Used to do work in a plant that had a pair of 500hp trailer-mounted screw compressors, served by an overhead 480V span. Motor starting would cause the three individual conductors to “repel“ each other.
Running, the three conductors hung in a vertical line, but during starting they would deform into an odd triangle. It looked quite weird.
If the overload occurs very often, periodic meggering to catch cable-insulation deterioration may be wise, partly depending on the cost of a related production outage.
