Circuit All Equipment in this Room to the Same Electrical Phase?
Circuit All Equipment in this Room to the Same Electrical Phase?
(OP)
I am working on the electrical design for a fairly technical office building with Video - Teleconferencing Rooms. The boiler plate information on the client rough-in and circuitry requirements indicates that all this audio-video equipment should be connected to the same electrical phase "to minimize interference". I know of wiring errors (multiple neutral-ground bonds, for example) that have caused great consternation to users of these types of equipment. I have also had requests (I think legitimate) to provide dedicated neutral conductors. However, I have not had a request to connect all interconnected equipment to the same phase. Has anyone had a similar design request? Is there a gap in my experience that prevents me from immediately thinking, "that's a great idea"?
Thanks for your valuable time.
Thanks for your valuable time.






RE: Circuit All Equipment in this Room to the Same Electrical Phase?
Thanks...
RE: Circuit All Equipment in this Room to the Same Electrical Phase?
David Castor
www.cvoes.com
RE: Circuit All Equipment in this Room to the Same Electrical Phase?
RE: Circuit All Equipment in this Room to the Same Electrical Phase?
RE: Circuit All Equipment in this Room to the Same Electrical Phase?
I did a lot of stage lighting and special effects when I was in high school, both for school productions and for the local adult drama group. Our high school principal was active in the adult drama group and would from time to time visit me back stage as I was setting up for some production or other. He would often stand near the vertical 2" pipe that was used to mount spot lights at the edge of the stage and lean with one hand on the pipe. Once or twice a year I would innocently hand him the mike connected to the "hot" amplifier. The mike was always at about 55 Volts to ground and it would get a satisfying reaction.
I liked the principal. The teacher that I didn't like was talked into zapping himself with an old model T ignition coil. Those things would throw an arc of almost an inch.
Bill
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"Why not the best?"
Jimmy Carter
RE: Circuit All Equipment in this Room to the Same Electrical Phase?
All sound system equipment is feed from one dedicated distribution panel with isolated grounds i.e. the grounding scheme required in Health care Facilities i.e. NEC Article 517. (USA)
RE: Circuit All Equipment in this Room to the Same Electrical Phase?
RE: Circuit All Equipment in this Room to the Same Electrical Phase?
Alan
"The engineer's first problem in any design situation is to discover what the problem really is." Unk.
RE: Circuit All Equipment in this Room to the Same Electrical Phase?
RE: Circuit All Equipment in this Room to the Same Electrical Phase?
At one time in healthcare work we were required to insure that all devices at a critical care patient bed location be connected to the same phase of power. This was in a licensing document that the state published-California Title 8 or something like that. I have not seen it anywhere else officially, and I don't know if that document is still around. Never actually explained the reasoning, but we assumed it had to do with patient monitoring instrumentation issues.
Good luck in your research, and it would be good to find out the reasoning behind this.
Regards,
EEJaime