## Feeder SizingAccording to Table 310.16, the minimum size for the feeder from the fusible disconnect switch to the inverter is 4 AWG Aluminum (or 2 AWG Copper) with a #6 AWG Copper ground.

Note

Neutral and ground wires are not required to be sized based on the service size.## Neutral and GroundThe neutral and ground wires should be sized according to the following requirements:-

Neutral

The neutral wire must be sized to carry the unbalanced current between phases. As a general rule, the neutral wire should be equal to the size of the largest phase conductor, which in this case is

4 AWG Aluminum (or 2 AWG Copper).- Ground

The ground wire must be sized to carry the fault current, which is typically equal to the size of the service grounding electrode conductor (GEC). However, in this case, since the inverter is not connected to the service equipment, the ground wire size can be

#6 AWG Copper.## Code References- NEC 690.64: PV Systems-Locations of System Components- NEC 230.82(6): Overcurrent Protection for PV Systems- NEC 310.16: Ampacity of Conductors## Therefore, the correct feeder sizes are:- Phase conductors (L1, L2, L3)

4 AWG Aluminum (or 2 AWG Copper)-

Neutral conductor (N)

4 AWG Aluminum (or 2 AWG Copper)-

Ground conductor (E): #6 AWG Copper Flag for review