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: Basic Operation

1.1  Describe how the following trip devices operate in a
typical circuit breaker: thermal element, electromagnetic,
electromagnetic with a dashpot.

1.2  Identify and describe the functions of the three sections of
a typical switchgear assembly.

Topic 2: Principles of Circuit Interuption

2.1 Describe what an arc is and how an arc forms.

2.2 Describe how speed, distance, and cooling affect
      extinguishing an arc.

2.3 Describe how a metal fin arc chute can be used to extinguish
      an arc in a typical circuit breaker.

Topic 3: Maintenance

3.1 Perform a routine maintenance procedure on a low voltage
      circuit breaker that includes

•  Racking out the breaker

• Cleaning the breaker with a rag

• Inspecting the breaker for signs of heat damage and
  loose connections

• Removing and inspecting the metal fin arc chutes

• Cycling the breaker

3.2 Perform an overhaul procedure on a low voltage circuit
      breaker that includes

Removing, cleaning, and inspecting the arc chutes

Removing, cleaning, and lubricating the breaker’s
faceplate

Checking the breaker’s wiring for loose connections

Cleaning and inspecting the contacts

Checking the primary and secondary disconnect fingers
for signs of wear

Using a slow-close handle to check the contacts for gap,
wipe, and pressure

3.3 Perform an instantaneous trip test and a time delay trip
      test on a low voltage circuit breaker.

Performance Evaluator’s Signature _______________________________

Performance Evaluator’s Name (Print) ____________________________

Date Completed: _____________________________________________