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More than ever, today’s electrical systems are one of the most important parts of any office building, industrial plant, hospital or other facility. A major blackout cannot be tolerated. For this reason, selective coordination is critical, and required by the NEC®, for some installations. The following address Code requirements for selective coordination and other related areas.
Here is a checklist for assuring compliance with 2014 NFPA, National Electrical Code requirements for selective coordination found in articles 620, 645, 695, 700, 701, 708 and "coordination" per article 517.
Visit this web page for details on this online design tool that greatly simplifies the selective coordination design process, including coordination between fuses and upstream Eaton circuit breakers.
An article from the July-August 2010 issue of the IAEI NEWS covers selective coordination enforcement and overcurrent protective device basics. This article was written by Tim Crnko, Manager, Eaton's Bussmann Division Training and Technical Services.
The 2005 and 2008 National Electrical Code (NEC®) expanded the mandatory requirements for overcurrent protective device selective coordination to include power circuits supplying vital life-safety loads and national security/public safety power systems.
This article by Tim Crnko, Manager, Training and Technical Services provides insight into the need for selective coordination.
National Electrical Code requirements for selective coordination are mandatory for certain electrical systems where maximum reliability of power is critical. The materials included in this section provide insight into the relationship between selective coordination, system reliability, and life safety. The reasoning for why selective coordination is mandatory.
This excerpt from Bussmann Division's 2008 SPD covers basic and advanced topics related to system coordination. Information is presented as an aid to understanding selective coordination of overcurrent protective devices.
Articles on Selective Coordination including third-party articles published in IAEI News and the necdigest provide important insight into the requirements and design of selectively coordinated systems, and the electrical systems where they are required.
The 2008 edition of the NEC® includes selective coordination requirements for Elevator Circuits, Emergency Systems, Legally Required Standby Systems, and Health Care Facilities found in the 2005 NEC® as well as additional requirements for Critical Operations Power Systems (COPS). Detailed information on these systems and the 2008 Code requirements can be found in this document.
The Bussmann series Quik-Spec™ Coordination Panelboard was designed specifically to meet the various code requirements for selective coordination in a fully fused system.
Available with up to 400 Amps for a 600Vac or less system with up to 200kA SCCR, this panelboard features ampacity rejecting branch circuit disconnects up to 100amps.
This application note contains tested fuse and circuit breaker combinations that deliver selective coordination between downstream Bussmann series fuses and upstream Bussmann series fuses and Eaton circuit breakers.
The 2008 edition of the NEC® contains all the requirements from 2005 with additional stipulations for Critical Operations Power Systems (COPS). This document covers all the relevant Code sections and how to comply with all 2008 Selective Coordination requirements.
This article addresses the role of the overcurrent protective device in system reliability.
A coordination study requires considering many electrical system components. This sample study covers fuses, transformers, conductors, and others.
