[RE-wrenches] EGC for Enphases

[Dave Click]

All,

I was just looking at small 4-module Andalay (Enphase 190) system tying 
into one of the Lennox solar-ready air conditioners. The engineer had 
specified the 690.47(C) GEC be run directly from the array down to the 
existing electrode. Running from the inverters is a 2+G wire to the 
Lennox panel; they are using the uninsulated ground as the circuit 
neutral. It seems to me that this violates 200.7 (grounded conductor 
marked white or grey). Also, 250.134(B) (EGC run with circuit 
conductors), about which the engineer states "I have been studying the 
NEC on this and I believe that the intent is to permit the ground to be 
carried with the current carrying conductors, not require."

Am I missing something?

Thanks,
Dave