EBK ELECTRICAL WIRING RESIDENTIAL
EBK ELECTRICAL WIRING RESIDENTIAL
19th Edition
ISBN: 9781337516549
Author: Simmons
Publisher: CENGAGE LEARNING - CONSIGNMENT
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Chapter 28, Problem 16R

While working on the main panelboard that is energized, the electrician inadvertently causes a direct short circuit (line to ground) on one of the branch-circuit breakers. The available fault current at the main service equipment is rather high. The panelboard is labelled “Series-Connected.” The main breaker is rated 100 amperes. Both branch-circuit breaker and main breaker trip OFF. This condition is referred to as being (selective) (nonselective). (Circle the correct answer.)

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Which term is synonymous with short-circuit current rating?                                                      A. Fuse rating b. Fault rating c. Withstand rating d. Breaker rating
h.1. In an alternating-current system, the maximum size for a copper grounding electrode conductor isA. 250 kcmil.B. 3/0.C. 500 kcmil.D. 4/0. h.2. The figure shows a fault condition in an ungrounded electrical system. Which of the following will occurbecause of the fault in this system?A. Only the overcurrent protector at Point A will trip open.B. The ground fault will heavily damage the service.C. Nothing will happen until a second ground fault occurs.D. The overcurrent protection will trip, shutting off all the line side power.
Explain the concept of a circuit breaker in electrical power systems and its role in protecting against overcurrent faults.
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