CONTENTS Chapter 2 Chapter 3 - Techstreet

1 ViiiCopyright 2006 IEEE. All rights Two classifications of Description of a molded-case circuit breaker .. Description of a low-voltage power circuit breaker .. Document organization .. Summary .. Normative references .. Bibliography ..9 Chapter 2 Definitions, acronyms, and Definitions .. Acronyms and abbreviations .. Normative references .. Bibliography ..18 Chapter 3 Rating and testing .. Relevance of rating and The ideal circuit breaker .. The practical circuit breaker .. Basic circuit-breaker selection criteria .. The role of industry standards .. The role of safety and industry codes .. Comparison of testing requirements .. Circuit-breaker classes and Generalized application considerations.

2 References on rating and application .. Endurance considerations .. Circuit-breaker voltage rating considerations .. Frequency rating and considerations .. Temperature considerations .. Enclosure considerations .. Cable, wire, and conductor considerations .. De-rating for ambient temperature .. Circuit-breaker humidity limitations .. Circuit-breaker altitude limitations .. Circuit-breaker ampere rating .. National Electrical Code Preferred current ratings .. Load The effect of nonlinear loads on circuit breakers .. The effect of high inrush loads ..50 Copyright 2006 IEEE. All rights Overload testing of circuit breakers .. Forced-air cooling of LVPCBs .. Short-circuit interrupting rating .. Fault-current calculation considerations.

3 Circuit-breaker interrupting ratings .. Single-pole fault interruption testing .. Circuit-breaker evaluation in standards for testing .. Blow-open contact arms .. Circuit breaker useful life .. Considerations on interrupting duty and maintenance .. Integrally fused devices .. Series-connected rating .. Cascade arrangement .. Short-time rating .. Circuit-breaker evaluation for X/R ratio or short-circuit power factor .. Single-pole interrupting capability and power system design Applying ac thermal-magnetic molded-case circuit breakers usingtheir UL 489 dc rating .. Normative references .. Bibliography ..77 Chapter 4 Specific applications .. Selection considerations .. Selection approach for application Selection approach for electrical Modifications and accessories for specific applications.

4 Normal versus abnormal conditions .. Considerations for applying MCCBs, ICCBs, and Service requirements and Main circuit breakers .. Tie circuit breakers .. Feeder protection .. Normative references .. Bibliography ..133 Chapter 5 Selective coordination of low-voltage circuit breakers with other protective devices .. Low-voltage power circuit breakers .. Low-voltage MCCBs and ICCBs .. Other coordinating devices .. Coordination examples .. Normative references .. Bibliography ..155xCopyright 2006 IEEE. All rights 6 Fused and special-purpose circuit breakers .. Instantaneous-trip circuit breakers .. Mine-duty circuit breakers .. Current-limiting circuit breakers.

5 Molded-case switches .. Fused circuit breakers .. Circuit breaker and ground-fault circuit interrupter .. Arc-fault circuit Supplementary protectors .. Normative references .. Bibliography ..170 Chapter 7 Acceptance and maintenance requirements .. Maintenance program .. Maintenance of MCCBs .. Maintenance of LVPCBs .. Maintenance and testing of ICCBs .. Maintenance and testing of molded-case switches .. Maintenance of ground-fault circuit interrupters (GFCIs) .. Documenting maintenance results .. Testing program .. Failures detected .. Normative references .. Bibliography ..187 Annex 7A (informative) MCCB data record ..188 Annex 7B (informative) LVPCB data record ..194