Q. When does the NEC consider service conductors as being installed outside of a building?
See the answer below.
This answer is based on the 2017 NEC.
A. Conductors are considered outside of a building when they’re installed [230.6]:
(1) Under not less than 2 in. of concrete beneath a building.
(2) Within a building within a raceway encased in not less than 2 in. of concrete or brick.
(3) In a vault that meets the construction requirements of Art. 450, Part III.
(4) In a raceway not less than 18 in. below a building.
(5) Within rigid or intermediate metal conduit that passes directly through an eave but not a wall of a building.
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