In a box where two 12 AWG conductors enter and exit, and include a grounding conductor, how many conductor allowances are there for box fill?

To determine the number of conductor allowances for box fill in this scenario, it's important to understand how conductor fill calculations are performed according to the National Electrical Code (NEC) guidelines.

In this case, you have two 12 AWG conductors entering and exiting the box, and you also include the grounding conductor. Each 12 AWG conductor accounts for a single conductor allowance. The general rule for box fill is that you add one conductor allowance for each wire that enters or exits the box, and you also include an allowance for the grounding conductor.

Here’s the breakdown:

• The first 12 AWG conductor: 1 allowance

• The second 12 AWG conductor: 1 allowance

• The grounding conductor: 1 allowance

Adding these together:

1 (first 12 AWG) + 1 (second 12 AWG) + 1 (grounding conductor) = 3 allowances.

However, while calculating the total for the box fill, we consider the size and type of conductors involved. For each 12 AWG conductor, the NEC specifies a base allowance of 2 for the first conductor in the box. Therefore, for the two conductors, you'd keep the cumulative allowance multiplied by the number of