Hi guys,
I've only a lil` experience in motor sizing & calculation for contactor and overload. Hope you guys can show me the correct or proper calculation. My current calcluation as below, please correct me if I'm wrong.
For a 45kW motor:
Amp = 45000/(415*1.732*0.85)
= 74Amp
Main and Delta contactor & overload:
= 74/1.732
= 42.8Amp
With 10% spare:
= 48Amp
Star contactor and overload:
= 74/2
= 37Amp
With 10% spare:
= 41Amp
AB contactor:
1) 100-C60T10 x 2 pcs
2) 100-C43T10 x 2 pcs
3) 193-TCC45 (30 - 45) Amp
Question:
1) The overload should be sizing according to Main amp, 42.8Amp (48Amp with 10% spare) or the Star amp, 37Amp (41Amp with 10% spare)?
Thank you.
I've only a lil` experience in motor sizing & calculation for contactor and overload. Hope you guys can show me the correct or proper calculation. My current calcluation as below, please correct me if I'm wrong.
For a 45kW motor:
Amp = 45000/(415*1.732*0.85)
= 74Amp
Main and Delta contactor & overload:
= 74/1.732
= 42.8Amp
With 10% spare:
= 48Amp
Star contactor and overload:
= 74/2
= 37Amp
With 10% spare:
= 41Amp
AB contactor:
1) 100-C60T10 x 2 pcs
2) 100-C43T10 x 2 pcs
3) 193-TCC45 (30 - 45) Amp
Question:
1) The overload should be sizing according to Main amp, 42.8Amp (48Amp with 10% spare) or the Star amp, 37Amp (41Amp with 10% spare)?
Thank you.