It is necessary to count luminaire (fixture) wires when counting the permitted number of conductors in a box according to 314.16.

• A. True
• B. False
• C. Not specified
• D. Sometimes

Answer: (B)

Box fill is about how much space the conductors inside a box need. The rule is to count each conductor that originates outside the box and terminates or is spliced inside the box, plus the grounding conductors as a single count and any internal clamps. The wires that belong to the luminaire itself are considered part of the device, not separate conductors filling the box. So you don’t add the luminaire’s own lead wires to the box-fill calculation; you count the supply conductors and any pigtails that splice inside the box, along with the grounding conductors and clamps if present. That’s why the statement is false.