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The Use of Low-Voltage Current-Limiting Fuses to Reduce Arc-Flash Energy

Richard L. Doughty, Fellow, IEEE, Thomas E. Neal, Terry L. Macalady, Vincent Saporita, Member, IEEE, and Kenneth Borgwald

SINCE energy is the integral of power with respect to time, one would expect, and tests have confirmed, that the thermal incident energy from an electric arc exposure is directly proportional to the time duration of the arc [1], [2]. Any mechanism, which detects the presence of the arc and opens, the circuit in a relatively short time is effective in limiting the amount of incident energy exposure created by the arc. One common class of protective equipment that provides quick circuit opening in the event of an arc with high currents is the current-limiting fuse. When operating in the current-limiting range, the fuse typically opens the circuit in less than 1/2 cycle or 8.3 ms.

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19. Code Change Library Video/DVD — 2005

Nearly 5,000 changes were proposed for the 2005 NEC! Over 225 of them will have a significant impact on designing, installing and inspecting electrical systems.

This package includes the following 2005 Code Change products:

  • Code Changes
  • 2 DVD Guides to the Code Changes
  • 16 hour online code change program
  • 2005 NEC Code Tabs, and 1 MP3 Audio CD

Product Code: 05CCP
MultiMedia: Tape & CDROM & DVD

 

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