Maricopa Community Colleges  ABC132   20034-20045 
Official Course Description: MCCCD Approval: 03/25/03
ABC132 20034-20045 LEC 1 Credit(s) 1 Period(s)
Circuit Breakers and Fuses
National Electrical Code (NEC) requirements, Ground Fault Circuit Interrupters (GFCI), overcurrents, fuse sizing, safety techniques and short-circuit calculations. Prerequisites: Registered Apprentice status or permission of the apprenticeship coordinator.
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MCCCD Official Course Competencies:
 
ABC132   20034-20045 Circuit Breakers and Fuses
1. List specific overcurrent protection devices and explain the necessity for electrical circuits. (I)
2. List and define the terms associated with fuses and circuit breakers. (II)
3. Explain how circuit breakers are rated. (III)
4. Identify National Electrical Code (NEC) labeling requirements and NEC's role in specifying overcurrent devices. (IV)
5. Explain how Ground-Fault Circuit Protection saves lives. (V)
6. Explain the importance of fuses as overcurrent protection devices. (VI)
7. Describe the types of overcurrents and how they occur. (VII)
8. Explain specific guidelines for sizing fuses for circuits on conventional systems. (VIII)
9. Describe safety techniques for working with overcurrent devices. (IX)
10. Calculate specific short-circuit currents. (X)
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MCCCD Official Course Outline:
 
ABC132   20034-20045 Circuit Breakers and Fuses
    I. Overcurrent Protective Devices
        A. Circuit Breakers
        B. Fuses
      II. Trade Terminology
          A. Cartridge fuse
          B. Plug Fuse
          C. Circuit breaker
          D. Fuse link
          E. Renewable fuse link
          F. Ground fault
          G. Short circuit
          H. Other
        III. Circuit Breaker Ratings
            A. Current rating
            B. Interrupting capacity rating
              1. Standard interrupting capacity
              2. High interrupting capacity
              3. Current limiting circuit breakers
          IV. NEC Labeling Requirements/Regulations and Roles
              A. Section 110-22
              B. Section 240-83
              C. Section 110-3(b)
              D. Section 110-9
              E. Section 230-65
              F. Section 240-11
              G. Section 240-83(c)
              H. Section 240-83(e)
            V. Ground-Fault Circuit Protection
                A. Types
                  1. Feed-through
                  2. Nonfeed-through
                B. Installation
                C. Purpose
              VI. Fuses
                  A. Ratings
                    1. Voltage
                    2. Ampere
                    3. Time delay
                  B. Types
                    1. Plug
                    2. Cartridge
                  C. Fuse markings
                  D. Underwriter's Laboratories (UL) fuse classes
                    1. H
                    2. K
                    3. G
                    4. J
                    5. R
                    6. T
                    7. CC
                    8. L
                  E. Operation
                VII. Overcurrents
                    A. Types
                      1. Overload
                      2. Short-circuit
                    B. Causes
                  VIII. Fuse Sizing-Conventional Systems
                      A. Dual-element time-delay fuses
                        1. Main service
                        2. Feeder circuits
                        3. Branch circuits
                      B. Non-time-delay fuses
                        1. Main service
                        2. Feeder circuits
                        3. Branch circuits
                      C. Coordination
                    IX. Safety
                      X. Short-Circuit Calculations
                          A. Basic short-circuit calculation procedure
                          B. Practical application
                          C. Peak let-through charts
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