Most of our power supplies allow for a 9 amp current draw.
For the Neutral, Live and earth ground, wire gauge for that level of current is 14 for relatively short cable lengths. Increase the gauge for longer lengths past 25 feet.
For the DC 24V output terminals to the drivers, 20 gauge is fine. If the power supply is connecting to only one driver, increase the wire gauge to 14.
What gage wire should I use from motor to driver
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WIRE GAUGE FOR POWER SUPPLY