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Electrical Codes, Standards, Recommended Practices and Regulations
book

Electrical Codes, Standards, Recommended Practices and Regulations

by Robert J. Alonzo
January 2010
Intermediate to advanced content levelIntermediate to advanced
512 pages
18h 35m
English
William Andrew
Content preview from Electrical Codes, Standards, Recommended Practices and Regulations
Low-voltage residential, industrial, and commercial applications utilize air or vacuum as the
arc-interrupter mechanisms in circuit breakers. Commercial, industrial, and utility
applications, operating at voltages above 1000 V typically may use any of the mediums
depending upon the application.
Several methods are commonly used to extinguish an arc developed when a circuit breaker
opens under fault or load conditions. They include:
Lengthening the arc path
Deflection of the arc with a differential pressure
Diversion of the arc to secondary contacts
Zero point quenching
Diversion of the arc with a magnetic field (blowout coils)
Intensive cooling of the
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Publisher Resources

ISBN: 9780815520450