230.6 Service Conductors Routed Through A Crawl Space

[steft007]

To an existing building, a fire pump is being added. In order to route the service conductors from the utility padmounted transformer to the fire pump controller, the conductors wll be routed underground from the transformer into the building crawl space (dirt floor, less than 24" head height). Once inside the crawl space, the conductors will be routed above grade to the fire pump controller inside the fire pump room. The first floor of the building has a poured concrete floor (which would be the ceiling of the crawl space) greater than 2 inches thick. Would the installation of the service conductors in the crawl space be "considered outside the building" since the conductors would be installed under not less than 2 inches of concrete?

 

[iwire]

To an existing building, a fire pump is being added. In order to route the service conductors from the utility padmounted transformer to the fire pump controller, the conductors wll be routed underground from the transformer into the building crawl space (dirt floor, less than 24" head height). Once inside the crawl space, the conductors will be routed above grade to the fire pump controller inside the fire pump room. The first floor of the building has a poured concrete floor (which would be the ceiling of the crawl space) greater than 2 inches thick. Would the installation of the service conductors in the crawl space be "considered outside the building" since the conductors would be installed under not less than 2 inches of concrete?

In my opinion, no per 230.6(2)

They requirement is encasement in 2" of concrete when in the building. In my opinion inside the crawl space is in the building.

That said the only opinion that counts is the AHJs.

230.6 Conductors Considered Outside the Building.
Conductors shall be considered outside of a building or
other structure under any of the following conditions:

(1) Where installed under not less than 50 mm (2 in.) of
concrete beneath a building or other structure

(2) Where installed within a building or other structure in a
raceway that is encased in concrete or brick not less
than 50 mm (2 in.) thick

(3) Where installed in any vault that meets the construction
requirements of Article 450, Part III

(4) Where installed in conduit and under not less than
450 mm (18 in.) of earth beneath a building or other
structure

 

[cowboyjwc]

I agree with Bob. Here the utility "might" let you do it if you run it in threaded ridgid conduit.