Which of the following is the minimum permitted junction box volume for installation?

The minimum permitted junction box volume is a crucial aspect of electrical installation to ensure safety and functionality. The volume of a junction box is determined based on the number of conductors entering the box and the type of devices or fittings that will be housed within it.

The choice that states 10" x 10" x 4" deep offers a sufficient volume to accommodate multiple wires and devices, adhering to the National Electrical Code (NEC) requirements that mandate specific dimensions based on wire gauge and quantity. This particular size allows for a larger capacity which not only provides room for the conductors but also ensures proper strain relief, space for splices, and any additional devices that may be included in the box.

In contrast, other options either do not meet the required volume based on NEC guidelines or do not provide enough space considering the typical applications for junction boxes in residential or commercial installations. Therefore, option B is the most suitable and compliant choice for minimum junction box volume.