[RE-wrenches] 120% rule applying to conductors

[Drake]

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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>Miller Solar
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>email: william at millersolar.com
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