IEEE C37.20.1-1993

$83.42

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

Published By	Publication Date	Number of Pages
IEEE	1993	53

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Category: IEEE

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Description

Revision Standard – Superseded. This IEEE Standards product is part of the C37 family on Switchgear, Substations and Protective Relays. Low-votage 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 Vm 800V, 1000 V, 1600V, or 3200 Vdc. The continuous current ratings of the main bus in ac designs can be 1600 A, 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, rating, temperature limitations, and classification of insulating materials, insulation (dielectric) withstand voltage requirements, test procedures, and application.

PDF Catalog

PDF Pages	PDF Title
1	Title page
3	Introduction
4	Participants
7	CONTENTS
9	1. Scope and references 1.1 Scope 1.2 References
11	2. Definitions 2.1 General
13	2.2 Qualifying terms 2.3 Common or related terms
14	3. Service conditions
15	4. Ratings 4.1 General
16	4.2 Voltage and insulation levels 4.3 Rated frequency 4.4 Rated current
17	4.5 Temperature limitations
19	4.6 Current transformer ratings 4.7 Current transformer accuracies
20	5. Tests 5.1 General 5.2 Design tests
27	5.3 Production tests
28	5.4 Conformance tests 5.5 Field dielectric tests 6. Construction 6.1 General requirements
34	6.2 Materials and finish 6.3 Barriers
35	6.4 Buses and connections 6.5 Access doors and covers 6.6 Closing and tripping 6.7 Indoor LV switchgear 6.8 Outdoor LV switchgear
36	6.9 Pull box 6.10 Arrangements with stationary circuit breakers 6.11 Arrangements with drawout circuit breakers
37	6.12 Primary cable space
38	6.13 Precautionary labels 6.14 Lifting devices 7. Application guide for LV switchgear 7.1 Unusual service conditions
41	7.2 System characteristics—Voltage and frequency 7.3 Overvoltage considerations—insulation levels
42	7.4 Continuous current rating and overload capability
48	7.5 Short-circuit considerations 7.6 Nuclear power plant application 7.7 Associated devices often used in LV switchgear
50	7.8 Protection and isolation of switchgear connected to other circuit protective equipment 7.9 Overcurrent protection 8. Guide for handling, storage, and installation 8.1 General 8.2 Handling
52	8.3 Preoperation check 8.4 Removable elements 8.5 Interlocks
53	8.6 Energizing