What is the minimum general lighting load in VA per square foot for a single-family dwelling according to the NEC?

The correct choice of 3 VA per square foot as the minimum general lighting load for a single-family dwelling according to the National Electrical Code (NEC) stands on regulatory guidelines established to ensure safe and sufficient lighting in residential spaces. This standard is meant to provide a baseline for the expected demand on the electrical system, taking into consideration both functionality and safety.

By defining this minimum lighting load, the NEC aims to ensure that dwellings are equipped with adequate lighting to meet basic needs, whether for everyday activities or emergency situations. A load of 3 VA per square foot serves as a guideline to help electrical designers and contractors calculate the appropriate capacity and size of feeders and service equipment required for new constructions and renovations.

Understanding this minimum requirement is crucial for anyone involved in residential electrical installations, as it directly informs the sizing of circuit breakers, the selection of wiring, and the overall load calculations for the dwelling's electrical system. Adhering to these guidelines not only promotes energy efficiency but also supports compliance with safety regulations.