Enter the details of the conductors and ground wire to calculate the required size of your junction box.

Junction Box Sizing Formula

The following formula is used to calculate the size of the junction box required.

Box Size = (Conductor Size + Number of Conductors + Ground Size) * 2

Variables:

  • Box Size is the size of the junction box required (cubic inches)
  • Conductor Size is the size of the conductors in the box (AWG)
  • Number of Conductors is the total number of conductors in the box
  • Ground Size is the size of the ground conductor (AWG)

To calculate the junction box size, sum the sizes of the conductors and the ground wire, multiply by a factor (here simplified as 2), and you’ll get the required box size.

What is Junction Box Sizing?

Junction box sizing is the process of determining the appropriate size of a junction box to safely and efficiently house electrical connections. This involves accounting for the sizes and number of conductors, the ground wire, and ensuring compliance with electrical codes.

How to Calculate Junction Box Size?

The following steps outline how to