Is it permissible to use a single branch circuit for both lighting and receptacles in a dwelling unit?

The correct answer indicates that it is permissible to use a single branch circuit for both lighting and receptacles in a dwelling unit, but it is not recommended for circuits supplying general-purpose receptacles. This aligns with the guidelines in the National Electrical Code (NEC), which allows such configurations under certain conditions; however, practical considerations suggest it may not be ideal.

Utilizing a single circuit for both applications can lead to overloading, especially if high-wattage devices are frequently plugged into receptacles. Additionally, combining these loads can cause inconvenience if the circuit trips or if there is a need for maintenance on the lighting while using receptacles. For this reason, it is generally advised to separate lighting and receptacle loads, particularly for general-purpose circuits where multiple devices may be used concurrently.

The other options reflect misunderstandings of the NEC's allowances. While it's true that dedicated circuits for lighting can offer better reliability and safety, the NEC does not outright prohibit the combination of lighting and receptacles on a single branch circuit under specific scenarios. Therefore, the nuances in the code favor the idea of separation but allow for exceptions based on specific use cases.