Troubleshooting 3 Phase Motor Rotation: Causes & Solutions

[snakeworks]

Homework Statement

List two causes of reverse rotation in a three phase motor.

Homework Equations

The Attempt at a Solution

I've already listed incorrect phase termination as my first solution, but I'm stumped on the second. These are supposed to be "quick fix" solutions, no internal motor repair required. Any thoughts?

 

[NascentOxygen]

Here's a wild guess: a fuse in one of the phases being blown, so it's a two phase motor.

I said I'm just guessing. Do you think that might cause it?