Which of the following is not allowed to be supplied from a dwelling unit panelboard?

The answer is particularly relevant in the context of electrical distribution and the rules governing the supply of electrical loads in residential settings. Typically, a dwelling unit panelboard is designed to supply circuits that serve the immediate needs of the dwelling, including receptacles for general use, lighting, and dedicated appliance circuits.

In this particular scenario, common area lighting refers to areas that are typically shared among multiple units or dwelling units, such as hallways, lobbies, or communal facilities in an apartment complex, which are not solely part of an individual dwelling unit. Such common areas are generally fed from a different panelboard that serves the entire building or the common systems, rather than from the individual panelboard assigned to a single dwelling. This helps to ensure that power distribution is managed appropriately and in compliance with local codes and regulations.

The other options—receptacles in the dining room, appliance circuits in the kitchen, and individual garage load—are all representative of circuits that cater directly to the needs of a specific dwelling unit and can legally be supplied from that dwelling unit’s panelboard. This underscores the importance of distinguishing between individual dwelling unit needs and shared facilities in the electrical design and installation process.