EBK ELECTRICAL WIRING RESIDENTIAL
19th Edition
ISBN: 9781337516549
Author: Simmons
Publisher: CENGAGE LEARNING - CONSIGNMENT
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Chapter 28, Problem 15R
The utility company has provided a letter to the contractor stating that the available fault current at the line side of the main service-entrance equipment in a residence is 17,000 amperes RMS symmetrical, line to line. In the space following each statement, write in “Meets Code” or “Violation” of 110.9 and 110.10 of the Code.
- a. Main breaker has a 10,000-ampere interrupting rating; branch breakers have a 10,000-ampere interrupting rating. _______
- b. Main current-limiting fuse has a 200,000-ampere interrupting rating; branch breakers have a 10,000-ampere interrupting rating. The panel is marked “Series-Rated.” _______
- c. Main breaker has a 22,000-ampere interrupting rating; branch breakers have a 10,000-ampere interrupting rating. The panel is marked “Series-Connected.” _______
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Chapter 28 Solutions
EBK 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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- n a power system what happens to phase voltages for a single line-to-ground fault as fault reactance value is increased from 0pu to 2pu?arrow_forward1. Which of the following statements about equipment grounding conductors is true?A. Unacceptable equipment grounding conductors include conduit, tubing, and cable armor.B. They must be capable of withstanding the higher level of ground-fault current to perform their safety function.C. They increase voltages above ground potential on conductors and equipment enclosures during normal operation.D. When they're far from their associated circuit conductors, impedance values are kept as low as possible during ground-faultconditions.arrow_forwardWhen installing a surge arrester at the service of less than 1000 volts, the grounding conductor shall be connected to ______. the grounded service conductor the grounding electrode conductor III. the grounding electrode for the service the equipment grounding terminal in the service equipment (a.) I & II only (c.) III & IV only (b.) I & III only (d.) I, II, III or IVarrow_forward
- i) An equation for the fault current when a single-line-to-ground fault occurs ii) derive an equation for voltage under a single-line-to- ground fault condition.arrow_forwardDraw the schematic diagram of a double line to ground fault andbasic equipment of a substation.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_forward
- 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.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_forwardA telephone company operates three identical stations at differentlocations. During one-year period, the number of malfunctions reported byeach station and the causes are shown below. (a)Suppose that a malfunction was reported and it was found to be caused byother human errors. What is the probability that it came from station C (b) If a malfunction was reported because of computer malfunction, whichstation is most likely reported the malfunction?arrow_forward
- 4. What can installation records be used to determine while servicing equipment?A. Broken connectors in a cable linkB. Problems due to aging during operationC. Broken fiberD. Decreased bending radius during operationarrow_forward. T1 transformer full load current, inrush current and damage points. Customer transformer full load current, inrush current and damage points. Initial relay setting criteria (50A, 50B, 51): At the feeder breaker, the 50 A is set for the fault current at 1 km. 50 B is set for the fault current at the recloser. At the recloser, the 50 A (high set) element pickup is set for 4 times customer transformer inrush, then rounded to the nearest 50 amps primary. 50 B is set for 2 times customer transformer inrush (rounded to nearest 50 amps). The 51 element pickup for both relays is set for 55% of the customer transformer inrush, with that value rounded to the nearest 50 amps. Time dial and curve family is specified for each relay location on results sheet. Fault currents and 51 relay operating times for faults at various points in the power system F2 3/0 ASCR: (0.348 + j0.502) Ω/km, recloser at 2.5 km, total length 5 km, feeder voltage 7.20 kVarrow_forwardWhat are the problems that may encounter in advanced fault detection and diagnosis techniques for power distribution systems?arrow_forward
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