22 enphase micro invert

[SAP]

The branch CKT's are 14 micros on a 20Amp, 8 micros on a 15 Amp located in a solar sub panel on the roof,there is no 22 micros on one branch CKT

 

[mwm1752]

done - thanks for clarity

 

[SAP]

My fault,I see were the confusion came from in my first post,sorry everyone

 

[donaldelectrician]

SAP



A Man who can see Confusion , is a Man who knows how to walk .



Don

 

[ggunn]

We are adding 8 enphase micros to a existing 14 micros with a existing 20 amp backfeed breaker wire size 10 AWG. The system will have 22 micros at 19.8 Amps 1.25=24.75 Amps.The plans call for 40 AMP backfeed breaker with 10 AWG, Feeding a solar subpanel with a 15 Amp and 20 Amp Solar CKTS,I'm I missing something 10 AWG on a 40 AMP breaker, Is there a Exception like the air conditioning,should I just change that 40 to a 25 or 30 Amp,thanks

Under some conditions of use a #10 is adequately protected by a 40A breaker, but why? 22 Enphase 215's will fit into a 30A breaker.

 

[jaggedben]

Under some conditions of use a #10 is adequately protected by a 40A breaker, but why? 22 Enphase 215's will fit into a 30A breaker.

Notwithstanding the ampacity listed in 310.15, 240.4(D)(7) puts a 30A OCPD max on 10awg cu. Inverter outputs are not among the uses permitted to follow other rules.

 

[ggunn]

Notwithstanding the ampacity listed in 310.15, 240.4(D)(7) puts a 30A OCPD max on 10awg cu. Inverter outputs are not among the uses permitted to follow other rules.

So I ask again, why use a 40A breaker when a 30A breaker would suffice?

 

[jaggedben]

Someone made a typo, I think.