Separate ground for dedicated line

Find your breaker box. You'll find the pole ground there. If you want to drive a ground in your crawl space, make sure it is of the correct diameter and depth specified by your local code. It would work find.
My home uses below ground wiring but there is a rod by the house where the power comes up to the meter from the ground. Check around, you've got a meter somewhere.
Your neutrals are tied to pole ground back in the box on the neutral buss. All of your bare coppers from you home are there also.
I honestly don't think you will accomplish a lot by using a ground rod, however. Use a isolated ground recepticle, however, of hospital grade(preferably a Hubble)

Hi Stephen,

Don't run the grounds the way you described. If you ad an extra ground rod do it at the main service. Make sure you bond the new ground rod to your existing ground rod. Two ground rods are a bit much IMO. Feel free to research some of my tech talk threads for helpful hints on dedicated circuits. Sean, others and myself have discussed this subject more than once. I think we covered every possible scenario. My suggestions stem from over 20 years as an Electrician.

Thanks guys! I will skip the extra ground. There has been mention of using sheilded belden cable for a dedicated line. I was wondering how the sheild is connected: on one end to ground?

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.