Identifying NEC requirements for selective coordination

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Identifying NEC requirements for selective coordination and its effects from energy-based circuit breaker tripping
Thursday, April 18, 2013, at 11 a.m. PT /1 p.m. CT/2 p.m. ET

A properly engineered system delivers high levels of selective coordination to allow localization of a fault at the branch level, leaving the remainder of the system undisturbed and preserving continuity of service. Optimizing trip functions can affect these critical systems.

Learning objectives:

• Identify NEC requirements for selective coordination and instantaneous trip functions of circuit breakers
• Discuss the limitations of using time-current curves to achieve total coordination
• Determine how to use short circuit coordination data and optimize system design – even down to 0.01 seconds
• Offer a glimpse into the future of Selective Coordination tools for delivering three-tiered circuit breaker options based on standard inputs

Speaker: John Carlin, PE, Engineering Supervisor with Schneider Electric Engineering Services Central Studies Group, Lexington, Kentucky

• John Carlin, is an Engineering Supervisor with Schneider Electric Engineering Services Central Studies group in Lexington, Kentucky. He received the BS degree in electrical engineering from University of Arkansas in 1987. John’s experience includes 19 years with the Central Studies group performing medium and low voltage power system studies for commercial, industrial, and institutional projects, both new construction and existing facilities.

Moderator: Amara Rozgus, Editor in Chief/Content Manager, Consulting-Specifying Engineer and Pure Power

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* 3. Additional Information

* 4. Which of the following best describes your company?

* 5. Do you spend more than 20 minutes on breaker selection for coordination purposes?

* 6. What are the main constraints for achieving total coordination? (i.e. Breaker Selection, unknown wiring)

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