I have a question about sizing the MCCB and the cable for a 55kW 3 phase motor.
I have done following calculations and please correct me if wrong.
FLC = 55000/(1.732*415*0.8) , (I have assumed the PF as 0.8),
FLC = 96A
Main,delta Contactor & Over load realy;
96*0.58 = 56A,
Star contactor;
96*0.33 = 32A
If above calculations are correct what would be the ratings of MCCB/MCB
MCCB little over 56A would be enough for the starter?
or
Do I need to consider about the high transient current.
And when selecting a cable, would cable which can handle 10A be enough for the starter or again Do I need to consider about the high transient current.
I have done following calculations and please correct me if wrong.
FLC = 55000/(1.732*415*0.8) , (I have assumed the PF as 0.8),
FLC = 96A
Main,delta Contactor & Over load realy;
96*0.58 = 56A,
Star contactor;
96*0.33 = 32A
If above calculations are correct what would be the ratings of MCCB/MCB
MCCB little over 56A would be enough for the starter?
or
Do I need to consider about the high transient current.
And when selecting a cable, would cable which can handle 10A be enough for the starter or again Do I need to consider about the high transient current.
