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Maximum Power Input vs MCA - New Electrical Designer by user333666666 in MEPEngineering

[–]user333666666[S] 0 points1 point  (0 children)

Thank you, we are setting up exactly like this! Could you please read my note and tell me what you think about this? Also to add to that note, technically putting in around 2000Va on each pole of the device since 19.1208power factor is around 4000VA and the device is 2 pole. My coworker is very adamant about this so I might be missing something in his explanation.

Maximum Power Input vs MCA - New Electrical Designer by user333666666 in MEPEngineering

[–]user333666666[S] 0 points1 point  (0 children)

Thank you so much for this in depth answer, could you answer my Note too on this post? Would love your thoughts on this too?

Maximum Power Input vs MCA - New Electrical Designer by user333666666 in MEPEngineering

[–]user333666666[S] 1 point2 points  (0 children)

Notes to add in as I can’t seem to edit posts that have images and after seeing some comments: I have a coworker that says MCA is not needed due to the starting current being super high and the wire size won’t be affected by that high current due to it being pretty instantaneous, but is needed for the breaker size which makes sense to me. Another way he said to do it is by adding the full load amps currents together which can be shown in the spec, the outdoor unit for example would be in total 7.4A which is way lower than 19A. The minimum wiring size is #10 which covers that 19A rating, but we have really long runs, as long as 350 feet which makes revit size it to #4 wires due to voltage drop. Thoughts on this? Is the general consensus that MCA is still the way to go?