National Electric Code
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The Conductors (Wires) need to be sized at 125% of highest load rating.
You mentioned 8 or 10 ga wire is what you have, #6 wire is larger. The smaller the number, The bigger the wire size. A single phase input VFD will require more amperage input. As you can see they used a 15hp inverter, I figured yesterday they used between a 15 and 20 hp inverter.
Now I am thinking #6 and a 50 amp circuit is marginal.
2020 NEC Changes to 430.122 Conductors — Minimum Size and Ampacity | JADE Learning
Changes to the 2020 NEC include the addition of several paragraphs in section 430.122. These changes will help the user to determine the correct ampacity for conductors used with power conversion equipment.
The Conductors (Wires) need to be sized at 125% of highest load rating.
You mentioned 8 or 10 ga wire is what you have, #6 wire is larger. The smaller the number, The bigger the wire size. A single phase input VFD will require more amperage input. As you can see they used a 15hp inverter, I figured yesterday they used between a 15 and 20 hp inverter.
Now I am thinking #6 and a 50 amp circuit is marginal.
