I just wanted to run this by the local EE here
We installed a ground mount array in which there are two array's and two inverters.
The distance from the array's to the inverters and service is 400'
We used initially 2 #2 AL USE direct burial cable for current carrying conductors and a #4 for the EGC. for each array
The inspector made us replace the ECG with a #2 but only one conductor.
All bonding and grounding takes place at the array as we have 28 pipes buried in concrete and 2 ground rods driven at the array.
So my question is thus
What purpose does the ECG serve in addition to the bonding and grounding at the array.
The sizing of the conductor is based on article 250 that states that grounding conductors shall be the same size as current carrying conductors in circuits under 30A
In Article 690.43 states that ECG do not have to be increased in size to compensate for voltage drop which is the case here. and minimum size is #14.
I know the AHJ is always right.