Are you sure you can't? Since the bus has a
rating of 150 A and is protected by a 100 A
breaker, there is plenty of room to not over amp
the bus from the two sources of power.
The amperage from the inverter will cancel
amperage coming from the utility in the
feeder. The wire will never supply over the 100
A. The theoretical max the inverter could
backfeed would be 40 Amps in the 100 Amp cable if
no loads were being supplied. It would certainly
not be a safety issue. Am I missing something in the code?
At 12:51 AM 9/28/2012, you wrote:
Mac:
Nope.
William Miller
PS: It's pretty straight forwards, the code says "bus or conductor."
wm
PPS:
Can you customer live with a smaller feeder
breaker, say 125 amps? If so, your gold.
wm
At 06:43 PM 9/27/2012, you wrote:
Hello wrenches,
I am looking for advice on how the 120% rule
applies to feeders for a subpanel. I have this scenario:
150A bus rating on subpanel with main breaker
of 100A. The conductors feeding this subpanel
are 100A rated conductors. Can I backfeed with a 40A breaker?
Thanks
--
Mac Lewis
"Yo solo sé que no sé nada." -Sócrates
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