Al Pike
Member
- Location
- Honesdale, Pa
I've seen lift stations with conduit seals installed at the boundary of a C1D1 area and lift stations without seals using a 24in air gap before connecting to a enclosure. I'm thinking the C1D1 ends at the conduit leaving the station boundary(grade) and the air gap creates a unclassified area outside of 24in.
My question is where does the documentation allowing for a air gap come from and what authority allows this type of installation in place of NEC requirements for seal placement in classified areas. I've seen jobs engineered both ways but only have the NEC to reference on my responsibilities as a contractor.
Any thoughts would be appreciated. Thanks
My question is where does the documentation allowing for a air gap come from and what authority allows this type of installation in place of NEC requirements for seal placement in classified areas. I've seen jobs engineered both ways but only have the NEC to reference on my responsibilities as a contractor.
Any thoughts would be appreciated. Thanks