Transcription of 240.85: CHANGES TO THE 2002 NEC CLARIFY …
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240.85: CHANGES TO THE 2002 NEC CLARIFY …
2001 Cooper Bussmann, : CHANGES TO THE 2002 NEC CLARIFY REQUIREMENTS FOR THE USE OF SLASH-RATED CIRCUIT BREAKERS AND APPLICATION OF INDIVIDUAL POLE INTERRUPTINGCAPABILITIES FOR VARIOUS GROUNDING SCHEMEST ypical plant electrical systems use three-phase distribution schemes. As an industry practice, short-circuit calculations lead to the selection of overcurrent protective devices based on available three-phasefault currents. If the overcurrent devices have an adequate three-phase interrupting rating, engineers aregenerally satisfied that the system complies with NEC often, however, do three-phase faults occur? Commonly referred to as "three-phase bolted faults",these shorts require all three legs to be electrically connected.
© 2001 Cooper Bussmann, Inc. 2 SINGLE-POLE INTERRUPTING CAPABILITIES The single-pole interrupting capability of a circuit breaker …
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