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Achieving IEC Type 2 short circuit coordination

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1 Author(s)
Alwin, P.E. ; Allen-Bradley Co., Milwaukee, WI, USA

It is becoming general knowledge that simply meeting UL requirements and installing equipment per the National Electrical Code does not necessarily prevent severe component damage in the event of a short circuit. Motor control and fuse manufacturers have introduced a new term to the North American market that describes the level of short circuit protection provided to the motor starter in a motor branch circuit. That new term is Type 2 Coordination. This paper explains the test and pass/fail criteria to meet the new Type 2 coordination requirements of IEC 947-4-1. Methods of meeting these requirements and a major test program involving both NEMA and IEC control gear is addressed in detail

Published in:

Industry Applications, IEEE Transactions on  (Volume:30 ,  Issue: 2 )