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IEEE 1458 2005

$37.38

IEEE Recommended Practice for the Selection, Field Testing, and Life Expectancy of Molded Case Circuit Breakers for Industrial Applications

Published By Publication Date Number of Pages
IEEE 2005 55
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New IEEE Standard – Active. A recommended procedure for the selection, application, and determination of the remaining life in molder case circuit breaker is provided.

PDF Catalog

PDF Pages PDF Title
1 IEEE Recommended Practice for the Selection, Field Testing, and Life Expectancy of Molded Case Circuit Breakers for Industria
3 Title Page
5 Introduction
Notice to users
Participants
7 CONTENTS
9 1. Overview
1.1 Scope
1.2 Purpose
2. Normative references
10 3. Molded case circuit breaker basics
3.1 Molded case circuit breaker basics
3.2 Circuit breakers in general
11 3.3 Circuit breaker standards
12 3.4 Contacts open and close
3.5 Means to open and close contacts
3.5.1 Opening and closing contacts
3.5.2 Over-toggle
13 3.5.3 Two-step stored energy
3.5.4 Electromagnetic assistance
3.6 Means to extinguish an arc
3.6.1 Current zero and arc extinguishing
3.6.2 Voltage and arc extinguishing
14 3.6.3 Arc extinguishing methods
3.6.4 Arc extinguisher (chute)
15 3.7 Means to respond to overcurrents/commands
3.7.1 Trip units
16 3.8 Method for enclosing circuit breaker components
3.8.1 Molded insulating material type
17 3.9 Method for mounting circuit breaker
3.9.1 Fixed mounted
18 3.9.2 Removable
3.9.3 Drawout
19 3.10 Molded case circuit breaker components
3.10.1 Molded case (frame)
20 3.11 Thermal conditions
21 3.12 Short-circuit conditions
22 3.13 Ground fault conditions
3.14 Types of trip units
3.14.1 Electromechanical trip unit
25 3.14.2 Electronic trip units
26 3.15 Circuit breaker selectivity
27 3.15.1 Instantaneous pickup
3.15.2 Long-time pickup and delay
3.15.3 Short-time pickup and delay
3.15.4 Ground fault pickup and delay
28 3.15.5 Special calibrations and applications
4. Molded case circuit breaker safety considerations
5. Selection of molded case circuit breakers
29 5.1 Standard rated molded case circuit breakers
30 5.2 100-Percent rated molded case circuit breakers
5.3 Voltage rating election
31 5.4 Current ratings
32 5.5 Current rating selection
5.6 Selection of circuit breaker current rating
34 5.7 Interrupting rating
6. Estimated available fault current at transformer secondary
36 7. Simplified method to calculate available fault current at transformer secondary
37 7.1 METHOD 1: Simple approximation
39 7.2 METHOD 2: Accounting for cable between transformer and molded case circuit breaker
43 8. Procedures for field testing and determining the remaining life of molded case circuit breakers
46 8.1 Rated current hold in test
47 8.2 Exposed face and lug temperature check
8.3 Mechanical operation tests
48 8.4 Insulation resistance test
8.5 Individual pole resistance test (millivolt drop)
49 8.6 Inverse-time overcurrent trip test
53 8.7 Instantaneous overcurrent trip test
54 8.8 Accessory devices
55 Annex A (informative)—Bibliography
IEEE 1458 2005
$37.38