The minimum concrete cover required for a conduit carrying service entrance conductors under a building to be considered outside is measured in inches and equals 2 inches.

• A. 2 in.
• B. 6 in.
• C. 12 in.
• D. 18 in.

Answer: (A)

When a conduit carrying service entrance conductors is embedded in concrete under a building, the concrete itself provides the protective cover. The NEC sets a minimum concrete cover of two inches to ensure the conduit is protected while still allowing the concrete to serve as the shielding. The other depths are relevant to installations buried in soil or in different conditions, not to conduit encased in concrete under a structure. So the minimum concrete cover is two inches.