The volume allowance for nonmetallic boxes is based on which components?

The volume allowance for nonmetallic boxes is based on several components that must fit within the box while adhering to the National Electrical Code (NEC) guidelines. The correct answer highlights the importance of considering wiring devices, cable clamps, and equipment grounding conductors.

When calculating the box fill, each of these components occupies a certain volume within the box. Wiring devices, like receptacles and switches, need sufficient space to be safely housed without risking overheating or creating a hazardous condition. Cable clamps, which secure cables to the box, also require space. Furthermore, equipment grounding conductors add to the overall volume since they are part of the overall circuit integrity.

In contrast, the other options do not adequately represent the necessary components for calculating box volume. While individual wiring conductors do play a role in box fill calculations, they are only part of the overall picture and do not account for the various other components that occupy space. Tools required for installation are not relevant to volume calculations, as they do not contribute to the fill of the box. Lastly, while the size of the box is crucial for determining whether it can accommodate the necessary components, it does not specifically address the volume allowances based on the actual items within the box. Thus, focusing on wiring devices