Conduit & MCCB?

[IRAM]

I have 405 Kilowatts Asynchronous Inverter duty motors to run with 380 volts variable 415 volts 3 phase supply power factor average is. .87, what size in mm conduit I can use to run this all industry and please also tell what size MCCB I can use in main distribution panel which is direcly connected to feeder ?
Here I am going to buried conduit directly in the earth normally temperature 40 degree maximum open air and main distribution panel is 45 meters far from feeder, kindly needed experts suggestions:angel:

 

[petersonra]

I have 405 Kilowatts Asynchronous Inverter duty motors to run with 380 volts variable 415 volts 3 phase supply power factor average is. .87, what size in mm conduit I can use to run this all industry and please also tell what size MCCB I can use in main distribution panel which is direcly connected to feeder ?
Here I am going to buried conduit directly in the earth normally temperature 40 degree maximum open air and main distribution panel is 45 meters far from feeder, kindly needed experts suggestions:angel:

I don't even know what electrical code you are following there.

The NEC requires the conductors feeding a drive be rated at 125% of the full load input current of the drive. You are close to 600A so you might well need conductors with an ampacity of 700A or more if you are following the NEC.

UL listed drives usually have a maximum CB size listed in the instructions that come with the drive. The code requires you to follow that advice.

However, you also have to accommodate whatever the short circuit current that is available. There is generally a chart that tells you what tested combinations are available for various levels of available short circuit current. It will usually tell you what MCCB you can use, many times by part number.

If you are not required to abide by the NEC, none of this would apply.