[BC] 3 phase power and audio

[engineermike]

Guess I should explain the situation.  We have 3 phase power coming into our 
facility.  It's on an inside wall inside the building.  We can not change the 
power to single phase they have made that clear to us.  We can use a 3 phase 
generator and a 3 phase battery backup which is 3 phase in and out ONLY.  They 
also won't allow a transformer.  They are very picky about the power on campus. 
  The loads are huge and the circuit we are on also runs the stadium, coliseum, 
and numerous other large buildings so you can imagine.  Anything that touches 
beyond a simple plug in must have grace said over it by several PE's and others 
and must be installed by the electricians of their choice.  With all that said 
balancing the load is fairly simple as they will just move some of the load 
around in the panel by placing it on different breakers.  Not really much cost 
to do that.
   On a final note the folks at Axia sent me this.
"I checked about the power wiring. It will be safe to power devices with
different phases. Ethernet is designed with 1500V power isolation."
So there should not be a problem

Hope that helps
Have a good and eventless (is that a word?) weekend
Mike

Phil Longenecker wrote:
> I would suggest the studios use a transformer to get the single phase
> from the three phase. Probably not that expensive if there is going to
> be a cost to fix the 20 amp draw on the neutral. A three phase UPS may
> be three phase output also, which won't necessarily provide load
> balancing.
> 
> Analog or digital, ground is ground. Too many paths and connections will
> lead to hum and RF pickup.
> 
> 
> Phil Longenecker, DoE
> Milwaukee Radio Group
> 414.349.4130 
> 
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