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Official Course
Description: MCCCD Approval: 6-22-2004 |
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ABC132
2004 Fall – 2011 Summer II |
LEC
0.5 Credit(s) 0.5 Period(s) 0.5 Load Occ |
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Circuit
Breakers and Fuses |
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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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Go to Competencies Go to Outline
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MCCCD
Official Course Competencies: |
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ABC132 2004
Fall – 2011 Summer II |
Circuit Breakers and Fuses |
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1.
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List specific overcurrent
protection devices and explain the necessity for electrical circuits. (I) |
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2.
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List and define the terms associated with fuses and
circuit breakers. (II) |
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3.
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Explain how circuit breakers are rated. (III) |
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4.
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Identify National Electrical Code (NEC) labeling
requirements and NEC's role in specifying overcurrent
devices. (IV) |
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5.
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Explain how Ground-Fault Circuit Protection saves lives.
(V) |
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6.
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Explain the importance of fuses as overcurrent
protection devices. (VI) |
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7.
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Describe the types of overcurrents
and how they occur. (VII) |
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8.
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Explain specific guidelines for sizing fuses for circuits
on conventional systems. (VIII) |
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9.
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Describe safety techniques for working with overcurrent devices. (IX) |
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10.
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Calculate specific short-circuit currents. (X) |
Go to Description Go to top of
Competencies
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MCCCD
Official Course Outline: |
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ABC132 2004
Fall – 2011 Summer II |
Circuit Breakers and Fuses |
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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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