Electrical Wiring Residential
18th Edition
ISBN: 9781285170954
Author: Ray C. Mullin, Phil Simmons
Publisher: Cengage Learning
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Textbook Question
Chapter 7, Problem 15R
A good “rule-of-thumb” to estimate the expected life of a motor, a ballast, or other electrical equipment is that for every ____________ °C above rated temperature, the expected life will be cut in __________________.
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4.) Conductors that supply a single motor used in a continous duty application sall have an ampacity of __________________ of the motor's full load current rating.
a.) Not less than 300%b.) Not less than 125%C.) Not less than 250%d.) None of the above
5.) The _________ on the nameplate of motor is an indication of the overload capacity of the motor
a.) Code letterb.) Design Letterc) Insulation classd.) None of the above
6.) The __________ describes motor's ability to withstand temperature overtime
a.) Code letterb.) Design letterc.) insulation classd.) None of the above
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)
6. Ferrous metal raceways or enclosures are made with _______ content.A. brass or aluminumB. steel or brassC. aluminum or ironD. iron or steel
Chapter 7 Solutions
Electrical Wiring Residential
Ch. 7 - Is it permissible to install a recessed luminaire...Ch. 7 - If a recessed luminaire without an integral...Ch. 7 - Thermal insulation is not permitted to be...Ch. 7 - Recessed luminaires are available for installation...Ch. 7 - Unless specifically designed, all recessed...Ch. 7 - Plans require the installation of surface-mounted...Ch. 7 - A recessed luminaire bears no marking indicating...Ch. 7 - Prob. 8RCh. 7 - Additional backup protection for ballasts can be...Ch. 7 - Prob. 10R
Ch. 7 - The Code places a maximum open-circuit voltage on...Ch. 7 - The letter E in a circle on a ballast nameplate...Ch. 7 - A 120-volt lamp fluorescent ballast for two...Ch. 7 - Can an incandescent lamp dimmer be used to control...Ch. 7 - A good rule-of-thumb to estimate the expected life...Ch. 7 - A post light has a 120-volt, 60-watt lamp...Ch. 7 - Define the following terms. a. A tap conductor is...Ch. 7 - Circle the correct answer for the following...Ch. 7 - Circle the correct answer for the following...
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