This receptacle differs in construction from its self grounding counterpart. A basic diagram of this type of improper wiring can be seen below where a separately driven ground rod is used to reference the insulated equipment grounding bus in a sub panel.
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Isolated ground system wiring diagram. Isolated gnd bus equipment gnd bus ground bus neutral bus 208120v bus neutral l n iso. Wiring diagram january 11 2020 0545. Isolated ground receptacle wiring diagram wiring diagram is a simplified gratifying pictorial representation of an electrical circuit. The other will be the additional isolated insulated equipment grounding conductor which will terminate directly on the isolated grounding receptacle figure 3. It shows the components of the circuit as simplified shapes and the power and signal connections amid the devices. Gnd ground equipment enclosure ig receptacle if used main breaker receptacle panel no scale receptacle wiring diagram isolated ground 26052602dgn.
The isolated ground and the equipment ground originate from the same ground point within the transformer where they are bonded to building ground. Section 250118 provides a list of wiring methods that qualify as equipment grounding conductors. The grounding terminal for an igr is insulated from its metal mounting yoke. Isolated ground receptacle wiring diagram bryant electric cr20ig nema 5 20r 20 amp 125v commercial. An isolated ground receptacle igr can reduce electrical noise but if installed incorrectly it can create a dangerous installation. This means you must connect the grounding terminal directly to an effective fault current path by an insulated.
To originate an ig ground wire at the transformer simply carry a separate ig ground conductor from the equipment ground point in the transformer to an isolated ground bar in the secondary panel. 26052602 isolated ground receptacle wiring diagram alt default. In 1984 responding to this and other incidents the authors of the national electrical code provided installation requirements for an isolated equipment grounding.
Gallery of Isolated Ground System Wiring Diagram
