Which of the following statements is true regarding equipment supplying an individual dwelling unit in a two-family dwelling?

• A. It may supply public area lighting circuits
• B. It cannot supply public area lighting circuits
• C. It must be on a dedicated 60 A feeder
• D. It can supply public areas only if on weekends

Answer: (B)

The key point is that the equipment feeding an individual dwelling unit in a two‑family building is intended to serve only that unit. Public area lighting—hallways, stairwells, lobbies—belongs to the building’s common-system and must be supplied from the building’s own service equipment or a separate feeder dedicated to the common areas. If the unit’s equipment fed the public areas, turning off power to that unit or its disconnect could unintentionally affect the lighting in shared spaces, and it would complicate protection and coordination of circuits.

Feeder size isn’t fixed to a specific value like 60 A; it’s determined by load calculations for the building and its common areas. The idea that public areas would be allowed only on weekends doesn’t fit electrical practice at all.