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Selective Coordination – What the Inspector Needs to Know

Selective coordination has been a requirement in the NEC since 1993 when it was first required for circuits with multiple elevators. Since then, additional...

Code Hunter: Coordination, 2014 NEC

The Questions To play this game, you need a sharp eye, a quick mind and a 2014 National Electrical Code book. (Fill-in-the-blank questions are looking for...

Selective Coordination with Circuit Breakers

Introduction Photo credit: enerprom.si Introduction to Selective Coordination Selective coordination is often referred to simply as coordination. Coordination is defined in NEC® 240.2 as: “The proper...

Selective Coordination for Critical Systems per the 2014 NEC

Selective coordination has been required for multiple elevators, supplied from a single feeder, since the 1993 National Electrical Code (NEC®). This requirement was based on a...

Selective coordination and arc flash protection study in electrical design —...

This subject has been already discussed in one of my previous articles. However, confusion on this issue does not appear to subside among the...

Selective Coordination of Emergency Systems — Taking the mystery out of...

Selective coordination of the emergency system is intended to provide a high level of reliability and continuance of supply needed for systems providing emergency...

Selective Coordination as a Source of Pride

Can you think of an accomplishment that is a source of great pride? My foray into selective coordination served as my introduction to the electric...

Selective Coordination Enforcement: Overcurrent Protective Device Basics

The Basics of Selective Coordination Selective coordination is achieved when overcurrent protective devices are chosen such that whenever an overcurrent occurs only the nearest upstream...

Selective Coordination – Responsibilities of the AHJ

Selective coordination ensures proper isolation and localization for all possible overcurrents (from overloads to maximum short-circuit currents at the point of application) to the...

New Requirements for Selective Coordination

For certain vital circuits, the 2005 NEC requires that all overcurrent protective devices be selectively coordinated with all supply side overcurrent protective devices in...
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