Transcription of Short Circuit Current Calculations - Cooper Bussmann
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Short Circuit Current Calculations - Cooper Bussmann
192 2005 Cooper BussmannShort Circuit Current CalculationsIntroductionSeveral sections of the National Electrical Code relate to proper overcurrent pro-tection. Safe and reliable application of overcurrent protective devices based onthese sections mandate that a Short Circuit study and a selective coordination studybe conducted. These sections include, among others: Interrupting Rating Component Protection Conductor Protection Equipment Grounding Conductor Protection Marked Short - Circuit Current Rating;- (3) Meter Disconnect- Industrial Control Panels- (B) Air Conditioning & Refrigeration Equipment- (A) Industrial Machinery Selective Coordination- Health Care Facilities - Selective Coordination- Essential Electrical Systems In Healthcare Systems- Selective Coordination for Elevator Circuits- Emergency Systems- Legally Required Standby SystemsCompliance with these code sections can best be accomplished by conducting ashort Circuit study as a start to the analysis.
©2005 Cooper Bussmann 193 Short Circuit Current Calculations Three-Phase Short Circuits Basic Point-to-Point Calculation Procedure Step 1. Determine the transformer full load amps (F.L.A.) from
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