Question

RMC is the wiring method used for the illustration below. The conduits are threaded wrench-tight into the entries in the bottom of the bell box. No additional support is required for this installation if the conduit length from the finish surface to the box is ____ inches or less.

a. 18
b. 12
c. 24
d. 36

Answer 1

The correct answer to the student's question is that no additional support is required for RMC installation if the conduit length from the finish surface to the box is 36 inches or less.

Step-by-step explanation:

The student's question refers to a specific installation scenario involving Rigid Metal Conduit (RMC), which is used in electrical wiring. RMC can be installed without additional support when the length of the conduit from the finish surface to the box is of a certain measurement. According to the National Electrical Code (NEC), no additional support is required if the conduit length is 36 inches or less. Conduit lengths exceeding 36 inches would require additional support to ensure a safe and compliant installation.