How does the NEC dictate the counting of devices or utilization equipment in a box wider than a single device box?

The National Electrical Code (NEC) specifies that when dealing with boxes that are wider than a standard single device box, the counting of devices or utilization equipment within that box involves considering the volume allowances based on the size and type of box being used. In particular, the NEC states that if a box is wider than a single-device box, it effectively counts as a minimum of two volume allowances.

This means that when calculating the total volume required for the conductors and devices housed in the box, you must consider the larger space provided by the wider box. Therefore, the extra volume is taken into account for proper fill calculations, ensuring that there is sufficient space for safe and effective installation of wiring and devices without overcrowding, which can lead to overheating or increased risk of electrical failure.

By recognizing that a wider box allows for more devices or greater fill capacity, it promotes safety and compliance with the NEC guidelines, thus supporting the overall goal of ensuring secure electrical installations.