proper wire size for cnc machine

[jeeprump]

hi, what is proper way to calculate wire size for cnc machine? Should be calculated on full load current?(our aplications use 1/3 of the full load). Is there any regulation ,code for that?

 

[whycliffrussell]

The 'Code (Counrty)' says that the wire size should be sufficient to support the ampacity of the machine plus 125% AND the voltage drop should not be more than 3% between the panel and machine, AND not more than 5% from the utility to the machine.

 

[waross]

The starting current will be the same regardless of what load is applied after the motor is running. This is part of the determination of minimum wire size.
respectfully