Trainee Name____________________________

Trainee Social Security Number: ____________

Trainee Status:  _______

Course Name: ___________________

Course Code: ___________________                                 

National Center Course Number: ___________

Date Course Completed: ____________________

Performance Criteria Completed:  _____________

Performance Objectives:

                                                                                                                    Pass     Fail                  

Topic 1: Circuit Breaker Operation: Switch Functions

1.1  Identify molded-case circuit breakers and power circuit
breakers.

1.2  Explain the terms primary power and control power.

1.3  Describe or demonstrate how the contacts in a typical
circuit breaker can be opened manually.

1.4  Describe or demonstrate how a shunt trip coil can be used
to electrically trip a typical circuit breaker.

1.5  Describe or demonstrate how the contacts in a typical
circuit breaker can be closed manually.

1.6  Explain how a solenoid can be used to close breaker
contacts electrically.

Topic 2: Circuit Breaker Operation: Protective Functions

2.1 Explain the function of a trip device in a circuit breaker.

2.2 Describe how a typical thermal element trip device operates
      to trip a breaker.

2.3 Describe how a typical electromagnetic trip device operates
      to trip a breaker.

2.4 Explain how a dashpot can be used to provide a breaker with
      a time delay in tripping.

2.5 Explain how two common three-phase systems of ground
      protection for circuit breakers operate.

2.6 Explain three common breaker ratings found on a breaker
      nameplate.

Topic 3: Principles of Circuit Interruption

3.1 Explain what an arc is and how it forms between the contacts
      of a typical circuit breaker.

3.2 Explain the purpose of the main contacts and arc contacts
      commonly found on larger power breakers.

3.3 List three physical factors that help a circuit breaker to
      extinguish an arc.

3.4 Describe how an insulated fin arc chute aids in extinguishing
      an arc in a typical circuit breaker.

3.5 Describe how a metal fin arc chute aids in extinguishing an
      arc in a typical circuit breaker.

3.6 Describe the differences in breaker ratings when a breaker
      is used in a DC and in an AC circuit.

Topic 4: Switchgear

4.1 List the components of a typical switchgear assembly.

4.2 Identify and explain the purpose of each of the three sections
      in a typical switchgear assembly.

4.3 Explain the purpose of an instrumentation cubicle in the
      front section of a typical switchgear assembly.

4.4 Describe or demonstrate how a typical breaker is connected
      to primary power and to control power.

4.5 Discuss how the bus section in a typical switchgear assembly
      distributes power between the front section and the cable
      section.

4.6 Describe the various components in a cable section in a
      typical switchgear assembly.

4.7 Identify and explain the three draw-out positions a typical
      circuit breaker passes through as it is racked out of a
      switchgear cubicle- connected, test, and disconnected.

Topic 5: Preventive Maintenance

5.1 List the factors that affect the frequency of preventive
      maintenance procedures on circuit breakers and switchgear
      in your plant.

5.2 Explain facilities safety precautions with respect to performing
      maintenance on circuit breakers and switchgear.

5.3 Describe a typical rack-out procedure for a power breaker.
      explain why an operator stands to the side of a cubicle while
      racking a breaker in or out.

5.4 Describe or demonstrate the preventive maintenance procedures
      associated with arc chutes in a disassembled power breaker.

5.5 Describe or demonstrate the preventive maintenance procedures
      associated with shunt trip coils and primary and secondary
      disconnect fingers in a disassembled power breaker.

5.6 Describe or demonstrate how a typical power breaker is
      returned to service after preventive maintenance has been
      performed on it.

5.7 Describe or demonstrate the preventive maintenance procedures
      associated with molded-case circuit breakers and switchgear
      assemblies in your plant.

Topic 6: Circuit Breaker Overhaul 

6.1 Identify the protective equipment that your plant requires for
      cleaning a power breaker with compressed air and solvents.

6.2 Demonstrate how to disassemble, clean, and reassemble a
      metal fin arc chute in a typical power breaker.

6.3 Demonstrate how to disassemble, lubricate, and reassemble
      an operating mechanism in a typical power breaker.

6.4 Describe how the contacts in a typical power breaker are
      inspected for gap, wipe, and pressure.

Performance Evaluator’s Signature _______________________________

Performance Evaluator’s Name (Print) ____________________________

Date Completed: _____________________________________________