IEEE C37.20.1 1987

$30.88

IEEE Standard for Metal-Enclosed Low-Voltage Power Circuit-Breaker Switchgear

Published By	Publication Date	Number of Pages
IEEE	1987	36

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Description

New IEEE Standard – Inactive – Superseded. Low-voltage metal-enclosed switchgear, which can contain either stationary or drawout, manually or electrically operated low-voltage AC or DC power circuit breakers in individual grounded metal compartments, in three-pole, two-pole, or single-pole construction is covered. Rated maximum voltage levels can be 254 V, 508 V, or 635 Vac and 300/325 V, 800 V, 1000 V, 1600 V, or 3200 Vdc. The continuous current ratings of the main bus in ac designs can be 1600 Al 2000 A, 2500 A, 4000 A, 6000 A, 8000 A, 10,000 A, or 12,000 A. The switchgear can also contain associated control, instruments, metering, protective, and regulating devices as necessary. The standard deals with service conditions, ratings, temperature limitations, and classification of insulating materials, insulation (dielectric) withstand voltage requirements, test procedures, and application.

PDF Catalog

PDF Pages	PDF Title
10	Scope and References 1.1 Scope 1.2 References
11	Definitions 2.1 Types of Switchgear Assemblies
12	2.2 Qualifying Terms 2.3 Common or Related Terms
13	Service Conditions Ratings 4.1 General
14	4.2 Voltage and Insulation Levels 4.3 Rated Frequency 4.4 Rated Current Voltage and Insulation Levels AC LV Switchgear Voltage and Insulation Levels DC LV Switchgear
15	4.5 Temperature Limitations Switchgear Assemblies
16	4.6 Current Transformer Ratings 4.7 Current Transformer Accuracies Switchgear Assemblies
17	Tests General Design Tests 5.2.1 Dielectric Tests LV Switchgear
18	5.2.2 Rated Continuous Current Tests 5.2.3 Short-Time Current Withstand Tests
19	5.2.4 Short-circuit Current Withstand Test Copper Conductors for Use in Continuous Current Tests Copper Conductors for Use in Continuous Current Tests
20	5.2.5 Mechanical Endurance Tests 5.2.6 Flame Resistance Tests 5.2.7 Rod Entry Test 5.2.8 Paint Qualification Test
21	Rain Test for Outdoor LV Switchgear Production Tests 5.3.1 Dielectric Tests
22	5.3.2 Mechanical Operation Tests Grounding of Instrument Transformer Case Test Electrical Operation and Control-Wiring Tests Conformance Tests Field Dielectric Tests Construction 6.1 General Requirements Buses and Primary Connections
23	6.1.2 Grounding Control and Secondary Circuits and Devices
25	6.1.4 Miscellaneous Control Power Transformer ShortCircuit Protection
26	6.2 Materials and Finish 6.3 Barriers 6.4 Buses and Connections 6.5 Access Doors and Covers Closing and Tripping Indoor LV Switchgear
27	Outdoor LV Switchgear 6.9 Pull Box 6.10 Arrangements with Stationary Circuit Breakers 6.11 Arrangements with Drawout Circuit Breakers
28	6.12 Padlocking 6.13 Primary Cable Space 6.14 Precautionary Labels 6.15 Handling Devices 7 Application Guide for LV Switchgear Unusual Service Conditions Minimum Areas for Multiple Cable Connections
29	7.1.1 Ambient Air Temperature Above 40 “C 7.1.2 Ambient Air Temperature Below – 30 “C 7.1.3 Application at Unusual Altitudes 7.1.4 Modification of Equipment for Unusual Environment Altitude Correction Factors
31	System Characteristics-Voltage and Frequency Overvoltage Considerations-Insulation Levels Continuous Current Rating and Overload Capability
32	Short-circuit Considerations Nuclear Power Plant Application Associated Devices Often Used In LV Switchgear Circuit-Breaker Loads
33	Circuit Protective Equipment Overcurrent Protection 8 Guide for Handling Storage and Installation 8.1 General
34	8.2 Handling
35	8.3 Preoperation Check 8.4 Removable Elements 8.5 Interlocks 8.6 Energization 9 Bibliography