EBK ELECTRICAL WIRING RESIDENTIAL
19th Edition
ISBN: 9781337516549
Author: Simmons
Publisher: CENGAGE LEARNING - CONSIGNMENT
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Textbook Question
Chapter 24, Problem 4R
In a home, the low-voltage wiring between the thermostat and furnace is (Circle the correct answer.)
- a. Class 1.
- b. Class 2.
- c. Class 3.
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Chapter 24 Solutions
EBK ELECTRICAL WIRING RESIDENTIAL
Ch. 24 - Prob. 1RCh. 24 - Prob. 2RCh. 24 - Prob. 3RCh. 24 - In a home, the low-voltage wiring between the...Ch. 24 - Prob. 5RCh. 24 - The nameplate on a transformer will indicate...Ch. 24 - If Class 2 conductors are insulated for 150 volts,...Ch. 24 - If you use 600-volt rated conductors for Class 2...Ch. 24 - The NEC is very strict about securing anything to...Ch. 24 - Does the Code permit attaching the low-voltage...
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A certain type of control connects electric heating units to a 120-volt supply or a 240-volt supply, depending on the amount of the temperature drop in a room. These controls are supplied from a 120/240-volt, 3-wire, single-phase source. Assuming that this type of device controls a 240-volt, 2000-watt heating unit, what is the wattage produced when the control supplies 120 volts to the heating unit? Show all calculations. ______________________________________________________________________ ______________________________________________________________________
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Answer the following:
Is it acceptable by code to use switch legs that have less ampacity as the rating of the circuit?
Is it acceptable by code to use a breaker rated for less than the ampacity rating of the wires in a branch circuit?
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For residential wiring, not less than one 15-ampere lighting branch circuit should be provided for every ____________ ft2 of floor area. If 20-ampere lighting branch circuits are used, provide one 20-ampere lighting branch circuit for every ____________ ft2 of floor area
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What is the 277-volt–single-phase–60-hertz system used for?
Select one:
A. RECEPTACLE BRANCH CIRCUITS
B. LIGHTING BRANCH CIRCUITS
C. MOTOR BRANCH CIRCUITS
D. RESIDENTIAL BRANCH CIRCUITS
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QUESTION 9
When a ground wire is connected to an interior gas piping system and the underground portion of the gas pipe into the building is plastic, which of the following is (or are) true?
a
A.This would be approved by code as the gas pipe is only being bonded to the electrical system.
b
B.This installation would be approved by code, as the gas pipe is not a grounding electrode.
c
C.Both A and B
d
D.Neither A nor B
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For laundry equipment in basements, what sort of electrical circuitry is required by the Code? ________________
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May the 20-ampere small-appliance branch circuits in the kitchen of a residence also supply the lighting above the kitchen sink and under-cabinet lighting? Check the correct answer. Yes______ No ______
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What unique type of electrical protection is required for all 120-volt, single-phase, 15-and 20-ampere branch circuits in certain habitable rooms and areas in new dwellings? Where in the NEC is this requirement found? ____________________
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A residential air-conditioning unit is installed in the attic. a. Is a lighting outlet required? __________ b. What Code section applies? __________ c. If a lighting outlet is required, how shall it be controlled? __________ d. What Code section applies? __________ e. Is a receptacle outlet required? __________ f. What Code section applies? __________
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A mobile home served with 120/240 volt 3 wire service that has a calculated load greater than 50 ampere is required to be supplied power using a permanent wire method from the adjacent power supply pole to the mobile home. The power supply feeder is required to consist of?
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When used as service equipment, a panelboard (load center) must be ______________________ that is suitable for use as service equipment, 230.66. If the panelboard (load center) contains the main service disconnect, it must be clearly marked ____________________________________, 230.70(B).
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what section of the code prohibits supporting telephone wires from raceways that contain light or power conductors.
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