What is the maximum number of No. 14 conductors allowed in a 1-1/2" x 4" octagonal outlet box?

To determine the maximum number of No. 14 conductors allowed in a 1-1/2" x 4" octagonal outlet box, it is essential to refer to the National Electrical Code (NEC) guidelines for box fill calculations.

The size of the box, in this case, measures 1-1/2 inches in depth and 4 inches in width. For conductors, the NEC states that each No. 14 conductor requires a specific volume allowance, typically around 2 cubic inches. An octagonal box of this size has a volume that can accommodate multiple conductors depending on its total cubic inches.

When calculating the fill for the box, one must also consider the volume taken up by the box itself and any other components that might be present, such as connectors or devices. In this scenario, based on NEC guidelines and calculations for the given box dimensions, it has been determined that up to seven No. 14 conductors can be safely installed without exceeding the box fill capacity.

Therefore, the maximum number of No. 14 conductors allowed in this specific outlet box is seven, making it the correct answer.