Electrical Wiring Residential
18th Edition
ISBN: 9781285170954
Author: Ray C. Mullin, Phil Simmons
Publisher: Cengage Learning
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Textbook Question
Chapter 32, Problem 13R
NEC 590.6(A)(3) requires that all 125-volt and 125/250-volt, single-phase, 15-, 20-, and 30-ampere receptacle outlets used on a construction site that are a part of a portable generator have listed: (Circle the correct answer.)
- a. ground-fault circuit interrupter protection for personnel.
- b. grounding-type receptacles.
- c. twist-lock receptacles.
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9. Which grounding method is typically required of higher-voltage systems? A. Grounding through inductorsB. Grounding through a low amount of resistanceC. Grounding through a high-impedance device
D. Grounding through surge arresters
10. Which term relates to the conductors connected to the output side of a separately derived system? A. Neutral conductorB. Transformer secondary conductorC. System conductor
D. Derived phased conductor
11. If there's no service disconnect at a remotely supplied building, then the grounding electrode conductor and the equipment grounding conductor can be bonded together at a
A. junction box.B. structural steel location. C. grounding electrode rod. D. water line.
12. In a DC system, the bonding jumper between the negative of the supply and ground is normally made at the source or at the
A. first disconnecting means. B. first device on the supply. C. end of the DC line.D. entrance to the building.
13. Which of the following is a common raceway…
[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 circuits
Figure 2 shows the circuit of a simple power system. The ratings of the generators,
transformers and the motors are as shown in the figure. The reactance of lines 1 and 2
are 40 ohms and 50 ohms respectively. Assume that system is unloaded, and the generators
are generating their rated voltage. Select the generator G₁ ratings as base values.
Choose the fault location in bus 1, bus 2, or bus 3.( Only one bus location)
And give this answer
For a symmetrical three phase fault on the bus
1.Draw the reactance diagram for the fault with all the reactances marked in per unit.
2.Determine the Thevenin's equivalent circuit which can be used to calculate the fault current.
(3) Calculate the fault current in ampere and fault power in MVA.
(4) Calculate the fault current contribution from the generator connected to the bus for fault calculation.
Chapter 32 Solutions
Electrical Wiring Residential
Ch. 32 - Prob. 1RCh. 32 - Where would the logical location be for running a...Ch. 32 - Prob. 3RCh. 32 - Prob. 4RCh. 32 - Prob. 5RCh. 32 - Is it permitted to ground the neutral conductor of...Ch. 32 - Briefly explain the function of a transfer switch....Ch. 32 - When a transfer switch transfers to standby power,...Ch. 32 - A typical transfer switch for residential...Ch. 32 - Prob. 10R
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- c.1. Which of the following is one of the three essential functions of an equipment grounding conductor?A. Provide an arc-fault current pathB. Establish groundingC. Establish bondingD. Ensure the system is groundedc.2. What's another name for the three-point method of Earth resistance testing?A. Fall-of-potentialB. Line surgeC. Spatial shieldingD. Leakage current c.3. If the National Electrical Code provides a requirement to ground equipment, it generally implies thatthere will be a direct connection to the Earth of a connection through a/anA. grounding electrode conductor.B. equipment grounding conductor.C. equipotential bonding conductor.D. bonding conductor.arrow_forwardThe term "____" is defined in NEC® Article 100 as "connected to establish electrical continuity and conductivity." Select one: A. BENDED (BENDING) B. BONDED (BONDING) C. SHUNTED (SHUNTING) D. GROUNDED (GROUNDING)arrow_forwardVoltage unbalance is the unbalance that occurs when the voltages at different motor terminals are not equal. This is a big problem for power companies generating, and other facilities using three phase power. If left in this condition this can cause transformer and motor windings to prematurely burn open. Using a DMM you are troubleshooting a 480 volt, 3 phase power feeding a fused disconnect connected to a 3 phase, 1 H.P. motor. Your findings are as follows: Phase A/B = 441 volts, Phase A/C = 479 volts and Phase B/C = 457 volts Find the voltage unbalance and determine if this is acceptable.arrow_forward
- a) 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_forwardExplain the significance of fault current analysis in power system protection.arrow_forward#14,#17arrow_forward
- 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.arrow_forward8.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_forward1).What factors should be considered when selecting the plug setting of an overcurrent relay. 2) Describe the principle of operation of a directional over-current relay. 3).What are the factors that should be considered when implementing a biased differential protection scheme for a star/delta transformer. Draw a single line diagram to show the connections.arrow_forward
- a) Given the concept of Circuit Breakers discuss five types of circuit breakers and their principle of operation. b) the (1 Dimensional) design of the delta connected three phase Produce faults stated under (question 2ii). c) Using the (question 1.iv) parameters solve for the reactance in per unit(pu) quantity. CR d) Show the three criteria for the selection of a cable for power system distribution network.arrow_forwardThe magnetic circuit breaker has ______ trip action. a. Instantaneous b. Short c. Delayedarrow_forwardWhy are single-phase distribution transformers made whit the low-voltage winding in two sections? A- to make two voltages available on the secondary side, B- to minimize losses, C- to provide a spare, D- none The neutral conductor on the secondary side of a single-phase 3-wire distribution transforme carries the____. A- total load current of both outside conductors. B- product of currents in both of the outside conductors, C- difference in the currents between both the outside conductors, D- none The primary purpose of a control transformer is to reduce the line ...... A- current to the value needed to operate control circuits, B- wattage to the value needed to operate control circuits, C-voltage to the value needed to operate control circuits, D- nonearrow_forward
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