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NEMA ICS 2.4 : 2003(R2012)
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INDUSTRIAL CONTROL AND SYSTEMS: NEMA AND IEC DEVICES FOR MOTOR SERVICE - A GUIDE FOR UNDERSTANDING THE DIFFERENCES
19-01-2021
06-12-2012
Foreword
Section 1 GENERAL
1.1 Referenced Standards
1.1.1 Scope
1.2 Markings
1.2.1 Nameplate Markings
1.2.2 UL Markings
1.3 References
1.4 Conventions
1.5 Design Philosophies
1.5.1 Traditional NEMA Contractors
1.5.2 Traditional IEC Contractors
1.5.3 NEMA Thermal Overload Relays
1.5.4 IEC thermal Overload Relays
1.5.5 NEMA Motor Controllers
1.5.6 IEC Motor Controllers
Section 2 SELECTION CONSIDERATIONS
2.1 Utilization Categories
2.2 Contractor Electrical Life
2.2.1 Electrical Life Test Parameters
2.2.2 How to Use Electrical Life Curves
2.3 Mixed Operation Life for Contractors Using
IEC Procedure
2.4 How to Use Contractor Ratings
2.5 Environmental Factors
Section 3 TERMINAL MARKING AND WIRING CONVENTIONS
3.1 General
3.2 North American Convention
4 COMPARISONS
4.1 Physical Characteristics
4.2 Electrical Life
4.3 Overcurrent Protection
4.3.1 Overload Relay Class Applications
4.3.2 Motor Acceleration Time
4.3.3 Short-Circuit Current Rating
4.4 Terminal Temperature Rise
4.5 Construction
Figures
Tables
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