Radar, you're not leaving me out of anything....

I am reading everything you guys say, and learning. I have more input, but I am waiting to hear responses to kinda formulate my next post...

I agree to what Bob is saying, however my readings were taken off a subpanel, @ 250' away from the service. Somehow I think I need to contact the power company, and do a whole plant survey with readings from the service to each subpanel, draw a line diagram and possibly correct in different areas rather than a bulk correction at the service entrance....

The sub panel is a 400A 480v panel. The customer is a huge machine shop.

What is your guys take on this idea?

Dnk..