George Roscoe

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The predominant technologies for reducing arc-flash incident energy today rely on the speed of protective devices, remote operation, encapsulating arc-flash energy in arc-resistant enclosures, which channel energy where it is less dangerous, and on crowbars to divert the arc energy into a bolted fault. Though more thoughtfully applied than they may have(More)
Arc-flash protection systems have evolved over the past decade with a range of solutions from arc-resistant gear to circuit breaker temporary instantaneous settings. One technology that has gained acceptance, especially in medium voltage applications is light sensing as applied in arc-flash relays. Recently, arc flash relays have moved into low voltage(More)
IEEE 1584, “Guide for Performing Arc-Flash Incident Energy Calculations,” provides a method to conservatively predict the incident energy let-through by over-current devices based on the device's time-current curve or tested transfer functions. Additional testing by various manufacturers has shown that current-limiting (CL) circuit breakers(More)
Tests on the arc-containment device have confirmed that fast energy capture by transferring an arcing current from an open-air arc to an enclosed, controlled chamber provides a high degree of protection to LV switchgear. Tests confirmed the ability of the device to perform within the requirements of applicable IEEE standards for LV and arc resistant(More)
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