Electrical installations usually have several loads, often on a single circuit. Panelboards, switchboards, switchgear and motor-control centers are methods of consolidating control of those circuits into a common enclosure on common bus. One of the basic functions of switchgear is protection, which is interruption of short-circuit and overload fault currents while maintaining service to unaffected circuits. Switchgear also provides isolation of circuits from power supplies. In addition, switchgear is used to enhance system availability by allowing more than one source to feed a load
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