Electrical Wiring Residential
18th Edition
ISBN: 9781285170954
Author: Ray C. Mullin, Phil Simmons
Publisher: Cengage Learning
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Textbook Question
Chapter 17, Problem 2R
The junction box that will be installed above the dropped ceiling near the fluorescent luminaires closest to the stairway will have ____________ (number of) 14 AWG conductors.
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In order to wire a post light, a homeowner purchased some single-conductor cable that was marked as suitable for direct burial in the ground. A separate equipment grounding conductor to the post light was not carried. Instead, the bottom of the metal post, buried 2 ft (0.6 m) into the ground, was used as a ground for the post light. The inspector “red tagged” (turned down) the installation. Who is right—the homeowner or the electrical inspector?
Explain.
Equipment Grounding
13. A metal elbow is a part of a nonmetallic, underground raceway. The elbow won't need to be grounded as long as it's encased in at least _______ inches of concrete.
A. 4 B. 5 C. 2 D. 6
13 A. Which of the following can be in the form of a wire and is required to be installed with feeders and branch circuits?
A. Phased neutral conductorB. Equipment grounding conductor C. Grounded neutral conductorD. Grounding electrode conductor
Assignment on Threaded jointsDue date:__________________ ___________________ ________________ Surname Given names IDA power line tower is erected to support a high-voltage power line (see figure below),which includes six phase conductors and three Earth shield wires. The tower isfabricated as a steel structure resting on four square supporting feet bolted to aconcrete foundation with four Anker bolts at each support (see figure below). Theresultant tension force FT from cables on each side of the tower is applied at point m,and can be at 60o to the horizontal plane (sagging downwards) if the tower is installedon a plane or at 30o to the horizontal plane pointed upwards if the tower is installed on ahilly landscape. The gusty wind load, which could be represented with a resultant forceof Fw is applied at the geometric centre of the tower n in any direction in the horizontalplane (see figure below) and tends to shift the tower sideways and topple it. In the caseof an accident when all…
Chapter 17 Solutions
Electrical Wiring Residential
Ch. 17 - What is the total current draw when all six...Ch. 17 - The junction box that will be installed above the...Ch. 17 - Why is it important that the hot conductor in a...Ch. 17 - In the diagram, Load A is rated at 10 amperes, 120...Ch. 17 - Calculate the watts loss and voltage drop in each...Ch. 17 - Unless specifically designed, all recessed...Ch. 17 - Where in the NEC would you look for the...Ch. 17 - What is the current draw of the recessed...Ch. 17 - Prob. 9RCh. 17 - Calculate the total current draw for Circuit B9,...
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- The recessed fluorescent luminaires installed in the ceiling of the recreation room of this residence are connected with trade size flexible metal conduit. These flexible connections are commonly referred to as fixture whips. Does the flexible metal conduit provide adequate grounding for the luminaires, or must a separate equipment grounding conductor be installed? ________________arrow_forwardQUESTION 8 We are running 3 wires in an IMC to a control panel with a 150 amp circuit breaker disconnect in the control panel. The conduit is run 12 inches above the roof on a strut rack. The ambient air temperature is 88 degrees. This control panel feeds the #1 cooling fan. What sized ungrounded conductors do we need? All conductors have typeTHHN insulation.arrow_forwardEquipment grounding conductors that are permitted to be used to ground luminaires are found in NEC _______ ?arrow_forward
- 12.a. FMC and LFMC wiring methods are permitted to be used for service-entrance conductors in lengths ofup toA. 12 feet.B. 9 feet.C. 6 feet.D. 3 feet. 12.b. The NEC states that service-drop conductors with voltage limited to 300 volts to ground shall have aminimum of _______ feet vertical clearance from final grade over residential property, driveways, andthose commercial areas not subject to truck traffic.A. 12B. 20C. 15D. 18arrow_forwardQUESTION 3 We are running 3 wires and a ground in a RMC to a control panel with a 60 amp circuit breaker disconnect in the control panel. The conduit is run along the ceiling where the ambient air temperature is 100 degrees. The control panel feeds our secondary cooling pump. What size are the ungrounded conductors? All conductors have typeTHHN insulation.arrow_forwardThe coloring on individual conducting wires usually does not indicate a size or rating but rather the standard or preferred use of the wire. For example, black and red wires typically are used for currentcarrying or "hot" connections, and ___ wires usually are grounded "neutral" conductors. Green-insulated wires and bare copper wires are used for grounding wires.arrow_forward
- A branch circuit conists of five conveniance outlets. Determine the size of the conductor to be used to the said branch circuit. Plrase indicate the type of conductors to be usedarrow_forwardL1. Boxes are classified by type, construction, andA. installation location.B. luminaire support capability.C. number of knockouts.D. power rating L2. Which of the following devices must be placed at each end of an armored cable to prevent damage tothe conductors?A. An insulating sliderB. An insertion couplingC. An antishort bushingD. A metal loop fitting L3. Which of the following is the maximum cross-sectional conductor fill area for underfloor raceways?A. 50%B. 60%C. 40%D. 30%arrow_forwardIt is measure of how much counter emf is generated in a circuit. ________arrow_forward
- When connecting a multiwire (3-wire) circuit to a single phase panel, one ungrounded conductor must be connected to the ____ phase and the other ungrounded conductor must be connected to the ____ phase. Select one: a. A, A b. B, B c. A, B d. doesn’t matterarrow_forwardHow many circuit conductors enter the box a. where the range hood will be installed? _________________ b. in the ceiling box over which the track will be installed? _________________ c. at the switch location to the right of the sliding door? _________________arrow_forwarda. Does the circuit for the Master Bedroom have a grounded circuit conductor? ____________________ b. Does it have an equipment grounding conductor? ____________________ c. Explain the difference between a grounded conductor and an equipment grounding conductor. ____________________ ____________________arrow_forward
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