Pv breakers and NEC 408.36D

[wrobotronic]

Do PV breakers need to comply with 408.36D or is there something in 690 that allows the use of a regular breaker? Thank you as always.

 

[ggunn]

Do PV breakers need to comply with 408.36D or is there something in 690 that allows the use of a regular breaker? Thank you as always.

We don't need fasteners because adherence to UL1741 guarantees that if you pull a breaker out of a panel while the inverter that is backfeeding it is running, the inverter shuts down and the load side of the breaker is de-energized. The NEC reference is not in 690 but 705.12(D)(5).

 

[Carultch]

Do PV breakers need to comply with 408.36D or is there something in 690 that allows the use of a regular breaker? Thank you as always.

As mentioned, UL1741 overrides this because of the inverters automatically shutting off upon loss of stable grid voltage.

408.36(D) is not necessarily about backfeeding a breaker and having current flow in the opposite direction than normal (even though it uses that word for lack of a better word). The intent of that rule is to prevent you from energizing the load-side terminals of a stab-on breaker, and having those terminals and the breaker stabs remain energized when the breaker is removed.

It is more about the direction from which it is energized via voltage sources, than the direction of current flow.

 

[wrobotronic]

We don't need fasteners because adherence to UL1741 guarantees that if you pull a breaker out of a panel while the inverter that is backfeeding it is running, the inverter shuts down and the load side of the breaker is de-energized. The NEC reference is not in 690 but 705.12(D)(5).

Awesome. Thank you for that reference.:thumbsup: