No VFD in building UPS are on disconnects straight off main buss bars monitoring was done on the secondary side of the transformer at the CT's All recording UPS are 480 feed. How do I determine if I am having transient faults in my secoundary feeds to my mains without a massive shut down and meggering? Some issues we are seeing are not related to power quality from the grid. Grounding for the UPS is up to code and has been evaluated as well as building ground.
