Okay, they didn't oversize that.
Full Load Amps. And for sizing the wire and the contactor, knowing the Locked Rotor Amps (LRA) can be important too - every time the motor starts it is drawing LRA while it is at a stand-still and it drops off to FLA as it spins up - a half second to a second.
It's best to figure the voltage drop at the LRA which is worst case, so it isn't starting under brownout conditions every time.
And read the book for the well pump - the motor maker may have their own rules for wire sizing and other installation details - no follow, no warranty. If National Electrical Code, Local codes, or the motor makers instructions do not agree, the most conservative one applies.
And my book with all the formulas is out in the truck - so I didn't forget you, I'll look it up in the AM. But for a rough guess I'm going to start the math at 1/0 AL wire, and that's going to need
1-1/2" conduit. (And that would be right on the edge for fill. Might have to go to 2")If it's single phase, a simple dedicated purpose contactor like they use in an air conditioner is sufficient. You don't need overload heaters or phase monitoring on a single-phase motor.
The one thing that might be helpful is a Warrick Controls water-flow monitor that trips the well off if it runs dry. It's a simple sense probe in the output pipe that looks like a sparkplug, and if the water level in the pipe drops...
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