beechigby
Member
- Location
- St. Croix US Virgin Islands
I have had this discussion here before, trying to understand the correct way to computre wire size.
My AHJ does it differently. Is he correct?
I have 16 microinvertes each putting out .9 amps at 240Vac = 14.4A
x 125% for continous duty= = 18 A
/ .65 (factor derived from temp addr of 33deg C to Ambinet temp of 30deg C= =27.69A
my AHJ says i need to use #10 THWN-2 wire cause #12 wire in the 75deg C col is rated for only 25A
Is that correct
I thought you derate the wire to find out allowable ampacity.
please help
My AHJ does it differently. Is he correct?
I have 16 microinvertes each putting out .9 amps at 240Vac = 14.4A
x 125% for continous duty= = 18 A
/ .65 (factor derived from temp addr of 33deg C to Ambinet temp of 30deg C= =27.69A
my AHJ says i need to use #10 THWN-2 wire cause #12 wire in the 75deg C col is rated for only 25A
Is that correct
I thought you derate the wire to find out allowable ampacity.
please help