Which NEC table would you consult for box fill calculations?

The correct choice involves consulting Table 314.16 of the National Electrical Code (NEC) for box fill calculations. This table provides guidance on how to determine the maximum allowable number of conductors, devices, and other components that can be safely placed in an electrical box. Box fill calculations are critical because they ensure that electrical boxes do not exceed the capacity limits, which can prevent overheating and potential fire hazards.

This table takes into account the sizes and types of conductors, as well as the presence of devices such as switches and receptacles, to provide a thorough understanding of the spatial requirements for safe electrical installations. Utilizing this table is essential for electricians and engineers to design systems that comply with safety standards and codes.

The other tables mentioned serve different purposes and are not applicable for box fill calculations: Table 310.15 relates to the ampacity of conductors, Table 300.5 outlines the depth of burial for underground installations, and Table 250.122 addresses the size of equipment grounding conductors. Thus, for box fill, Table 314.16 is the appropriate resource to reference.