Journeyman Electrician Exam (NEC)Equipment and DevicesEasy
A technician is installing a new 120-volt, 60-watt incandescent luminaire in a dwelling unit. What is the minimum length of free conductor that must be left at each outlet, junction, and switch point for splices or the connection of luminaires or devices?
- A8 inches (200 mm)
- B4 inches (100 mm)
- C6 inches (150 mm)
- D12 inches (300 mm)
Show answer & explanationAnswer & explanation
Correct answer: C. 6 inches (150 mm)
According to NEC 300.14, at least 6 inches (150 mm) of free conductor, measured from the point in the box where it emerges from its raceway or cable sheath, must be left at each outlet, junction, and switch point for splices or the connection of luminaires or devices.
Why the other options are wrong
- A. This length exceeds the minimum requirement, though not incorrect to have more.
- B. This length is insufficient for proper termination and splicing.
- D. This length exceeds the minimum requirement, though not incorrect to have more.
Minimum Free Conductor Length
At least 6 inches (150 mm) of free conductor must be left at each outlet, junction, and switch point for splices or connection of luminaires or devices, measured from the point where the conductor emerges from the raceway or cable sheath.
- NEC 300.14 specifies this requirement.
- Minimum length is 6 inches (150 mm).
- Ensures adequate length for safe and proper termination and future maintenance.
Memory trick: Six inches of slack makes connections a snap.