Gridboss Backup L1 & L2 & Neutral up to Backup Panel:

• 3AWG THHN Copper: https://amzn.to/47Z4zni

Gridboss Backup Ground Wire up to Backup Panel:

• 4AWG THHN Copper: https://amzn.to/4pDtkvu

Conduit Size:

• Total Area for the 4 wires: 0.385

• NEC Ch9 Table 1: 40% fill for 3 or more conductors:

• Minimum area of the Conduit: 0.963 sq in

• Min ID of the Conduit: 1.11in:

Min Conduit Sizes:

• Schedule 40 PVC: 1.25”

• Schedule 80 PVC: 1.25”

• EMT Conduit: 1.25”

Notes: There are only 3 current carrying conductors so no conduit derating is needed for the cables. However it is necessary to use the .8 derating factor for the conductors due to the continuous use derating.