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Monday, September 28, 1998
Question:
Which of the following meet the requirements for service conductors to be considered to be outside of a building?
A Install the conduit in the crawl space.
B Install the feeder under the garage floor.
C Install the service conduit under a hand lain, brick floor.
D Install the feeder under not less than 2 inches of concrete beneath the building.
A
Answer:
The answer is B ... uh well ... let's see ... maybe it is C ... or maybe D ... HMMM ... let's take a look at section 230-6. Conductors will be considered to be outside of a building where installed under not less than 2 in. of concrete beneath a building (that's D and probably B), where installed inside a building in a raceway that is encased in brick not less than 2 in. thick (that's C if you would consider them encased, I would count the floor the same as a concrete if the joints were mortared.) This, like a lot of things in the National Electrical Code is not cut and dried, you have to use common sense and work with the various people involved with a project plus the AHJ to find an acceptable solution.