Electrical Wiring Residential
18th Edition
ISBN: 9781285170954
Author: Ray C. Mullin, Phil Simmons
Publisher: Cengage Learning
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Chapter 21.2, Problem 2R
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6.a. Extreme _______ may cause some nonmetallic conduits to become brittle and therefore moresusceptible to damage from physical contact.A. coldB. corrosionC. voltageD. heat6.b. Snap switches are permitted to be grouped or ganged in an enclosure provided the voltage between theadjacent snap switches does not exceed ___ V.A. 400B. 300C. 200D. 100
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1. Electric utility installations and equipment under the exclusive control of the utility donot have to conform to the National Electrical Code. However, they do have to conform to the .
2. Assume you are an electrical apprentice. The electrical foreman on the job tells youto connect some equipment grounding conductors to the ground bus that runs alongthe front bottom of a dead-front switchboard. The system is 480Y/277-volt solidlygrounded wye. The building is still under construction, and a number of other tradesare working in the building. The switchboard has already been energized, and it istotally enclosed except for two access covers near the front bottom where the groundbus runs. The ground bus already has the proper number of and size of lugs for theequipment grounding conductors. You ask permission to turn off the main power sothat you can work on connecting the equipment grounding conductors to the groundbus without having to worry about accidentally touching the phase buses…
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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 Barrow_forwardB.a. The metal halide lamp is designed for a specific operating position. Which one of the following is not an acceptable operating position?A. HorizontalB. A 45 degree tiltC. Vertical base upD. Vertical base downB.b. SP35 is part of the fluorescent lamp ordering code. It means that the lamp has a color temperature ofA. 35°KB. 35°FC. 350°FD. 3500°KB.c. A typical application for a compact fluorescent lamp would be in a(n)A. industrial fixture of a warehouse.B. 15-foot high ceiling of a hotel.C. recessed downlight of a kitchen.D. parking lot fixture.arrow_forwardFour electricians are discussing wiring under raised floors in information technology equipment rooms. Electrician A says that wiring under the raised floor requires fire-resistant walls, floors, and ceilings between other occupancies. Electrician B says that wiring under the raised floor requires fire resistant halfway up the walls and floors between other occupancies. Electrician C says that the room must employ a disconnecting means that removes half of the power to all equipment in the room. Electrician D says that a disconnecting means isn't necessary for the room. Which of the following statements is correct? A. Electrician B is correct. B. Electrician D is correct. C. Electrician A is correct. D. Electrician C is correct.arrow_forward
- A device used in kitchen serving hotels dining rooms club houses and restaurants is__________. a.) Grease basin b.) Yard basin c.) Garage basin d.) Oil catch basinarrow_forwardIf a recessed luminary without an integral junction boxes installed what extra wiring must be providedarrow_forward3.a. Of the following, the electrical equipment that usually requires the most power to operate is theA. clothes washer.B. water heater.C. central air conditioner.D. range.3.b. What is one advantage of using a metallic outlet box instead of a nonmetallic one?A. Metallic outlet boxes are less expensiveB. Metallic outlet boxes are easier to work withC. Metallic outlet boxes come in more sizesD. Metallic outlet boxes are gangablearrow_forward
- a. What circuit supplies the workshop lighting? ________________ b. What circuit supplies the plug-in strip over the workbench? ________________ c. What circuit supplies the freezer receptacle? ________________arrow_forwardYou are an electrician working in an industrial plant. The company is constructing a maintenance shop located 225 feet from the main plant electrical system. You are to install a 400-ampere three-phase wire system in the new maintenance shop. The service is supplied by the existing plant service. The voltage is 480 volts and the voltage drop is to be kept at 3% or below at full load. The conductors are to be aluminum. Determine the wire size needed for the 400-ampere service in accordance with the National Electrical Code. Assume that the conductors have type THWH insulation. (Note: As a general rule, for each 100 feet of conductor length the wire size is increased one standard size because of voltage drop.)arrow_forward4.a. The minimum size service disconnect for a single-family dwelling isA. 200 A.B. 100 A.C. 60 A.D. 150 A.4.b. A single piece of equipment consisting of four or more receptacles must be calculated at not less than___ VA per receptacle.A. 90B. 24C. 12D. 50arrow_forward
- Multiple choicesarrow_forward4.A. The insulation color of a grounded wire should beA. white.B. red.C. black. 4.B. A switch is always installed in a circuit so that it's connected to theA. grounding wire.B. ungrounded conductor.C. neutral wire.arrow_forward5. When seeking to measure the voltage of a wall outlet (120 Volts AC) an electie: needs to do the following to prepare the Simpson 260 meter for measurement an the words to make the following statements correct). a. Set the function switch to b. The black lead should be inserted in the jack. c. The red lead should be inserted in the jack. d. The range switch should be set to the position. Note the safety warning at the heading of Section 4.10. The Simpson folks are serious about this and so should we all be. 150 assign_ELTE108_Handout_Lab_02_2020-02-05 Page 4 of 12arrow_forward
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