Electrical Wiring: Residental - With Plans (Paperback) Package
18th Edition
ISBN: 9781305416376
Author: MULLIN
Publisher: Cengage
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Textbook Question
Chapter 28, Problem 12R
Which Code section states that all overcurrent devices must have adequate interrupting ratings for the available fault current to be interrupted? _____________________________________
___________________________________________________________________________
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12. Which of the following statements about ground faults is true?A. They can happen if a conductive tool is dropped in an energized equipment's electrical enclosure.B. They usually occur between any grounded circuit conductor and the equipment grounding conductor.C. They can't result from human error.D. They're often normal and typically intentional.
A circuit breaker is _______________________
a.
used to detect a fault
b.
has a fuse elment
c.
has 3 contacts
d.
used at low voltage only
Why is it necessary to carry out fault calculations? Compare between the p.u. system method and the referred Ohmic impedance method for fault calculations.
Chapter 28 Solutions
Electrical Wiring: Residental - With Plans (Paperback) Package
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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- 8.a. A _______ conductor does not carry current during normal operation.A. neutralB. groundingC. phaseD. grounded8.b. "The complete path of an electric current" describes an electric(al)A. fault.B. circuit.C. source.D. component.arrow_forwardQUESTION 4 a) State three each: “ DOs “ and “ DON'Ts “ associated with electrical equipment operation on board ship. b) Differentiate between open circuit fault, earth fault and short circuit fault. Which of these has the most devastating effect and why?arrow_forwardA faulty ________________________________ may cause an unintentional open circuit.arrow_forward
- And 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___________ is an Area on a device characteristic where the ratio between applied voltage and resulting current is constant.arrow_forward14. The amount of fault current that bonding connections have to endure is related to which of thefollowing?A. The quality of the fittings that were chosen for the systemB. The amount of available fault current delivered by the system or utilityC. The type of equipment and the location in the systemD. The number of connections that are part of the listed assemblyarrow_forward
- The National Electrical Code® requires that all switching be done in the __________ circuit conductor. Select one: A. GROUNDED B. SWITCH LOOP C. GROUNDING D. UNGROUNDEDarrow_forward45. A switch or circuit breaker can be used as both the controller and disconnecting means if it a. opens all ungrounded conductors as required by NEC 430.103 b. is protected by an overcurrent device in each ungrounded conductor c. is manually operable, or both power and manually operable d. All of these answersarrow_forward1. A14/2 type copper used for a general lighting branch circuit. Ampacity:______________ Maximum Fuse or Circuit Breakers Sizes:________________ 2.Three 8 AWG copper conductors with THHN insulation Installed in garage in electrical metallic tubing (EMT). The ambient temperature in the garage can reach as high as 110'F. All termination points for this circuit are rated 60'C. Ampacity:______________ Maximum Fuse or Circuit Breakers Sizes:________________ 3.Four 4 AWG copper conductor with THWN insulation imstalled in EMT in a basement. All termination points are rated at 60'C. Ampacity:______________ Maximum Fuse or Circuit Breakers Sizes:________________ 4. An 8/3 Type UF copper cable installed underground from a house to a detached garage to feed a 120/240-volt subpanel. All termination points are rated at 60'C.…arrow_forward
- 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_forwardb) Differentiate between Insulated-Neutral and Earthed-Neutral systems as applied to electrical distribution on board ship. c) Explain with sketches why it is necessary that a single ground fault in an insulated-earth distribution system must be located and cleared immediatelyarrow_forward
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