Another resource for
DMX controlled
circuit breaker panels is LynTec (
www.LynTec.com). Available in single-phase or three-phase panels. If you can get a single-phase feed this is better for mitigating
harmonics generated by all the solid state lighting
power supplies (and
phase control dimming, too). The audio and video guys have figured this out long ago, so by designing single-phase distribution in lieu of three-phase distribution, you can reduce the electrical noise
envelope for them by killing the harmonic problems before they back-infect the A/V systems.
Erich, I believe you may be referring to "balanced
Power " specifically operating at 120V line-to-line, and 60V to
ground. This is not simply single-phase
power, but a separately derived
system where a 120V secondary has a grounded center tap. It is covered by
NEC article 647-- Sensitive Electronic Equipment.
Since both ungrounded conductors of the
circuit are 60V above
ground, it comes with some Code-mandated caveats:
1. All 15A and 20A outlets must be
GFCI protected.
2. All breakers must be two-pole.
3. Any lighting equipment connected to the
system must have a means of
disconnect that opens both ungrounded conductors. This
disconnect must be lockable and within sight of the
luminaire it feeds.
4. Outlets must be marked as follows:
WARNING — TECHNICAL POWER
Do not connect to lighting equipment.
For electronic equipment use only.
60/120 V. 1φac
GFCI protected
5. There are stringent
voltage drop requirements for permanent circuits to insure that there is sufficient
fault current at 60V to
ground to trip
OCPD's on a
ground fault.
Article 647 has additional requirements that are worth reading (like how to install a 3-phase version), but I've left them out for brevity. While this type of
power works to improve
ground loops as a source of noise, it does not come "free", as noted above.
For more on balanced
power, see this link from the guys that thought it up:
http://www.equitech.com/articles/bpng.html
Cheers
ST