Separate ground for dedicated line

This brings up a good question for me as well. After moving into our new house (new to us, but built in the 60's)
I realized all the outlets were old, 2 prong, ungrounded lines. So after adding a couple 3 prong outlets for my surge protectors, I ran my own separate ground from those lines only. As all my electronics are hooked into that line, is there a potential problem? Why?
Thanks
joeb

If you run 2 grounds it would be: a) illegal in most places, and b) a sure-fire recipe for ground loop hums.

A ground is by definition at one point and that point is at the service entry. You are really not gaining anything and giving up a lot safety-wise with two or more separate ground points.

If your service is buried then your ground is most likely a ground rod. But it could be the water pipe also. Just bring the grounds back to the main panel the way it's supposed to be. Isolating the grounds from the receptacle boxes (if using armored cable) is all you need to do to minimize common mode noise from EMI/RFI.

Re the shield on the belden 83800 series. If you're using the simpler 83802 12/2, then of course connect the twisted shield at both the breaker bus and your outlets' grounds.
If using 83803 12/3 then you can ignore the inner shield OR connect it at the breaker to act as a drain. RSVP for more info. Cheers.

I spoke to an electrical engineer who said that both dedicated lines as well as dedicated grounds can cause ground loop noise even if everything is grounded to one common utility ground poll. He recommended having as many stereo units on one line as possible. Is there any logic to this?

Yes, except that you ALWAYS want to isolate the RF-noisy digital components from the low-level analogue (CDP, phono pre, tuner, etc.). So if you run only ONE dedicated line keep your CDP OFF it! Better to run two lines...one for digital and one for analog. Even better to run THREE if you have big monos, so they can have their own fatter one. RSVP for more info....Ern