is under concrete is there a requirement for how much needs to be over it? I can't seem to find a requirement for this so if correct is there a good practice to keep it from cracking IF i'm only pouring 4x4 foot sections over the concrete? In other words if i do 3 inches and don't want it to crack over the 1" deep pipe should i have rebar opposite the run of conduit?
Getting my oil tank replaced and i have to pour a pad this week for the new one which will cover the garage proposed conduit.

 

[wyliesdiesels]

here ya go:

 

[Kaizen]

Thanks. Doesn’t look like any voltage has a requirement under a house? Does the 120v column cover 240v?


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[wyliesdiesels]

this table covers 0-600v.

column 4 is for 120v, 20a or less, GFCI protected circuits and does not apply to your situation since its 240v and assumedly for a branch feeder.

 

[Jim greengo]

I'd still bury it as deep as you can and lay caution tape in the ditch.
I've had to go out on plenty of commercial jobs in the past where somebody Jack hammered through a floor right into a piece of conduit not knowing it was there.

 

[Kaizen]

this table covers 0-600v.

column 4 is for 120v, 20a or less, GFCI protected circuits and does not apply to your situation since its 240v and assumedly for a branch feeder.

Got it column three covers this situation. Thanks I’d hate to do this, have the oil tank installed, and then have the absent inspector have an issue.


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[Kaizen]

I'd still bury it as deep as you can and lay caution tape in the ditch.

I've had to go out on plenty of commercial jobs in the past where somebody Jack hammered through a floor right into a piece of conduit not knowing it was there.

This will be four inches of concrete. The jackhammers I’ve used would blow right through a conduit a foot down before getting the pieces out to see the tape. Plus this is mostly sand and the more I dig the more I will have to dig. Thinking of running a tracer wire or tag on visible conduit saying it’s a straight run between the two visible parts.
This sand is also infused with forty years of coal dust so less moving the better. For all I know I have ledge two inches down


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