|Double Check My Math? is being discussed in the ControlBooth Lighting and Electrics forum; I have a SR48 dimmer rack fed by a 200A disconnect . W=VA W=120*200 W=24,000 Assuming a 750 HPL Source ...|
"Why be gentle, it's rental!"
[I]Utinam logica falsa tuam philosophiam totam suffodiant![/I]
No, there's more to it then that.
First, single phase or 3 phase installation?
If it's 3 phase (208Y/120), then you have 200A per leg, or 200A*208V*sqrt(3)=72kVA. This could also be looked at as 200A*120V*3=72kVA. (208V=120V*sqrt(3)) Assuming W=VA, 72kW/750W=96 fixtures.
If it's single phase (240/120), then you still have 200A per leg, but you only have 2 legs. This would be 200A*120V*2=48kVA. Assuming W=VA, 48kW/750W=64 fixtures.
Dang-nabbit, beat several times over.
By the way you may notice that things work out to 12, 48, 64, 96, etc. (circuits/fixtures), this is not be accident! Things are worked out to come easily to these easy to work with.
DAE Concert Lighting
Intelligent Lighting Solutions
"Oh, that switch also fed the Hotel ?"
hum-head friend about this problem a few weeks ago and we assumed that it was 200 A total...
The bad thing is that, the person who held my position before me had a Sensor Portable Pack installed on the catwalks because she assumed (incorrectly, like I did!) that our power was so severely limited. Anyone want to buy an empty Sensor Portable Pack?
Thanks for all the help guys!