Journeyman Electrician Exam (NEC)Wiring Methods and MaterialsHard
A technician is connecting a new light fixture to an existing junction box. The light fixture has an integral junction box. According to NEC 314.16(A), when calculating the minimum box volume, how many conductor equivalents must be counted for a luminaire (lighting fixture) that has an integral junction box, and has no splices or connections other than to the conductors supplying the luminaire?
- A2
- B1
- C0
- D3
Show answer & explanationAnswer & explanation
Correct answer: C. 0
NEC 314.16(A) Exception No. 2 states that where a luminaire (lighting fixture) or lampholder has an integral junction box that complies with the requirements of Article 314, and there are no splices or connections other than to the conductors supplying the luminaire or lampholder, then no conductor or equipment counts are required for the box.
Why the other options are wrong
- A. Incorrect. This would be for a typical scenario with luminaire wires counted, but not for this specific exception.
- B. Incorrect. This would apply if it were a single internal clamp, but not for the integral box itself under the exception.
- D. Incorrect. This is too high and does not apply to the exception.
Box Volume Count Exception
The NEC provides exceptions to standard box volume calculations, such as for integral junction boxes in luminaires where no additional splices or connections are made.
- NEC 314.16(A) outlines general box fill calculations.
- Exception No. 2 specifically addresses luminaires with integral junction boxes.
- This exception simplifies calculations when the integral box serves only as a connection point for the fixture's supply conductors.
Memory trick: No extra wires, no extra count, for the light fixture's mount!