Electrical Wiring Residential
19th Edition
ISBN: 9781337101837
Author: Ray C. Mullin, Phil Simmons
Publisher: Cengage Learning
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Chapter 28, Problem 13R
All electrical components have some sort of “withstand rating.” The NEC and UL Standards refer to this as the component’s short-circuit current rating. This rating indicates the ability of the component to withstand a specified amount of fault current for the time it takes the overcurrent device upstream of the component to open the circuit. NEC _____ refers to short-circuit current rating.
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Chapter 28 Solutions
Electrical Wiring Residential
Ch. 28 - What is the minimum size service for a one-family...Ch. 28 - Prob. 2RCh. 28 - Prob. 3RCh. 28 - Prob. 4RCh. 28 - Prob. 5RCh. 28 - Prob. 6RCh. 28 - Prob. 7RCh. 28 - List the standard sizes of fuses and circuit...Ch. 28 - Prob. 9RCh. 28 - Using the method shown in this unit, what is the...
Ch. 28 - State four possible combinations of service...Ch. 28 - Which Code section states that all overcurrent...Ch. 28 - All electrical components have some sort of...Ch. 28 - Arc-fault damage is closely related to the value...Ch. 28 - The utility company has provided a letter to the...Ch. 28 - While working on the main panelboard that is...Ch. 28 - Repeat problem 16 for a main service panel that...Ch. 28 - NEC ______________________________ generally...Ch. 28 - Prob. 19RCh. 28 - Prob. 20RCh. 28 - Overcurrent devices must be accessible. (True)...
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- Which term is synonymous with short-circuit current rating? A. Fuse rating b. Fault rating c. Withstand rating d. Breaker ratingarrow_forward25) What is the type of electrical fault shown in the diagram : XA) Phase to phase to ground. (B) Phase to ground. (C) Three phase short circuit. (D) Single Phase to phase.arrow_forwardEquipment Grounding 10. Which of the following statements about ground faults is true?A. They usually occur between any grounded circuit conductor and the equipment grounding conductor. B. They're often normal and typically intentional.C. They can't result from human error.D. They can happen if a conductive tool is dropped in an energized equipment's electrical enclosure.arrow_forward
- [Fill-in-the-blank] in dwelling units shall supply only loads within that dwelling unit or no loads associated only with that dwelling unit. Select one: a. None of these b. Ground-fault protection c. Service-entrance conductors d. Branch circuitsarrow_forwarda) Classify the four categories of 3 phase power system faults we experience in our electrical power industry. b) Explain the emergence of such power systems fault as required in (question 1a)? c) Point out each type of fault specified under (a). d) Produce the (1D) design of the three-phase star connected faults stated under(b)arrow_forwardAnd interrupting rating is a/an_____rating, which is a measure of the fuses or circuit breakers ability to safely open in electrical circuit under fault conditions. A. Recommended b. Maximum c. Minimum d. Averagearrow_forward
- X.a- 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.arrow_forwardTrue False Bonding must be accomplished around conduit connections whenever the fault current return path is suspect as well as when specifically required by the NECarrow_forwardMention the faults that can occur on the CT/PT, Switchgear, Overhead lines and underground lines.arrow_forward
- A situation known as ____ occurs when a fault on a branch circuit opens not only the branch-circuit overcurrent device but also the feeder overcurrent device.arrow_forwardIn its simplest form, ____ completes a path through which fault current can flow. Select one: A. GROUNDING B. SHUNTING C. BONDING D. BENDINGarrow_forwardFrom the Fault Tree diagram, please describe how to describe the failure alarm diagram shown.arrow_forward
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