Electrical Wiring Residential
18th Edition
ISBN: 9781285170954
Author: Ray C. Mullin, Phil Simmons
Publisher: Cengage Learning
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Chapter 30, Problem 12R
To determine
Choose the correct option from the given statement for the enclosures of transformers and GFCIs and junction boxes having one thing in common.
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The 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)
Refer to the National Electrical Code or the working drawings when necessary. Whereapplicable, responses should be written in complete sentences.A 300-kilovolt-ampere transformer bank consisting of three 100-kilovolt-amperetransformers has a 3-phase, 480-volt delta primary and a 120/240-volt, 3-phase, 4-wiredelta-connected secondary.For problems 1 through 4 show calculations and/or source of information.
1. Sketch the secondary connections, and indicate where a 120-volt load couldbe connected.
[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
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- What two types of chime transformers for Class 2 systems are listed by UL? ___________________________ ___________________________arrow_forwardh.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.arrow_forwardDistribution transformers are generally protected from damage due to excessive internal temperatures, by the operation of a A. lightning arrester. B. surge diverter. C. flexible baffle. D. circuit breaker.arrow_forward
- Estimate the length of conduit to perform the next bends. EMT will be bend using a hand bender. Provide your answer in inches (just the number) using up to 2 decimals. The picture shows two panels connected by a back-to-back 23.5" stubs EMT 3/4" 6.25 ft Parrow_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_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_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_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_forwardIf the transformer section of the unit substation is to be given a megohmmeter test, the line connection to the_must be disconnected during the test to prevent a false ground reading A. Pothead b. Lighting arrester c. High- voltage fuse d. High - voltage winding.arrow_forward
- The nameplate on a transformer will indicate whether or not it is a Class 2 transformer. (True) (False) (Circle the correct answer.)arrow_forwardMSQarrow_forwardQ13/ choose the correct answer A transformer with full load voltage of 223 volts, when the regulation is 4%. The no load voltage will be _____________________________ V. A- 227.46 B- 111.50 C- 231.92 D-148.67arrow_forward
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