I'm working on a system and am curious about sizing disconnects. I received a quote from a manufacturer for combiner boxes with integrated disconnects and they've quoted a combiner with a 96 A rated disconnect for a combiner with 8 strings of 11 being combined. My module Isc rating is 8.89 A x 8 strings = 71.12 A Isc on my output circuit. So per 690.8 my max cont. current on my output circuit is 71.12 A x 1.25 = 88.9 A. So the combiner disconnect rating is above my continuous current.
My question is, are disconnects required to be sized to a minimum of 125% of the continuous currents similar to wires? If so 125% of my continous currents would be 88.9 x 1.25 = 111.125 A which is over the rating of the disconnect at 96 A. Are disconnects rated for 100% continuous duty? I'm assuming the manufacturer knows what they are doing and would size their disconnects appropriately for an 8 string combiner. What am I missing here?
My question is, are disconnects required to be sized to a minimum of 125% of the continuous currents similar to wires? If so 125% of my continous currents would be 88.9 x 1.25 = 111.125 A which is over the rating of the disconnect at 96 A. Are disconnects rated for 100% continuous duty? I'm assuming the manufacturer knows what they are doing and would size their disconnects appropriately for an 8 string combiner. What am I missing here?