NEMA SG 4:2009(R2013)
Withdrawn
A Withdrawn Standard is one, which is removed from sale, and its unique number can no longer be used. The Standard can be withdrawn and not replaced, or it can be withdrawn and replaced by a Standard with a different number.
ALTERNATING CURRENT HIGH-VOLTAGE CIRCUIT BREAKERS
21-04-2023
03-12-2013
Foreword
Section 1 - GENERAL
1.1 Scope
1.2 References
1.3 Definition
1.3.1 Applicable American National Standards
Section 2 - RATING STANDARDS
2.1 Applicable American National Standards
Section 3 - FUNCTIONAL COMPONENTS AND REQUIREMENTS
3.1 Applicable American National Standards
3.2 Operating Mechanisms For Outdoor Circuit Breakers
3.2.1 All Operating Mechanisms
3.2.2 For Pneumatic Mechanisms Only
3.2.3 For Spring Charge Mechanisms
3.2.4 For Hydraulic Mechanisms
3.3 Requirements for Terminals and Connections
3.3.1 Threaded Terminals
3.3.2 Flat Terminals
3.3.3 Ground Terminals
3.4 Instrument Current Transformers
3.4.1 Ratings
3.4.2 Characteristics
3.4.3 Test Procedures
3.5 Undervoltage Trip Device
3.6 Secondary and Control Wiring (Small Wiring)
Section 4 - TESTING STANDARDS
4.1 Applicable American National Standards
4.2 Radio Influence Voltage Tests as Applicable
(Design Test)
4.3 Noise Requirements
4.3.1 Terminology and Definitions
4.3.2 Noise Exposure Conditions
4.3.3 Noise Level
4.3.4 Noise Measurement Equipment
4.3.5 Design Tests
Section 5 - SPECIAL APPLICATION
5.1 Repetitive Duty Circuit Breakers for Arc Furnace
Switching
5.1.3 Operating Conditions
5.1.4 Conditions of the Circuit Breaker
5.1.5 Minimum Operations Under Fault Conditions
Section 6 - RECOMMENDED INSTALLATION, OPERATION, AND
MAINTENANCE PROCEDURES
6.1 General
Appendices
A BUSHING POTENTIAL DEVICES FOR TANK-TYPE OUTDOOR OIL
CIRCUIT BREAKERS
B TYPICAL CONNECTION FOR SECONDARY BURDENS
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