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Posted by Martin Heffels on 06/07/07 22:16
On Thu, 07 Jun 2007 15:49:42 +1000, Bernie Dwyer
<b_duibhirz@yahooz.comz.auz> wrote:
>All voltages are Australian, i.e. 240VAC, 50Hz. All calculations rounded
>up for a safety margin.
>
>Phase 1: unit/makeup. Small lights, airbrush compressors, hot water jug,
>etc. Total 14 amps
>
>Phase 2: lights on set, total 29 amps
>
>Phase 3: lights on set, camera power, field monitor, smoke machine, etc.
>Total 30 amps
>
>By my calculations, this comes to 17.52 KW of mostly resistive load, so
>no power factor to worry about.
>
>I can get a 20KVa generator for a reasonable price, and this would seem
>to fit the bill. 17.52 KW shouldn't stress a 20KVa generator. I want to
>leave a bit of a reserve. The next one up is a 60KVa generator, and it
>costs a lot more.
You have to think if you are really going to use all that power at the same
time. Quite often people tend to calculate the required load based on
adding up all the wattages which should be powered, but then only use half
of that anyway. 20KVA is a bit tight.
You will have to distribute your load better, especially if you plan on
using HMI's. If the load is inbalanced on the three phases, the genny might
start running off frequency.
I would not connect the camera-power to one of the main phases. If you
switch on a big HMI, your electronics can get zapped. gennies usually have
a seperate 240V service-outlet, so better use that for camera-power. And
also make sure that you know which phase it is connected to, just to keep
everything as sperate as possible.
cheers
-martin-
--
Official website "Jonah's Quid" http://www.jonahsquids.co.uk
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