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Short circuit current ratings for enclosed drives

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This paper compares the exiting methods for determining short circuit current ratings. It also introduces the changes brought forth in the 2005 National Electrical Code (NEC2005) and in UL508A, Industrial Control Equipment, as well as the impact these changes will have on the industry.

By Leon Kythas, PE, and Mark Taylor, Schneider Electric USA

Some of the standards are applicable to all types of industrial controls panels; however, this paper focuses on the Short Circuit Current Ratings (SCCR) of enclosed AC drives.

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