A 120/240-volt, 3 wire service drop passing over a pedestrain sidewalk shall hav

Question

A 120/240-volt, 3 wire service drop passing over a pedestrain sidewalk shall have a minimum clearance from final grade of how many ft? 10 ft (3.05m) 12 ft (3.66m) 15 ft (4.57m) 18 ft (5.49m) NEC: The minimum number of in. between the top surface of a finished grade and the top of a direct burial cable that is in a trench that is beneath a 3 in. (76.2mm) thick concrete slab is: 6 in. (152.4mm) 12 in. (305mm) 18 in. (457mm) 24 in. (610mm) NEC: Determine the minimum cubic in. required for three 12 AWG TW conductors passing through a box, five 14 AWG THHN conductors terminating in the box, two 10 AWG TW conductors terminating to a receptacle, and one 10 AWG equipment bonding jumper from the receptacle to the box. 12.00 in.^3 (196.8 cm^3) 14.25 in.^3 (233.7 cm^3) 16.75 in.^3 (274.7 cm^3) 29.25 in.^3 (315.7 cm^3) NEC:

Explanation / Answer

4. A) 12 ft (3.66 m)

— over residential property and driveways, and those commercial areas not subject to truck traffic where the voltage does not exceed 300 volts to ground  

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