I assume you have some kind of set up in use at the moment, Just put a clip on ampmeter on the cable going to your present load, take the current reading, and estimate proportionally what you will need.
No need to break out the calculator, if it's that close you are headed for trouble anyway.
Tim

Quoted from Alienagent

I assume you have some kind of set up in use at the moment, Just put a clip on ampmeter on the cable going to your present load, take the current reading, and estimate proportionally what you will need.
No need to break out the calculator, if it's that close you are headed for trouble anyway.
Tim

Not really a good practice.  To draw a comparison, if you were building a new house you wouldn't meter your old house electrical and base your decisions on that. You would design a electrical system based on the requirements of the new house. Besides that, a meter reading is only a snap shot of electrical consumption, It doesn't really reflect capacity, only usage for that moment. Random usage figures can be misleading.

To do a proper job, you want to base your decisions on your actual new requirements. Take the time to look at how your business operates, do a little research on your actual requirements, and install the electrical system you need.

Pete, I think the 45kVA was from the 600V, not 240V (600Vx100Ax0.8pf=48kW).  Even so the numbers seem a bit off.

Donnie, I wouldn't worry about determining if the building will cover the load, figure out your load requirements and then give those as your specifications in the lease.  Here's a bad analogy, if you want a 2'x4' table made, but the manufacturer's machines are in metric.  Who would you feel more comfortable making the conversion?  Better yet, what happens if the conversion is wrong?