NEMA ICS 10.1 : 2005

Part 1 - AC TRANSFER SWITCH EQUIPMENT
1 GENERAL
  1.1 Referenced Standards
  1.2 Scope
2 DEFINITIONS
  2.1 Switching Devices
  2.2 Operation of AC Transfer Switch Equipment
3 CLASSIFICATIONS
4 CHARACTERISTICS AND RATINGS
  4.1 Rated and Limited 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 Switches
      5.1.2 Bypass Isolation Switch Equipment
      5.1.3 Control Circuits
      5.1.4 Maintenance of Transfer Switch Equipment
6 SERVICE AND STORAGE CONDITIONS
7 CONSTRUCTION
  7.1 Spacings
  7.2 Test Switch
  7.3 Interlock
      7.3.1 Protection from Cross-Connection
      7.3.2 Bypass Isolation Switch Interlock
  7.4 Service Equipment
  7.5 Fire Pump Circuit Service
  7.6 Emergency Power Circuit Service
  7.7 Control Circuits
8 PERFORMANCE REQUIREMENTS AND TESTS
  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 General
      8.2.2 Test Sequence
      8.2.3 Test Samples
9 APPLICATIONS
  9.1 Motor Transfer
  9.2 AC Transfer Switch Equipment Specification
  9.3 Features for Particular Applications
Annex A Short Time Rating
Annex B Neutral Conductors in Power Transfer Systems

Applies to electromechanical automatic and non-automatic transfer switches and bypass isolation switches rated 600 volts AC or less, 60 Hertz, for use on single-phase and polyphase AC circuits.