Isolated Ground Receptacles. The grounding terminal of an isolated ground receptacle must be connected to an insulated equipment grounding conductor [250.146(D). In most cases, an isolated ground receptacle is a waste of money. IEEE 1100, Powering and Grounding Electronic Equipment (Emerald Book) section 8.5.3.2 states, “The results from the use of the isolated ground method range from no observable effects, the desired effects, or worse noise conditions than when standard equipment bonding conf