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Ring ground
A ring ground is a type of electrical ground that is used to protect buildings and equipment from damage due to electrical surges. Ring grounds are typically used as protection against lightning strikes. They are also known as ground rings, although this term may also be applied to grounding rings that are installed in metal pipe systems to protect electrical devices such as flow meters.
==Construction==
A ring ground is typically constructed from a fairly large wire that is buried at least a few feet underground. The ring ground will usually encircle the entire building that it is trying to protect. The ring ground is used as the base of the entire building's ground system, and all components of the building's ground system, including the building structure, are connected to the ground ring. In the U.S., the National Electrical Code specifies that ring grounds must be constructed from #2 or thicker wire, must be buried at least 2 1/2 feet underground, and must have at least 20 feet of exposed copper to ensure good electrical contact with the earth.〔The National electrical code handbook, 1993, by Mark W. Earley, Richard H. Murray, John M. Caloggero〕 Ring grounds should be installed beyond the building's drip line to prevent corrosion of the ring's metal.
Ring grounds are very commonly used around communications equipment such as cell phone towers, police radio towers, and other types of radio towers and equipment buildings. They are also often used to protect computer data centers.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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