Due to the installation of a separate, insulated conductor and the associated special outlets required, IG circuits are more expensive to install than standard power circuits. The IG is typically insulated and separate all the way back to the point of earth grounding rod outside of the building. IG is only used with special equipment that requires it. Interconnected computer equipment often benefits from single-point grounding. IG does not break ground loops, which can damage equipment like computers, printers, etc. The IG provides an insulated, separate ground path for the ground reference in electronic equipment, such as computers, hospital equipment, and audio equipment. The EG circuit includes all of the metal conduit, outlet boxes, and metal enclosures that contain the wiring and must be grounded to provide a safe return path in case of fault currents. The primary reason for the use of isolated grounds (IG) is to provide a noise-free ground return, separate from the equipment grounding (EG) return. Great care has to be taken to maintain system safety with such systems, and each case has to be carefully considered. In most countries where regulation permits it, TT is preferred for such systems as conventional wiring techniques can be used.Įxamples where an IG may be required include radio transmitters where it is not desired for RF currents associated with the antenna and its earthing to enter the mains supply wiring, and in reverse, for sensitive apparatus that should be protected from supply borne interference. It is distinct from a TT earthing system where the system electrode is also part of the safety earthing and not neutral bonded.
( Learn how and when to remove this template message)Īn isolated ground (IG) (or Functional Earth (FE) in European literature) is a ground connection to a local earth electrode from equipment where the main supply uses a different earthing arrangement, one of the common earthing arrangements used with domestic mains supplies.
( August 2018) ( Learn how and when to remove this template message) Please help improve the article by providing more context for the reader. This article provides insufficient context for those unfamiliar with the subject.
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