Buried Rigid vs PVC

[petersonra]

I'm glad concrete covered pvc is allowed for gas stations. I wish it was allowed for more situations

You can use concrete covered PVC anywhere you can use PVC.

 

[letgomywago]

You can use concrete covered PVC anywhere you can use PVC.

But not everywhere that rigid is required for hazardous locations

 

[TwoBlocked]

But not everywhere that rigid is required for hazardous locations

Well, there's a point. We will be coming up near the wells themselves. Typically If you are within 5 feet of a vent or pressure relief valve, you are in Class I, Div I. So if we come up within the classified area, transitioning from buried PVC to above ground rigid with a seal before entering the J-box, We are still compliant, right?

 

[don_resqcapt19]

Well, there's a point. We will be coming up near the wells themselves. Typically If you are within 5 feet of a vent or pressure relief valve, you are in Class I, Div I. So if we come up within the classified area, transitioning from buried PVC to above ground rigid with a seal before entering the J-box, We are still compliant, right?

I think the only place the code actually addresses this is in 514.8(C) in the 2023 code, in the 2107 it is addressed in Exception #2 to 514.8. However the scope of Article 514 is motor fuel dispensing facilities, and this rule does not apply to other types of hazardous location installations.

 

[rbalex]

I'm glad concrete covered pvc is allowed for gas stations. I wish it was allowed for more situations

Concrete encased PVC, HDPE, and RTRC with a few additional installation requirements has been permitted in Class I, Division 1 (and 2) for several Code cycles. See 2023 NEC, Sections 501.10(A)(1)(2) and (B)(2).

 

[don_resqcapt19]

Concrete encased PVC, HDPE, and RTRC with a few additional installation requirements has been permitted in Class I, Division 1 (and 2) for several Code cycles. See 2023 NEC, Sections 501.10(A)(1)(2) and (B)(2).

I guess I need to look before posting..been in the code since at least the 1999 code for an underground installation.

 

[TwoBlocked]

I think the only place the code actually addresses this is in 514.8(C) in the 2023 code, in the 2107 it is addressed in Exception #2 to 514.8. However the scope of Article 514 is motor fuel dispensing facilities, and this rule does not apply to other types of hazardous location installations.

Hmmm, considering natural gas is lighter than air, and the PVC is buried, a seal at the end of the rigid coming out of the ground should be fine.

 

[kwired]

Concrete encased PVC, HDPE, and RTRC with a few additional installation requirements has been permitted in Class I, Division 1 (and 2) for several Code cycles. See 2023 NEC, Sections 501.10(A)(1)(2) and (B)(2).

Was it allowed to use PVC without concrete encasement in other than motor fuel dispensing facilities at one time? I remember doing this several years ago and one of the more particular inspectors never said anything about it, and I probably looked it up and figured it was ok at the time as well or I wouldn't have done it. It was a circuit running to a bulk propane dispensing station where delivery trucks came to refill basically. Probably would have been 2002 or 2005 NEC that would have applied at that time. Emerged with RMC but underground was PVC 24" or more deep.