Thanks guys . . . this is exactly the dialogue I was looking for.
Couple of questions:
"If you're particularly concerned about keeping induced hum to a minimum, then maybe go with a metallic conduit installation so that the conduit will act as an electrostatic shield." From Pauluk
But wouldn't this increase the liklihood of capacitive reactance (coupling high freq. currents on the conduit w/ the IG conductor)?
I was talking to an authority in this area today (whose not an electrician, but understands electricity very well) who suggested that I run the insulated ground back to the service entrance grounding point in it's own conduit . . . separate from the hot and neutral. Now I've read that "for safety reasons," you can't run an IG equipment-grounding conductor in it's own conduit.
But why would that be unsafe assuming it follows an effective fault current path?
He also suggested that I use a heavier gauge wire for the ground to lower the impedance thereby reducing the possibility of parallel resonances.
Any thoughts?
Oh and one more thing you guys should enjoy!
He said that running a 220V outlet would be "balanced" by definition. But he admitted that he wasn't sure how one could get their gear hooked up to it. I know my computer is switchable to 220V, but I can't imagine how many codes I would be breaking by doing that.
One more . . .
Is there an advantage (as far as getting cleaner neutrals and grounds)to running branch circuits (for the sensative loads)from a 40 amp subpanel (w/o a transformer in between) over running them from the mains box? Is that one in the same?
OK . . . enough questions for now.
Thanks alot for your patience and expertise!
Mike
