I am trying to size a panel and feeder to run some rooftop units (and a few other loads). I have been adding the "minimum circuit ampacity" (MCA)numbers to determine the feeder size. But doesn't the MCA number include a safety margin? In other words, isn't it really higher than the actual current drawn by the rooftop unit?
Is there any way I can calculate the real current drawn? The only info I am given on these units is volts, phases, MCA and "maximum overcurrent protection". I've tried looking up actual current consumptions in the manufacturers catalogs, but its not easy finding electrical numbers in those HVAC catalogs.
Steve
Is there any way I can calculate the real current drawn? The only info I am given on these units is volts, phases, MCA and "maximum overcurrent protection". I've tried looking up actual current consumptions in the manufacturers catalogs, but its not easy finding electrical numbers in those HVAC catalogs.
Steve