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Exeric · 01-13-14, 08:27 PM

Well, I just found an answer to one of my two questions. It's here:
http://enphase.com/global/files/Enph...Vdrop_M250.pdf

I think I have to rate the neutral wire as if its taking the full current of each of the 2 phases and not derate because of the phase angle difference between the two. It is not impossible that all the power would come from one phase only under unusual circumstances and if the power exceeded the derated current capacity of the neutral wire it wouldn't be good. It also gives a table for guage size and number of microinverters with the run in feet of the home run cable so that completely solves that question.

Now I just need to find the type of homerun cable sheathing that's legal to be exposed for a few feet on the roof. Anyone?

01-13-14, 08:27 PM	#8
Exeric Apprentice EcoRenovator Join Date: Aug 2012 Location: California Posts: 274 Thanks: 19 Thanked 37 Times in 28 Posts	Well, I just found an answer to one of my two questions. It's here: http://enphase.com/global/files/Enph...Vdrop_M250.pdf I think I have to rate the neutral wire as if its taking the full current of each of the 2 phases and not derate because of the phase angle difference between the two. It is not impossible that all the power would come from one phase only under unusual circumstances and if the power exceeded the derated current capacity of the neutral wire it wouldn't be good. It also gives a table for guage size and number of microinverters with the run in feet of the home run cable so that completely solves that question. Now I just need to find the type of homerun cable sheathing that's legal to be exposed for a few feet on the roof. Anyone?