HomeMy WebLinkAboutB14-0266 conductor sizing.pdf
Page 5 of 6 7/7/2014
Conductor Sizing
From Inverters to Inverter PV Combining Panel (for a 16 panel circuit):
Nameplate maximum continuous output current:
1A
1A x 125% x 16 inverters = 20A
#10 THWN-2 Table 310.16
40A (75ºC column, see note 240.4(D))
For 8 current carrying conductors use .70
40A x .70 = 28A
Temperature correction factor Table 310.16
28A x .77 = 21.56A
From PV Combining Panel to AC Disconnect/Backfeed Breaker:
Nameplate maximum continuous output current:
1A
1A x 125% x 50 inverters = 62.5A
#6 THWN-2 Table 310.16
65A (75ºC column)
No Conduit fill adjustment Table 310.15 (B)(2)(a)
No Temperature correction factor Table 310.16
Overcurrent Protection Devices
4 - 20A two pole breaker Inverter Output Combining Panel
1 - 70A two pole breaker Backfeed Breaker