How Many feed back PV breakers per Panel?

[ING23]

Hi, My PV permit was rejected because AHJ states only one PV breaker is allowed per Service Panel and they mention that only one dedicated output breaker is permitted per 705.12 2017 NEC.

Article 705.12(B)(1) States that ONE or MORE power source shall have its own circuit breaker or fusible disconnect means. ( One per Power source )
Article 705.12(B)(2)(3)(b) or commonly known as 120% rule for back feed breaker at the opposite side of the bus bar specifically mention .......power source(s) ..... referring at the possibility to have more than ONE power source (on our project Two Back feed breaker at the opposite end of the bus bar)

Am I misunderstanding this ?

 

[Fred B]

Normally when multiple PV AC sources are to brought to a service they are first brought to a combiner panel then only one feed would go to the service panel.

 

[wwhitney]

Normally when multiple PV AC sources are to brought to a service they are first brought to a combiner panel then only one feed would go to the service panel.

Maybe that's normal, but it's not required. Plan reviewer's rejection in the OP is incorrect.

Cheers, Wayne

 

[ggunn]

Maybe that's normal, but it's not required. Plan reviewer's rejection in the OP is incorrect.

Cheers, Wayne

Not necessarily; some AHJs will only allow a single point of interconnection for a PV system. Austin Energy and CPS (San Antonio) both have this rule.

 

[wwhitney]

Not necessarily; some AHJs will only allow a single point of interconnection for a PV system. Austin Energy and CPS (San Antonio) both have this rule.

The OP references a rejection per 705.12 2017 NEC. That part is incorrect.

If the AHJ is a POCO and has their own rules, then your caveat is applicable.

Cheers, Wayne

 

[jaggedben]

Hi, My PV permit was rejected because AHJ states only one PV breaker is allowed per Service Panel and they mention that only one dedicated output breaker is permitted per 705.12 2017 NEC.

Article 705.12(B)(1) States that ONE or MORE power source shall have its own circuit breaker or fusible disconnect means. ( One per Power source )
Article 705.12(B)(2)(3)(b) or commonly known as 120% rule for back feed breaker at the opposite side of the bus bar specifically mention .......power source(s) ..... referring at the possibility to have more than ONE power source (on our project Two Back feed breaker at the opposite end of the bus bar)

Am I misunderstanding this ?

AHJ is incorrect, although this is a somewhat common misunderstanding as far as I've seen in this forum.

Both breakers arguably need to be at the opposite end, so a side-by-side panel or a quad breaker may be needed.

Ask him where it says there can only be one per service panel. (Note also the rule quoted applies to all panels.) The NEC is a permissive code: unless it clearly prohibits something, or requires something else, then it's allowed.

 

[ING23]

AHJ is incorrect, although this is a somewhat common misunderstanding as far as I've seen in this forum.

Both breakers arguably need to be at the opposite end, so a side-by-side panel or a quad breaker may be needed.

Ask him where it says there can only be one per service panel. (Note also the rule quoted applies to all panels.) The NEC is a permissive code: unless it clearly prohibits something, or requires something else, then it's allowed.