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ELECTRICAL WIRING:RESIDENT.-TEXT (PB)
19th Edition
ISBN: 9781337116213
Author: MULLIN
Publisher: CENGAGE L
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Chapter 2.1, Problem 19R
a.
To determine
Explain about an offset bar hanger.
b.
To determine
Mention the types of boxes that can be mounted using offset bar hangers.
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Answer problems 10, 11, and 12 using the following information:An addition is being planned to a school building. You have been asked to determine theload that will be added to the panelboard that will serve this addition.The addition will be a building 80 ft 3 50 ft. It will consist of four classrooms, every40 ft 3 20 ft and a corridor that is 10-ft wide
The following loads will be installed:Each classroom:12 fluorescent luminaires, 2 ft 3 4 ft @ 85 VA each20 duplex receptaclesAC unit, 208-volt, 1-phase @ 5000 VACorridor:5 fluorescent luminaires, 1 ft 3 8 ft @ 85 VA each8 duplex receptaclesExterior:4 wall-mounted luminaires @ 125 VA each4 duplex receptacles
10. The calculated load is__________ VA.11. The connected load is__________ VA.12. The neutral load is_____________ VA.
A 1200-ampere service was installed, consisting of three sets of 600 kcmil THHN/THWN copper conductors per phase. The electrical contractor was careful to cut theconductors the same length. When the utility crew made up the connections at theservice heads, they cut the conductors to different lengths to make their connectionssimpler. The actual lengths of the service-entrance conductors in a given phase ended up being20 ft (6.1 m), 22 ft (6.7 m), and 24 ft (7.3 m). The maximum ampacity of a 600-kcmilTHHN/THWN copper conductor is 420 amperes using the 75°C column of Table310.16. This is more than adequate for the calculated 1200 amperes when three conductors are run in parallel. Determine how the load of 1200 amperes would divide in each of the three paralleledconductors in a phase.
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Chapter 2 Solutions
ELECTRICAL WIRING:RESIDENT.-TEXT (PB)
Ch. 2.1 - What is the purpose of specifications?Ch. 2.1 - Refer to the specifications in the back of this...Ch. 2.1 - What is done to prevent a plan from becoming...Ch. 2.1 - Name three requirements contained in the...Ch. 2.1 - Prob. 5RCh. 2.1 - What phrase is used when a substitution is...Ch. 2.1 - What is the purpose of an electrical symbol?...Ch. 2.1 - Prob. 8RCh. 2.1 - Prob. 9RCh. 2.1 - What three parties must be satisfied with the...
Ch. 2.1 - What does a plan show about electrical outlets?...Ch. 2.1 - Prob. 13RCh. 2.1 - Prob. 14RCh. 2.1 - Prob. 15RCh. 2.1 - Prob. 16RCh. 2.1 - Prob. 17RCh. 2.1 - Prob. 18RCh. 2.1 - Prob. 19RCh. 2.1 - What methods may be used to mount luminaries to an...Ch. 2.1 - What advantage does a 4 in. octagon box have over...Ch. 2.1 - What is the size of the opening of a switch...Ch. 2.1 - Prob. 23RCh. 2.1 - Prob. 24RCh. 2.1 - Prob. 25RCh. 2.1 - Prob. 26RCh. 2.1 - Prob. 27RCh. 2.1 - Prob. 28RCh. 2.1 - Prob. 29RCh. 2.1 - Prob. 30RCh. 2.1 - Prob. 31RCh. 2.1 - Prob. 32RCh. 2.1 - Prob. 33RCh. 2.1 - Prob. 35RCh. 2.1 - Prob. 37RCh. 2.1 - Prob. 38RCh. 2.1 - Prob. 39RCh. 2.1 - Prob. 40RCh. 2.1 - Prob. 42RCh. 2.1 - Does the NEC allow metal raceways to be used with...Ch. 2.2 - Prob. 1RCh. 2.2 - What is the size of the footing for the steel...Ch. 2.2 - Prob. 3RCh. 2.2 - Prob. 4RCh. 2.2 - Prob. 5RCh. 2.2 - Prob. 6RCh. 2.2 - How far is the front garage wall from the curb?...Ch. 2.2 - How far is the side garage wall from the property...Ch. 2.2 - Prob. 9RCh. 2.2 - What is the purpose of the I-beams that rest on...Ch. 2.2 - Where is access to the attic provided?...Ch. 2.2 - Prob. 13RCh. 2.2 - Prob. 14RCh. 2.2 - Prob. 15RCh. 2.2 - Prob. 16RCh. 2.2 - What is the stud size for the partitions between...Ch. 2.2 - Who is to furnish the range hood?...Ch. 2.2 - Who is to install the range hood?...
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