How do you size a feeder suppling several motors when you only have the MCA and MOCP values?
Find a wire size that meets the MCA and OCP that meets the MOCP? Or is your question not that simple?
What are you feeding?
I said motors to keep the question simple but in actuality it's (3) Roof Top Air Conditioners and (2) Make-Up Air Units.
You size feedres by the motor listing FLA in the NEC,,,,,so it doesn't matter what info you have on those motors.....you need to go by the ned list anyway,,,,,,and it states you size 125% of the LARGEST motor and the 100% after that,,,,,all you need is voltage and horspower ratings to figure this.
You size feedres by the motor listing FLA in the NEC,,,,,so it doesn't matter what info you have on those motors.....you need to go by the ned list anyway,,,,,,and it states you size 125% of the LARGEST motor and the 100% after that,,,,,all you need is voltage and horspower ratings to figure this.
might be a bit risky, but from 440.32 can one not deduce that the MCA is 125% of the actual current and work backward from there ?How can you do this when he said that he only has the MCA and MOCPD sizes?
might be a bit risky, but from 440.32 can one not deduce that the MCA is 125% of the actual current and work backward from there ?