I am retro-fitting a small 1600sqft datacenter with one or two Liebert
units (480V 3-PH).
Can anyone tell me the realistic power draw of these units when in
full operation mode?
I will either be using a 10-ton or 20-ton unit.
Alot of people have been telling my that rule of thumb is 1KW per 1
ton, so a 10-ton Liebert should draw 10KW of power.
If my math is right, a 10-ton Liebert pulling 10KW while in operation,
would be pulling approx 12amp per phase.
480V x A x 1.732 = 10KVA, so A = 12
The reason why I bring this up is because I was talking to the
buildings electrical contractor about the power feeds to the space,
which is 200amp 480V 3-PH. I mentioned a single 10-ton Liebert, and he
said he usually wires those as a 60amp 480V circuit - which seemed
overly high? 60amp breaker, when your only pulling 12-15amps per
phase?! I know there can be startup surges, but 60amp seems really