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On our HAAS machines. I am not at the shop presently, I believe the nameplate is 40 A. Initially there is a very short current spike to charge the capacitor bank. In an idle state, servos off and the coolant pump off, line current is about 1 A. Servos on and not moving adds a little. However, on the newest machine the Z axis servo supports the weight of the head instead of a counter weight or nitrogen spring, and thus draws more current.
We seldom run heavy cuts and therefore are seldom at full spindle load. However, on our lathe because of the high inertia of the spindle and chuck there can be fairly consistent high loads when facing at constant surface speed where the spindle is constantly accelerating and decelerating.
I believe our machines are fed with #8 wire of not over 75 ft to the main panel. From the main panel to the pole is much heavier and maybe 200 ft.
If your machines are to be run at full power most of the time, then voltage drop might be a concern. Otherwise the smallest wire per the nameplate requirements is probably OK, except for the EGC which may need to be much larger. However, I am happy to sell you isolators to avoid over sizing the EGC.
Where are you located?
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