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IEEE C37.20.1-2015

IEEE C37.20.1-2015

$59.58

IEEE Standard for Metal-Enclosed Low-Voltage (1000 Vac and below, 3200 Vdc and below) Power Circuit Breaker Switchgear

Published By Publication Date Number of Pages
IEEE 2015 84
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Revision Standard – Active. Metal-enclosed, low-voltage switchgear—which contains either stationary or drawout, manually or electrically operated low-voltage ac or dc power circuit breakers in individual metal compartments, in three-pole, four-pole, two-pole, or single-pole construction—is covered. Rated maximum voltage levels are 254 V, 508 V, 635 V, 730 V, or 1058 Vac; and 300/325 V, 600 V, 800 V, 1000 V, 1200 V, 1500 V, 1600 V, or 3200 Vdc. The preferred continuous current ratings of the main bus in ac designs are 1600 A, 2000 A, 3000 A, 3200 A, 4000 A, 5000 A, 6000 A, 8000 A, or 10 000 A. For dc designs, the preferred ratings are 1600 A, 2000 A, 2500 A, 3000 A, 4000 A, 5000 A, 6000 A, 8000 A, 10 000 A, or 12 000 A. The switchgear may 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
1 IEEE Std C37.20.1™-2015 Front cover
3 Title page
5 Important Notices and Disclaimers Concerning IEEE Standards Documents
8 Participants
10 Introduction
12 Contents
13 Important Notice
1. Scope
14 2. Normative references
16 3. Definitions
17 4. Normal (usual) service conditions
18 5. Ratings
5.1 General
19 5.2 Voltage and insulation levels
20 5.3 Rated power frequency
5.4 Rated current
22 5.5 Temperature limitations
24 5.6 Current transformer ratings (LV ac switchgear)
25 5.7 Phase current transformer accuracies
26 5.8 Instrument shunts for use in LV dc switchgear
6. Tests
6.1 General
6.2 Design tests
45 6.3 Production tests
46 6.4 Conformance tests
6.5 Field dielectric tests
7. Construction
7.1 General requirements
55 7.2 Materials and finish
56 7.3 Barriers
57 7.4 Buses and connections
7.5 Access doors and covers
7.6 Closing and tripping
7.7 Indoor LV switchgear
58 7.8 Outdoor LV switchgear
7.9 Pull box
59 7.10 Arrangements with stationary circuit breakers
7.11 Arrangements with drawout circuit breakers
60 7.12 Primary cable space
61 7.13 Precautionary labels
7.14 Lifting devices
62 Annex A (informative) Bibliography
63 Annex B (informative) Application Guide for LV switchgear
B.1 Unusual service conditions
66 B.2 System characteristics—voltage and frequency
67 B.3 Overvoltage considerations—insulation levels
B.4 Continuous current rating and overload capability
72 B.5 Short-circuit considerations
B.6 Nuclear power plant application
73 B.7 Associated devices often used in LV switchgear
76 B.8 Protection and isolation of switchgear connected to other circuit protective equipment
B.9 Overcurrent protection
B.10 Grounding of dc traction power systems
77 Annex C (informative) Guide for handling, storage, and installation
C.1 General
C.2 Handling
80 C.3 Preoperation check
81 C.4 Removable elements
C.5 Interlocks
C.6 Energizing
84 Back cover

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IEEE C37.20.1-2015
$59.58