Question Can I Use #6 AWG with 100A Breakers in 3-Phase EG4 Setup? (Ref: Manual Page 23)

Question: Can I Use #6 AWG with 100A Breakers in 3-Phase EG4 Setup?

I'm wiring three EG4 18kW inverters into a 3-phase configuration, per EG4's published guidance. According to the manual (Page 23), each inverter’s LOAD terminals should use 6–4 AWG wire. But EG4 also recommends that, for a 3-phase setup, the inverters be connected to two 100A 3-pole backfed breakers in the AC combiner panel.

Here’s where I’m hitting a dilemma:

• NEC typically requires conductors to be sized for the breaker they're connected to. A 100A breaker usually requires #3 AWG copper minimum.

• The inverter’s max output is only 50A, and the manual-approved wire range (#6–4 AWG) supports that.

• NEC 240.4 allows undersized wire if the equipment has internal current-limiting to protect the conductor.

So my questions are:

1. Can I use #6 AWG THHN/THWN-2 copper wire from the inverter’s LOAD terminals to the 100A backfed breaker, based on the fact that the inverter’s max output is internally limited to 50A?

2. Does EG4 consider the inverter’s built-in current limit to function as sufficient overcurrent protection to allow that setup?

3. Will this configuration meet NEC or UL standards as intended?

This is for a permanent off-grid installation using three EG4 18kW inverters feeding a three-phase system via two 100A breakers, exactly as described and diagrammed in your documentation.

Thanks in advance for clarification—just want to be sure this passes inspection and aligns with both code and manufacturer intent.