For luminaires, what is the volume allowance made for each type of fitting inside a box?

In the context of the National Electrical Code (NEC), when dealing with the volume allowance for luminaires inside an electrical box, a single volume allowance is made for each type of fitting. This rule is established to ensure that the box has adequate space to accommodate the conductors and devices without risking overcrowding, which could lead to overheating or electrical failures.

Specifically, the NEC provides guidelines on how much space is required for the conductors associated with each type of fitting, thus helping to maintain safety and functionality. By allowing a single volume for each type of fitting, the code ensures that the installation adheres to the necessary standards for safety, risk management, and effective operation.

This approach streamlines box sizing calculations, making it easier for electricians to design and implement electrical systems in homes and commercial buildings while complying with safety regulations. It's essential to remember that proper box fill not only complies with the NEC but also promotes the longevity and reliability of electrical connections within the overall system.