Electrical Wiring Residential
18th Edition
ISBN: 9781285170954
Author: Ray C. Mullin, Phil Simmons
Publisher: Cengage Learning
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Textbook Question
Chapter 15, Problem 12R
- a. What is the minimum power demand allowed by the Code for an electric dryer if no actual rating is available for the purpose of calculating feeder and service-entrance conductor sizing? ______________
- b. What is the current draw? _____________________
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Chapter 15 Solutions
Electrical Wiring Residential
Ch. 15 - Prob. 1RCh. 15 - Prob. 2RCh. 15 - What special type of switch is controlling the...Ch. 15 - Prob. 4RCh. 15 - The total estimated volt-amperes for Circuit B10...Ch. 15 - If an attic is accessible through a scuttle hole,...Ch. 15 - Prob. 7RCh. 15 - Prob. 8RCh. 15 - The following is a layout of the lighting circuit...Ch. 15 - Prob. 10R
Ch. 15 - Prob. 11RCh. 15 - a. What is the minimum power demand allowed by the...Ch. 15 - What is the maximum permitted current rating of a...Ch. 15 - Prob. 14RCh. 15 - a. Must the metal frame of an electric clothes...Ch. 15 - An electric dryer is rated at 7.5 kW and 120/240...Ch. 15 - When a metal junction box is installed as part of...Ch. 15 - A residential air-conditioning unit is installed...Ch. 15 - The Code states that a means must be provided to...
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- ____ current occurs when the system neutral is grounded improperly downstream from the service equipment. Select one: A. PHASED B. OBJECTIONABLE C. POSITIVE D. NEGATIVEarrow_forward- Loads, Service, and Overcurrent Protection 6.a. The general lighting load is based on a _______ per square foot basis.A. kilowattB. number of circuitsC. volt-ampereD. general illumination6.b. What's the primary disadvantage of using copper conductors?A. AvailabilityB. WeightC. CostD. Durabilityarrow_forwardequipment grounding 1. The only exception to the need for all information technology equipment to be satisfactorily grounded is where the equipment is A. DC powered.B. backup generator powered. C. double-insulated.D. isolated equipment. 2. Which section of the National Electrical Code lists sizing requirements for wire-type equipment grounding conductors? A. 250.66 B. 250.118 C. 250.4 D. 250.122arrow_forward
- 4.a. The ___ calculated load is rarely placed on an electrical system.A. optionalB. standardC. total 4.b. What's the primary disadvantage of using copper conductors?A. CostB. AvailabilityC. Weight 4.c. You're evaluating the components of a multioccupancy building that won't have an on-site employee. Tobe compliant with the NEC, each occupant will need to have access to their ownA. service-disconnecting means.B. service conductor.C. cable attachment point.D. emergency fire water-pump disconnect.arrow_forward1.a. Section 300.15(C) requires a fitting to be installed on each end of a conduit or tubing being used toprovide support or protection to protect the cable fromA. hazardous vapors.B. direct sunlight.C. abrasion.D. extreme heat or cold.1.b. Typically, a/an _______ is a better electrode than a ground rod because it provides a greater surface areafrom which the electrons can be dissipated.A. continuous grounding conductorB. clamp-on ground resistance meterC. rebarD. OCPDarrow_forwardWhich of the following statements about equipment grounding conductors (EGCS) is true? A. The National Electrical Code permits the EGC to also perform as a grounding electrode conductor. B. More than one EGC must be used if multiple circuits are installed in a single raceway, cable, or cable tray. C. No current should be present in the EGC during normal operation. D. EGCs are required to be decreased in size to address voltage drop.arrow_forward
- 1. Alternating current systems of less than _______ volts are required to be grounded if they're installed outside as overhead conductors. A. 50 B. 100 C. 75 D. 120arrow_forward13.a. What does Section 230.10 prohibit the use of for the support of overhead service conductors?A. Balcony railingsB. Trees and other types of vegetationC. Wooden fencingD. Lampposts 13.b. Section 230.6 establishes five conditions under which conductors can be physically located within abuilding or structure but can be considered _______ for the purposes of applying the Code requirements.A. protectedB. enabledC. chargedD. outsidearrow_forwardA 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_forward
- Equipment Grounding 10. Which of the following statements about ground faults is true?A. They usually occur between any grounded circuit conductor and the equipment grounding conductor. B. They're often normal and typically intentional.C. They can't result from human error.D. They can happen if a conductive tool is dropped in an energized equipment's electrical enclosure.arrow_forwardQUESTION 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_forward1. 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…arrow_forward
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