For a box requiring a calculation of volume, which of the following suggests a scenario that requires a count of pigtails?

The scenario that requires a count of pigtails most logically pertains to feeding multiple receptacles. In electrical work, a pigtail is a short piece of wire that is used to connect multiple wires to a single terminal or connection point. When feeding multiple receptacles, it’s common to run a main supply line into a receptacle box and then use pigtails to connect the wiring to each of the receptacles. This ensures that each receptacle is properly connected to the circuit while maintaining a tidy and efficient installation.

In scenarios such as multiple branches on a circuit or incorporating lighting fixtures, while pigtails may be used, they are more often associated with the direct connections and terminations needed for receptacles where multiple devices need to be wired in parallel from a single supply. Adding extra grounding conductors also may involve pigtails but does not directly imply a situation that necessitates a volume calculation, making feeding multiple receptacles the most relevant scenario for counting pigtails in terms of required calculations.