steve666 - Sorry if my terminology is incorrect. Throughout my apprenticeship we called the relationships E=IxR, P=IxE, and ALL of the transpositions "Ohm's Law". I understand that's technically incorrect...
Charlie b - I'm relocating this equipment for a customer. It is fairly old and all they can tell me is that it was converted long ago. They've been in the old building something like 30 years and that building does not have 480V (nor does the new one) and I've only been there once to do a quick look. I plan on returning tomorrow and will poke around inside the control cabinet to see if I can make heads or tails of anything. Unfortunately I was told, and I quote, "a crazy old guy did all the wiring".
Here's the messed up part! This equipment is currenty being fed with #10 and is fused inside the cabinet at 30A! I didn't track down the circuit breaker feeding it, but I can imagine it's a 30. Seeing this, I asked an employee if they had problems with it tripping the breaker or blowing fuses and he claimed no... but the fuses looked very new and clean and there was an older dirty set, probably blown, laying in the bottom. I've already ran #6 to a J-Box above the new location in the new building with the intent of providing a 60A circuit. I'm concerned that 60A might be over-sized. I want to provide the proper protection for this equipment.