Learning Objectives
Describe the following types of overcurrent: short circuit, ground fault, arc fault, and overload.
Identify different types of overcurrent protective devices and describe appropriate uses for each type.
Describe some general safety practices that are associated with the use of overcurrent protective devices.
Describe the use of selective coordination of overcurrent protective devices in electrical systems.
Describe the basic steps of the point-to-point method for calculating short-circuit currents.
Describe the basic operation of a standard molded-case circuit breaker.
Identify and describe the following types of circuit breakers: standard molded-case circuit breakers, multipole circuit breakers, ground fault circuit interrupter (GFCI) circuit breakers, and current-limiting circuit breakers.
Describe classifications, ratings, and labeling requirements for circuit breakers.
Describe basic procedures involved in troubleshooting a standard molded-case circuit breaker.
Describe the function and basic components of fuses.
Describe the ratings that apply to fuses.
Describe the basic components, markings, UL classes, and appropriate uses for single-element cartridge fuses and dual-element cartridge fuses.
Identify the basic features and appropriate uses of Edison-base plug fuses.
List some guidelines for sizing dual-element time-delay fuses and non-time delay fuses.
Describe basic procedures for troubleshooting cartridge fuses.
