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In Reply to: I agree with Steve Eddy and Charles Hansen posted by kurt s on July 5, 2010 at 17:50:21:
Hi Kurt,
Question:
Does the safety equipment ground, when used on a piece of equipment, have any benefit in regards to electromagnetic interference beings it is connected to the neutral (The Grounded Conductor) at the AC grounded derived power source?
I am not speaking of the literal earth connection.... just the fact the equipment ground is connected to the neutral, which is one side of the power source.
There must be something happening there. Siemens, GE, Toshiba, Picker, all require all the conductors supplying power to their big hi-dollar X Ray units, Cat Scanner units, MRI units, to be of the same size. They always spec a separate dedicated insulated equipment grounding conductor that does not connect to any raceway, box, enclosure, ect, that connects to a terminal on their main equipment with the other end connected to the same bar as the neutral conductor at the same derived AC grounded power system.
(Example. If the feeder conductors are 3/0 then the separate dedicated equipment grounding conductor must be 3/0.)
An additional insulated equipment grounding conductor is ran along with the other conductors which is bonded to the raceway, boxes, enclosures, ect, per NEC.
Jim
note: not sure Picker is around anymore.
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Follow Ups
- RE: I agree with Steve Eddy and Charles Hansen - jea48 21:12:21 07/06/10 (1)
- You have another situation to deal with here. - kurt s 00:48:01 07/07/10 (0)
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