Electrical Wiring Residential
18th Edition
ISBN: 9781285170954
Author: Ray C. Mullin, Phil Simmons
Publisher: Cengage Learning
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Textbook Question
Chapter 27, Problem 9R
What are the minimum distances or clearances for the following?
- a. Overhead service conductor clearance over private driveway _____________
- b. Overhead service conductor clearance over private sidewalks _____________
- c. Overhead service conductor clearance over alleys ______________________________
- d. Overhead service conductor clearance over a roof having a roof pitch of not less than 4/12. (Voltage between conductors does not exceed 300 volts.) _______________
- e. Overhead service conductor horizontal clearance from a porch _______________
- f. Overhead service conductor clearance from a fence that can be climbed on _________
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1.A. When a grounding electrode conductor is connected to the grounded conductor within a serviceequipment enclosure, it's required to be connected to the _______ terminal bus.A. service bonding jumperB. equipment groundingC. grounded conductorD. main bonding jumper1.B. The grounding electrode conductor for a DC system will have that conductor sized no smaller than_______ AWG aluminum.A. 8B. 6C. 10D. 121.C. What are the two key aspects of the installation of the grounding electrode conductor?A. Sizing and protectionB. Bonding and accessibilityC. Materials and placementD. Location and safety
11. Specific rules apply for the installation of _______, but no identification requirements for them exists.A. grounding electrode conductorsB. grounding electrodes.C. main bonding jumpers.D. equipment grounding conductors.
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. 250.122
3. Which of the following statements about grounding electrical equipment is true?A. If no wire-type equipment grounding conductors are present with the branch circuits, the equipment grounding terminal bar
isn't required.B. Grounding electrical equipment increases the possibility of metal parts remaining energized.C. The nonmetal parts of some electrical equipment are required to be connected to an equipment grounding conductor. D. Equipment grounding conductors can be spliced together outside of a grounded metal box.
4. Which of the following is a condition that must be met in order to qualify for the exemption…
Chapter 27 Solutions
Electrical Wiring Residential
Ch. 27 - Define the Service Point. ______________Ch. 27 - Define service-drop conductors.Ch. 27 - Prob. 3RCh. 27 - a. The service head must be located (above)...Ch. 27 - Prob. 5RCh. 27 - When a conduit is extended through a roof, must it...Ch. 27 - a. What size and type of conductors are installed...Ch. 27 - How and where is the grounding electrode conductor...Ch. 27 - What are the minimum distances or clearances for...Ch. 27 - What are the minimum size ungrounded conductors...
Ch. 27 - What is the minimum size copper grounding...Ch. 27 - What is the recommended height of a meter socket...Ch. 27 - Prob. 13RCh. 27 - Prob. 14RCh. 27 - Prob. 15RCh. 27 - Prob. 16RCh. 27 - Prob. 17RCh. 27 - Prob. 18RCh. 27 - Prob. 19RCh. 27 - Prob. 20RCh. 27 - Prob. 21RCh. 27 - Prob. 22RCh. 27 - Prob. 23RCh. 27 - Prob. 24RCh. 27 - Prob. 25RCh. 27 - Prob. 26RCh. 27 - Prob. 27RCh. 27 - Prob. 28RCh. 27 - Prob. 29RCh. 27 - Prob. 30RCh. 27 - Prob. 31RCh. 27 - Prob. 32RCh. 27 - Prob. 33RCh. 27 - Prob. 34RCh. 27 - Prob. 35RCh. 27 - Prob. 36RCh. 27 - Prob. 37RCh. 27 - Prob. 38RCh. 27 - Prob. 39RCh. 27 - Prob. 40RCh. 27 - Prob. 42RCh. 27 - Prob. 43RCh. 27 - Prob. 44RCh. 27 - Prob. 45RCh. 27 - Prob. 46RCh. 27 - Prob. 47RCh. 27 - Prob. 48R
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, electrical-engineering and related others by exploring similar questions and additional content below.Similar questions
- equipment 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_forwardTo interconnect grounding electrode and form grounding electrode system, connect the________ to a busbar. A. Neutral Disconnect link and their grounding electrode conductor B. Grounding electrode conductor and their bond jumpers C. Bounding jumpers and their equipment grounding conductors D. Equipment grounding conductors and their neutral Disconnect linkarrow_forwardService-lateral conductors are required to be insulated except for the grounded neutral conductor when it is___. A. Bare copper used in a raceway B. Bare copper & part of a cable assembly that is identified for ground use C. copper-clad Aluminum D. A or Barrow_forward
- 14. How many separate equipment grounding paths are required for branch circuits serving patient care spaces? A. One B. Two C. Four D. Threearrow_forward1. Which of the following statements about equipment grounding conductors is true?A. Unacceptable equipment grounding conductors include conduit, tubing, and cable armor.B. They must be capable of withstanding the higher level of ground-fault current to perform their safety function.C. They increase voltages above ground potential on conductors and equipment enclosures during normal operation.D. When they're far from their associated circuit conductors, impedance values are kept as low as possible during ground-faultconditions.arrow_forwardRaceways shall not be used as a means of support for Class 2 conductors except under the provisions of _____. A. NEC 300.16(A)B. NEC 300.13(A)C. NEC 300.11(C)(2)D. NEC 300.15(B)arrow_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_forward1. What is the ideal line percent regulation rating? 2. Shunt voltage regulators require __________ samplingarrow_forward5. To interconnect grounding electrodes and form a grounding electrode system, connect the _______ to abusbar.A. bonding jumpers and their equipment grounding conductorsB. equipment grounding conductors and their neutral disconnect linkC. grounding electrode conductors and their bonding jumpersD. neutral disconnect links and their grounding electrode conductorsarrow_forward
- What is the meaning of "system redundancy" in aircraft electrical systems? Explain why system redundancy is important. (Minimum of 200 words)arrow_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_forwardA multiconductor cable, optical fiber cable, or flexible cords of two or more conductors is treated as ____ for percentage conduit fill area calculations. Select one: A. A NEUTRAL NODE B. THREE CONDUCTORS C. TWO CONDUCTORS D. A SINGLE CONDUCTORarrow_forward
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