Phase voltage monitors were installed about six months ago and have tripped but no motor failures. This makes us suspect that the power supply(460/3/60) may have been the culprit.
The customer is a TV station with lots of electronics and UPS systems which have not been affected.
I once heard that power spikes show up the the largest load in the building and in this case the compressors are the biggest motors.
Any truth to this and why?