N
ncpitts
Hi all, want to pick your collective brains.
I installed a supply to a 3 phase motor which is connected in star delta.
It is a 22kw motor .
I calculated that a cable of 6mm (4 core) by using KW x 1000 / 1.73 x 415 x 0.95 (pf)
This was installed and protected by a 60898 D MCB rated at 40A
However when the fan attempts to start the staring current gets to 88 amps (approx) and the breaker trips.
Any hints or advice welcome as motors are not my strong suit
Thanks
I installed a supply to a 3 phase motor which is connected in star delta.
It is a 22kw motor .
I calculated that a cable of 6mm (4 core) by using KW x 1000 / 1.73 x 415 x 0.95 (pf)
This was installed and protected by a 60898 D MCB rated at 40A
However when the fan attempts to start the staring current gets to 88 amps (approx) and the breaker trips.
Any hints or advice welcome as motors are not my strong suit
Thanks