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Selective coordination is a goal in any power distribution system design. It has been a requirement of the National Electric Code for years. However, it was felt necessary to include the requirement specifically in the Code Articles for Emergency and Legally Required Standby power systems in the 2005 NEC and article 708 of the 2008 NEC. Achieving selective coordination in a power distribution system served by two power sources with disparate impedances and capabilities presents a real challenge.
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