Class I Div II

[bt1120]

I am currently working on new aircraft hangers and have ran into an issue. I have underground conduit that comes from the north end of the building to south end of the building outside in a non-classified area on both ends. Is it a requirement to have a seal off on both ends of the conduit? The conduits never actually enter the classified area.

 

[George Stolz]

See 513.8(B).

 

[bt1120]

All I have is my old 02 codebook with me. It doesn't have the 9(B) to 513. I will have to wait till tomorrow. Thanks

 

[George Stolz]

Here you go, from the 2005:

513.8 Underground Wiring.

(A) Wiring and Equipment Embedded, Under Slab, or
Under Ground. All wiring installed in or under the hangar
floor shall comply with the requirements for Class I, Division
1 locations. Where such wiring is located in vaults,
pits, or ducts, adequate drainage shall be provided.

(B) Uninterrupted Raceways, Embedded, Under Slab,
or Underground. Uninterrupted raceways that are embedded
in a hangar floor or buried beneath the hangar floor
shall be considered to be within the Class I location above
the floor, regardless of the point at which the raceway descends
below or rises above the floor.