I have a new customer that has a large warehouse, import/export business.

I came to find out they have a ungrounded 480V system, with an switchgear, with indicator lights.

I don't know what the prior occupants were, nor what they manufactured, but right now, it is a warehouse...some offices and lights..

So does this system stay grandfathered, or would it be best to change it to a grounded system?

Dnk...