Lewinskih01, from all that I've read in this forum and elsewhere, you should connect the ground from your dedicated circuit directly back to your service panel bus bar. There is a lot of discussion about separate ground rods for separately grounding your circuit, but from what I read, the electrical code in the US requires all grounds to be bonded to a single location. For most of us in our home environments, this is the bus bar in the service panel. If you can manage it, it's good to use one circuit for each rectacle, with a continuous run of wire back to the service panel.
There was a very succinct post from an Audiogon member about using "isolated grounds" but I can't find it now. Here is a post from another forum that makes the same points:
There was a very succinct post from an Audiogon member about using "isolated grounds" but I can't find it now. Here is a post from another forum that makes the same points:
In a home environment, an isolated ground is completely uneccessary. A dedicated circuit installed to your HT system makes that statement even more true..
An isolated ground system is required in a commercial building because they have many miles of cable and heavy equipments such as motors and air chillers etc, that can create a rather noisy ground system that wouldn't be very compatable with any sensitive equipment that was plugged in the wall. As a result, they keep this "dirty" ground isolated to the buildings metal conduit system and run a separate safety ground to the third prong of the buildings wall receptacles.
This requires that "three wire cable" is run instead of standard electrical "two wire" cable. The cable uses an insulated hot wire, insulated neutral wire and an insulated ground wire plus the standard bare ground wire. The receptacles used don't have continuity between the third prong and the metal case to keep these two grounds isolated. These two grounds are kept separated and are tied to different ground points. Ultimately the two ground systems are then bonded together. This keeps the third prong isolated from the dirty signiture of the case ground in the building.
If you are running a dedicated two wire circuit in your home with a standard safety wire, what would adding the extra isolated ground wire gain you? Nothing. In a dedicated circuit the case ground is not being passed on through other multiple case connections, nor is there any parallel conduit interference. The safety wire in your dedicated circuit takes a direct path to the service panel without any other interference or connections. This is the lowest impedance point to ground.
Simply run standard 12 gauge two wire NMD cable you can purchase at Home Depot for your dedicated 20 amp circuit(s). It's a nice idea to purchase the better industrial grade receptacles rather than the 99 cent kind, but the isolated ground type won't gain you anything in this situation.
Generally if you're concerned about EMI/RFI interference, you would use simple local filtering to remove it. Most of these line conditioners they sell contain a good EMI/RFI filter.
http://www.hometheaterforum.com/htf/archive/index.php/t-62832.html