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Fault Current Calculations and NEC Requirements

2013 Eaton. All rights reserved. Fault Current Calculations and NEC Requirements Dan Neeser Field Application Engineer Cell: (314) 753-2514 2 2013 Eaton. All rights reserved. Question??? How many attendees have had a customer designing or owning a commercial or industrial facility ask for the Fault Current provided by the utility? Why are they asking this question and what answer do you provide? 3 2013 Eaton. All rights reserved. Answer Depends on Concern Proper Application of Equipment Interrupting Rating Short-Circuit Current Ratings Meeting Requirements of Selective Coordination Arc Flash Protection of Employees 4 2013 Eaton. All rights reserved. OCPD - Interrupting Rating ( ) NEC Article 100 Definition Highest Current an OVERCURRENT DEVICE (fuse or circuit breaker) is rated to safely interrupt. Self protection rating only NEC Interrupting Rating. Requires the overcurrent device to have an interrupting rating not less than the maximum available Fault Current .

of curves for fault current available) • Even small changes in fault current can result in lack of compliance Short-Circuit Current Study By Ace Engineering 10 100 1K 10K 100K 0.01 0.10 1 10 100 1000 CURRENT IN AMPERES 30 200 800 MCCB.tcc Ref. Voltage: 480 Current in Amps x 1 30 200 800 MCCB.drw S 30A MCCB 18kAIR 200A MCCB 35kAIR 800A MCCB ...

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