Todd Stickler
New member
- Location
- Mitchell South Dakota USA
501.10(A)(1)(a) Exception allows PVC underground in Class 1 Division 1 Location if encased in concrete and buried 2' deep
501.10(B)(1)(1) leaves the same rule in place for Class 1 Division 2
These two code sections would suggest that the boundary that declassifies these classified locations is not limited by depth of conduit
When can we use PVC without encasing in concrete under Class 1 locations?
511.3 for commercial garages says that the Class 1 location does not extend beyond solid partitions. It does not mention concrete floors, but are they implied?
Since 511 does not address underfloor conduits or wiring methods , I assume we refer back to 501. We have inspectors that go either way on commercial garages because the code is confusing ( not clear).
What is the intent? Can we use PVC under the floor in Commercial garages? Is there a depth limitation? Is there a concrete encasement requirement?
If the area under the floor is not classified ( which is not clarified by code?) , then we can penetrate the floor with a piece of GRC that extends without fittings to above the 18" (Classified level) without a requirement for seal offs. But if the area under the floor is classified, we need seal offs because we are entering the classified location? Are seal offs required for all floor penetrations in Commercial garages?
I believe the code needs some rewriting in 511?
I am clear that none of this is a question in 514 outside locations, but that code does not apply to 511 inside locations.
501.10(B)(1)(1) leaves the same rule in place for Class 1 Division 2
These two code sections would suggest that the boundary that declassifies these classified locations is not limited by depth of conduit
When can we use PVC without encasing in concrete under Class 1 locations?
511.3 for commercial garages says that the Class 1 location does not extend beyond solid partitions. It does not mention concrete floors, but are they implied?
Since 511 does not address underfloor conduits or wiring methods , I assume we refer back to 501. We have inspectors that go either way on commercial garages because the code is confusing ( not clear).
What is the intent? Can we use PVC under the floor in Commercial garages? Is there a depth limitation? Is there a concrete encasement requirement?
If the area under the floor is not classified ( which is not clarified by code?) , then we can penetrate the floor with a piece of GRC that extends without fittings to above the 18" (Classified level) without a requirement for seal offs. But if the area under the floor is classified, we need seal offs because we are entering the classified location? Are seal offs required for all floor penetrations in Commercial garages?
I believe the code needs some rewriting in 511?
I am clear that none of this is a question in 514 outside locations, but that code does not apply to 511 inside locations.