EBK ELECTRICAL WIRING RESIDENTIAL
19th Edition
ISBN: 9781337516549
Author: Simmons
Publisher: CENGAGE LEARNING - CONSIGNMENT
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Chapter 20.2, Problem 9R
To determine
Explain how much percentage of the branch-circuit rating is permitted for the size of the neutral conductor.
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Grounding Lighting Fixtures. There are specific requirements for grounding lighting fixtures. How must they be grounded and with what size conductors? Be sure and cite the code in your answers.
What is the maximum size Grounding Electrode Conductor regardless of the size of the service?
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- Fill in the blank The resistance of a wire is 126.48 ohms at 1000C and 100 ohms at 300C. The temperature coefficient of this wire at 00C is ____________ per C0.arrow_forward1. 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_forwardThe ohms per 1000 feet measurements for conductors can be found in _____. Select one: a. article 100 definitions b. 310.15(B)(16) c. annex C d. chapter 9 Table 8arrow_forward
- of p o How many conductors enter the ceiling fan/light wall box? Switch ond out let boxes s tirst 10. What type and size of box may be used for the ceiling fan/light wall box?. 11. What type of covers are used with 4 in. square outlet boxes? 12. a. 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. 13. Approximately how many feet (meters) of 2-wire cable and 3-wire cable are needed to ft complete the circuit supplying the Master Bedroom? Two-wire cable: ft (- m). m). Three-wire cable: 14. If the cable is laid in notches in the corner studs, what protection for the cable must be provided? 15. How high are the receptacles mounted above the finished floor in this bedroom? 16. Approximately how far from the bedroom door is the first receptacle mounted? (See the plans.) 17. What is the distance from the finished floor to…arrow_forwardTo testing installation of grounds, the usual procedure is to connect one lead of the megohmmeter to one of the conductors, then the other lead is___. A, connected to another conductor b, connected to the conduit or raceway c. Connected to a special grounding electrode on the megohmmeter d. Left unconnectedarrow_forwardThe column diagram of a dwelling is given in the following figure. The operating voltage of the line is 220V. In the column line where copper conductors are used, the voltage drop is not required to exceed 1.5%. Accordingly, calculate the conductor cross section to be used on the line and the voltage drop on the line. (k = 56m / ohm.mm2)arrow_forward
- Which 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_forwardWhich of the following is an installation requirement for the grounding electrode conductor in acommunications system?A. It must be run as straight as practicable.B. It must be, at minimum, 4 AWG.C. It must be solid or stranded aluminum.D. It must be isolated and covered.arrow_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. A14/2 type copper used for a general lighting branch circuit. Ampacity:______________ Maximum Fuse or Circuit Breakers Sizes:________________ 2.Three 8 AWG copper conductors with THHN insulation Installed in garage in electrical metallic tubing (EMT). The ambient temperature in the garage can reach as high as 110'F. All termination points for this circuit are rated 60'C. Ampacity:______________ Maximum Fuse or Circuit Breakers Sizes:________________ 3.Four 4 AWG copper conductor with THWN insulation imstalled in EMT in a basement. All termination points are rated at 60'C. Ampacity:______________ Maximum Fuse or Circuit Breakers Sizes:________________ 4. An 8/3 Type UF copper cable installed underground from a house to a detached garage to feed a 120/240-volt subpanel. All termination points are rated at 60'C.…arrow_forwardPotential energy, or voltage, introduced into a circuit is called a(n) ____________________.arrow_forwardPractically it is possible the _______________ cables pass through on poles along with high voltage power cables.arrow_forward
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