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	Subject - a true IG ckt mike D can you bring a ground wire off a ground rod to a isolated ground bar is that legal or should the ground come from your main service just have a few isolated ground recp for some cash registers.. kbsparky Mike, All grounding conductors have to return to the source in order to be complaint with the Code (even the 1999 edition). While you are permitted to install a supplemental ground rod, you still have to run that green wire back to the main service entrance panel, where the (isolated) grounding wires eventually connect to the neutral through the main bonding jumper. They would be better off using a full-time UPS isolation unit to protect those electronic registers in any case. Ryan_J 250.4(A)(5)...the earth is not a fault current path. Try dividing 120V by a 25 Ohm ground rod and tell me if you think it will trip a breaker. This is a dangerous practice. lucky1122 Isolated grounds when installed properly must float back just as the neutral bar floats until it reaches the point of origin which can be a separately derived system or a service panel.The isolated ground has to go back to the neutral which is tied to the electrode system . You cannot circumvent the neutral to clear faults by tying directly to earth ground remember conductors even grounding conductors should be run together to minimize inductance .