NEMA ICS 10.2 : 2005

FOREWORD
Part 2 - STATIC AC TRANSFER EQUIPMENT
1 SCOPE
   1.1 General
   1.2 Normative references
2 DEFINITIONS
   2.1 Transfer Equipment
   2.2 Operation of static transfer equipment
3 CLASSIFICATIONS
4 CHARACTERISTICS AND RATINGS
   4.1 Rated and Limiting Values for the Main (Power) Circuit
        4.1.1 System Voltage Ratings
        4.1.2 Continuous Current Rating
        4.1.3 Rating Based on Load Characteristics
        4.1.4 Interrupting Rating
        4.1.5 Motor Starter Rating
        4.1.6 Withstand and Closing Ratings
        4.1.7 Overcurrent Protection
5 PRODUCT MARKING, INSTALLATION, AND MAINTENANCE INFORMATION
   5.1 Markings
        5.1.1 Transfer Equipment
        5.1.2 Bypass Isolation Switch Equipment
        5.1.3 Control Circuits
   5.2 Maintenance of Transfer Equipment
6 SERVICE AND STORAGE CONDITIONS
7 CONSTRUCTION
   7.1 Spacings
   7.2 Test Switch
   7.3 Interlocks and Protective Circuits
        7.3.1 Protection from Cross-Connection
        7.3.2 Bypass Isolation Switch Interlock
   7.4 Service Equipment
   7.5 Emergency Power Circuit Service
   7.6 Control Circuits
8 PERFORMANCE REQUIREMENTS
   8.1 Performance Requirements
        8.1.1 Control Circuits
        8.1.2 Ground-Fault Protection
        8.1.3 Undervoltage Monitoring Characteristics
   8.2 Design Tests
        8.2.1 Required Testing
        8.2.2 Optional Performance Verification
9 APPLICATION
   9.1 AC Transfer Equipment Specification
   9.2 Power Quality
   9.3 Motor Transfer
   9.4 Features for Particular Applications
   9.5 Considerations for Non-Linear Load Applications
   9.6 Graphical Symbol for Static Transfer Equipment
ANNEX A Non-Linear loads
   A.1 General
   A.2 Non-Linear Electrical Load
   A.3 Crest Factor (CF) of a System
ANNEX B Short Time Rating
ANNEX C Neutral Conductors in Power Transfer Systems
   C.1 Separately Derived Sources
   C.2 Non-Separately Derived Sources

Applies to static automatic and static non-automatic transfer equipment without cross-connection of sources during transfer or retransfer, with or without bypass isolation switches rated 600 volts AC or less, not exceeding 6000 amps, for use on single-phase and polyphase AC circuits.