photvoltic and afci breakers in ma.

[t gallagher]

if I am understanding what im reading there is a requirement for these but there are a lot of tripping going on that's unexsplained?
seimans

 

[jaggedben]

Point one: They are only required for micro-inverters that utilize an exposed AC cable on the array.

Point two: There doesn't seem to be any AFCI breakers that are clearly listed to be backfed, and that is also a requirement, so it's not clearly possible to use AFCI breakers in a code compliant manner. See this thread for a full discussion.

 

[Carultch]

Point one: They are only required for micro-inverters that utilize an exposed AC cable on the array.

Point two: There doesn't seem to be any AFCI breakers that are clearly listed to be backfed, and that is also a requirement, so it's not clearly possible to use AFCI breakers in a code compliant manner. See this thread for a full discussion.

Time for good old 90.4.