What must be installed to comply with code when a circuit supplies both receptacles and lighting?

To comply with electrical code requirements, when a circuit supplies both receptacles and lighting, a separate circuit is required. This is largely due to safety and load management considerations. By having a dedicated circuit for lighting, you ensure that the lighting will remain functional even if the receptacles are overloaded or tripped. This separation helps prevent nuisance tripping, enhances safety by reducing the risk of overheating and potential fire hazards, and allows for greater flexibility in managing electrical loads.

Having separate circuits also allows for better control of the lighting and receptacle use, which is particularly important in scenarios where lighting is critical, such as in hallways or stairwells. Adhering to these code requirements ensures that installations are safe and reliable, ultimately protecting both users and the property itself.