Transcription of Short Circuit Current Calculations - Cooper Industries
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Short Circuit Current Calculations - Cooper Industries
Short Circuit Current Calculations Introduction Several sections of the National Electrical Code relate to proper overcurrent pro- Normally, Short Circuit studies involve calculating a bolted 3-phase fault condition. This tection. Safe and reliable application of overcurrent protective devices based on can be characterized as all 3-phases bolted together to create a zero impedance these sections mandate that a Short Circuit study and a selective coordination study connection. This establishes a worst case (highest Current ) condition that results in be conducted. These sections include, among others: maximum three phase thermal and mechanical stress in the system. From this calculation, other types of fault conditions can be approximated. This worst case condi- Interrupting Rating tion should be used for interrupting rating, component protection and selective coordina- Component Protection tion. However, in doing an arc-flash hazard analysis it is recommended to do the arc- Conductor Protection flash hazard analysis at the highest bolted 3 phase Short Circuit condition and at the Equipment Grounding Conductor Protection minimum bolted three-phase Short Circuit condition.
192 ©2005 Cooper Bussmann Short Circuit Current Calculations Introduction Several sections of the National Electrical Code® relate to proper overcurrent pro-tection. Safe and reliable application of overcurrent protective devices based on
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