Number of submersible pumps = 2
Full load amps of each pump = 35.1
connection = star delta.
star contactor = 18 amps
delta contactor = 25 amps
Main contactor = 25 amps
overload = 30 to 40 amps
similarly for the other pump.
main breaker size = 100 amps
calculation for the feeder breaker:
Feeder protection [430.62(A)] isn’t greater than the largest branch circuit ground fault and short circuit protective device plus the other motor FLC.
Branch breaker =
so pump 1 = (35.1 * 2.50) = 87.75 jumping to next size = 100 amps
pump 2= (35.1 * 2.50) = 87.75 jumping to next size = 100 amps
Main feeder breaker = 100 + 35.1 = 135.1 so going down = 125 amperes.
Note:
The branch breaker calculated by the manufacturer is 100 amps, if we apply NEC then it must be 125 amperes for both pumps. i.e. QM in the drawing. kindly clarify .
Feeder which i calculated shall be 125 amperes or some thing else. kindly advise.
Full load amps of each pump = 35.1
connection = star delta.
star contactor = 18 amps
delta contactor = 25 amps
Main contactor = 25 amps
overload = 30 to 40 amps
similarly for the other pump.
main breaker size = 100 amps
calculation for the feeder breaker:
Feeder protection [430.62(A)] isn’t greater than the largest branch circuit ground fault and short circuit protective device plus the other motor FLC.
Branch breaker =
so pump 1 = (35.1 * 2.50) = 87.75 jumping to next size = 100 amps
pump 2= (35.1 * 2.50) = 87.75 jumping to next size = 100 amps
Main feeder breaker = 100 + 35.1 = 135.1 so going down = 125 amperes.
Note:
The branch breaker calculated by the manufacturer is 100 amps, if we apply NEC then it must be 125 amperes for both pumps. i.e. QM in the drawing. kindly clarify .
Feeder which i calculated shall be 125 amperes or some thing else. kindly advise.
