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Re: 20 AMP power to motor controllers?
The limiting factor regarding what motors can use what breakers is purely the fact that some combinations will not work well. As long as your wire gauge matches the breaker size, safety will not be an issue, as such, they appear to have decided not to create a rule that explicitly lists allowed or disallowed motor and breaker combinations.
My advice is to find the motor documentation and prioritize which motors get the 40 amp circuits based on that.
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