Electrical Wiring Residential
18th Edition
ISBN: 9781285170954
Author: Ray C. Mullin, Phil Simmons
Publisher: Cengage Learning
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Textbook Question
Chapter 15, Problem 16R
An electric dryer is rated at 7.5 kW and 120/240 volts, 3-wire, single-phase. The terminals on the dryer and panelboard are marked 75°C.
- a. What is the wattage rating? ___________
- b. What is the current rating? ___________
- c. What minimum size type THHN copper conductors are required? ___________
- d. If EMT is used, what minimum size is required? ___________
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1. Alternating current systems of less than _______ volts are required to be grounded if they're installed outside as overhead conductors.
A. 50 B. 100 C. 75 D. 120
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.
Training is required for:
Qualified electricians only.
Only those workers who work on or near exposed
energized parts.
Both those workers who work on or near exposed
energized parts and those who do not.
None of the above.
a.
b.
C.
d.
Workers who are designated as "unqualified:"
Do not need any training.
Must become "qualified" within one year.
a.
b.
Must not operate electrically powered equipment.
Must be trained in safety-related work practices.
C.
d.
Workers who are designated as "qualified."
Work on or near exposed energized parts.
a.
b.
Must be trained to distinguish exposed live parts from other
parts of electrical equipment.
Must be trained to determine the nominal voltage of
exposed live parts.
C.
d.
All of the above.
Protect yourself from electrical hazards by:
Leaving covers off of electrical panels to make inspection
a.
easier.
Wearing specialized personal protective equipment as
needed.
Pulling fuses instead of locking out during repairs.
d. Removing the ground prong from…
Chapter 15 Solutions
Electrical Wiring Residential
Ch. 15 - Prob. 1RCh. 15 - Prob. 2RCh. 15 - What special type of switch is controlling the...Ch. 15 - Prob. 4RCh. 15 - The total estimated volt-amperes for Circuit B10...Ch. 15 - If an attic is accessible through a scuttle hole,...Ch. 15 - Prob. 7RCh. 15 - Prob. 8RCh. 15 - The following is a layout of the lighting circuit...Ch. 15 - Prob. 10R
Ch. 15 - Prob. 11RCh. 15 - a. What is the minimum power demand allowed by the...Ch. 15 - What is the maximum permitted current rating of a...Ch. 15 - Prob. 14RCh. 15 - a. Must the metal frame of an electric clothes...Ch. 15 - An electric dryer is rated at 7.5 kW and 120/240...Ch. 15 - When a metal junction box is installed as part of...Ch. 15 - A residential air-conditioning unit is installed...Ch. 15 - The Code states that a means must be provided to...
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