We typically run a #6 combined EGC/GEC on all residential systems just to
keep it simple. The cost difference is typically negligible. We use
irreversible C-crimps to combine the wires in a roof mounted junction box.
*Jason Szumlanski*
*Fafco Solar*
On Wed, Nov 28, 2012 at 10:56 PM, mac Lewis
The separately derived issue aside, enphase inverters have an internal DC
system ground and a marked point from which a DC GEC must be installed.
Typically grounding is being done in the manner stated in 690.47(C)(3) - a
single conductor as both the DC GEC and EGC, meaning it has to be the
larger
Of *mac Lewis
*Sent:* Wednesday, November 28, 2012 7:56 PM
*To:* RE-wrenches
*Subject:* [RE-wrenches] EGC vs GEC, separately derived system
Hello wrenches,
What constitutes a separately derived system? Would you consider a breaker
tied enphase system a separately-derived system? Suddenly
Hello wrenches,
What constitutes a separately derived system? Would you consider a breaker
tied enphase system a separately-derived system? Suddenly, inspectors in
our AHJ are considering all PV systems separately derived systems and thus
requiring applying GEC sizing (as opposed to EGC sizing)
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