Journeyman Electrician Exam (NEC)Wiring Methods and MaterialsMedium
A commercial electrician is installing a new 20-amp, 120-volt branch circuit in a suspended ceiling. The circuit will use Type MC cable. What is the maximum distance the MC cable can be supported from a box or fitting where it terminates?
- A24 inches
- B18 inches
- C6 inches
- D12 inches
Show answer & explanationAnswer & explanation
Correct answer: D. 12 inches
NEC Section 330.30(C) specifies the support requirements for Type MC cable. It states that the cable must be secured within 12 inches of every box, cabinet, or fitting to which it is connected.
Why the other options are wrong
- A. This greatly exceeds the maximum allowed distance.
- B. This exceeds the maximum allowed distance.
- C. This is less than the maximum allowed distance.
MC Cable Support at Terminations
The NEC-mandated maximum distance from a box or fitting where Type MC cable must be secured.
- Prevents strain on connections.
- Ensures cable stability.
- Applies to all terminations of MC cable.
Memory trick: Twelve inches close, to keep MC cable composed.