Electrical Wiring Residential
18th Edition
ISBN: 9781285170954
Author: Ray C. Mullin, Phil Simmons
Publisher: Cengage Learning
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Textbook Question
Chapter 12, Problem 13R
Where is the speed control for the range hood fan located? ______
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Give the number of times the four‑step sequence must be applied to a stepper motor to make a 100‑degree move if the motor has a 5‑degree step angle. Also, fill in the characteristics for your motor below.
Step angle ____________________
Steps per revolution ___________________
Number of rotor teeth __________________
The disconnecting means for a motor controller shall be designed so that it does not _______ automatically per NEC 430.103
A. Open
B. Close
C. Restart
D. Shutdown
29. The overload relay used to protect each motor - compressor set shall be selected to trip at NOT more than ____ of the motor-compressor rated load current. a. 125% b. 150% c. 140% d. 160%
Chapter 12 Solutions
Electrical Wiring Residential
Ch. 12 - If everything on Circuit B7 were turned on, what...Ch. 12 - From what panelboard does the kitchen lighting...Ch. 12 - How many luminaires are connected to the kitchen...Ch. 12 - What color fluorescent lamps are recommended for...Ch. 12 - a. What is the minimum number of 20-ampere...Ch. 12 - Prob. 6RCh. 12 - Prob. 7RCh. 12 - Duplex receptacles connected to the 20-ampere...Ch. 12 - Prob. 9RCh. 12 - A fundamental rule regarding the grounding of...
Ch. 12 - How many circuit conductors enter the box a. where...Ch. 12 - Prob. 12RCh. 12 - Where is the speed control for the range hood fan...Ch. 12 - Who is to furnish the range hood? _____Ch. 12 - Prob. 15RCh. 12 - Complete the wiring diagram, connecting...Ch. 12 - Each 20-ampere small-appliance branch-circuit load...Ch. 12 - a. The Code requires a minimum of two...Ch. 12 - According to 210.52, no point along the floor line...Ch. 12 - Prob. 21RCh. 12 - Electric fans produce a certain amount of noise....Ch. 12 - Prob. 23RCh. 12 - Prob. 24RCh. 12 - Prob. 25RCh. 12 - Prob. 26RCh. 12 - Prob. 27RCh. 12 - The following is a layout for the lighting circuit...
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- Branch-circuit conductors supplying a single continuous-duty motor shall have an ampacity not less than _____ rating A. 125% of the motor’s nameplate current B. 125% of the motors full-load current as determined by 430.6(a)(1) C. 125% of the motor’s full locked-rotor D. 80% of the motors full-load current.arrow_forwardA 3-phase, 15 HP, 230/460-volt motor has a nameplate FLA = 38/19. If operated at 230 volts, ___ amps of current would flow in each motor winding. Please answer in typing format please ASAP for the likearrow_forward1. The starting current of an AC motor is _____________ the rated current.arrow_forward
- Question 2 Draw the control circuit complete with referencing number and terminal number for an overhead crane according to the sequence described below: Figure 5: An overhead crane Press pushbutton S1 (N/O), motor will move forward and green pilot light H1 will turn on for 10 seconds. This is to allow the motor to reach the end limit of the crane. After the motor reaches the end of travel (indicated by the delay time durations), the motor will stop and red pilot light H2 will turn On. • The control supply for this circuit is 48Vac. Safety features must be included where: i. The motor must stop at condition the thermal overload relay tripped and an emergency button S2 is pressed. .arrow_forwardAll answers should be written in complete sentences. Calculations should be shown in detail, and Codereferences should be cited when appropriate. Unless otherwise stated, all conductors are copper type THHN, and the supply is AC. 1. What is the rated full-load current of a ¾-horsepower, 208-volt single-phase motor?arrow_forward8.a. Which of the following most accurately describes the difference between a contactor and a starter?A. A starter contains a contactor and some additional protective circuitry.B. A starter is always mounted in an enclosure.C. A starter contains reversing contacts.D. A starter is always three-phase while a contactor may be single-phase or three-phase.8.b. The main bus in a motor control center is used toA. reduce the possibility of overload with large loads.B. enclose motors within a protective shield.C. distribute power to all starters in the center.D. reduce the voltage of the plant's supply.arrow_forward
- Explain the working of induction cup relay with the help of diagram.Explain all the parts in detail with diagram.arrow_forwardAll answers should be written in complete sentences. Calculations should be shown in detail, and Codereferences should be cited when appropriate. Unless otherwise stated, all conductors are copper type THHN, and the supply is AC. 1. What size conductor would be required to supply three motors connected to a 440-volt, 3-phase branch circuit? Motor #1 is a 50-horsepower, code B induction motor;motor #2 is a 40-horsepower, code H induction motor; and motor #3 is a 50-horsepower, code J induction motor.arrow_forwardWrite a ladder program for two-motor control program, so that when the ignition switch is closed, the first engine works, and when the ignition is opened, the second engine works ? edited 4:02 AM /arrow_forward
- 7-Represent in block diagram, the control system used in automatic control of speed of a wind turbine.arrow_forwardA 230-volt, single-phase, hermetic compressor with an FLA of 21 and an LRA of 250 requires a disconnect switch with a rating of ___________ horsepower.arrow_forwardNEC Table 430.52 gives four options for selecting the maximum size motor branch-circuit, short-circuit, and ground-fault protective devices. These options are listed in problems 8, 9, 10, and 11. For each option, determine the correct rating or setting for a 25-horsepower, 3-phase, 230-volt motor. The motor is marked “Design B.” 8.Non-time-delay fuses: 9..Dual-element, time-delay fuses: 10.Instantaneous-trip breakers: 11.Inverse time breakers:arrow_forward
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