Selectively coordinating power distribution and electrical systems in criti­cal facilities remains a hot topic among professional engineers and their facility-owner clients.

Properly coordinating AC electrical power distribution systems with over-current protective devices can be complex and difficult. It requires integrating different components, tech­nologies, manufacturers, and standards. There is no standard, cookie-cutter approach that can be applied effectively across system designs. And even though selective coordination is about to enter its third NEC* cycle as a mandated requirement — not left to engineering judgment since the 2005 cycle — issues continue circu­lating about the necessity of mandating it, what constitutes compliance and how other aspects of power system design might be compromised.

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EFFECTIVE SELECTIVE COORDINATION DESIGN