Electrical Wiring Residential
18th Edition
ISBN: 9781285170954
Author: Ray C. Mullin, Phil Simmons
Publisher: Cengage Learning
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Textbook Question
Chapter 16, Problem 16R
When a box-cover unit is installed for an overhead door operator, a time-delay dual-element fuse ampere rating would generally be sized at __________________ % of the unit’s nameplate current rating.
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______ protection of equipment shall be provided for solidly grounded wye electrical services of more than 150 volts to ground, but not exceeding 600
volts phase-to-phase for each service disconnecting means rated 1000 amperes or more.
Select one:
a. arc-fault
b. short circuit
c ground-fault
d. double
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.
5. An automatic switch or cutout is allowed in the equipment grounding conductor circuit when
A. there's a redundant equipment grounding conductor in the circuit.
B. the power sources are disconnected when operated.
C. it's bonded around the disconnecting device.
D. it also opens the neutral.
Chapter 16 Solutions
Electrical Wiring Residential
Ch. 16 - Prob. 1RCh. 16 - What are the circuit ratings? __________________Ch. 16 - Prob. 3RCh. 16 - Prob. 4RCh. 16 - Prob. 5RCh. 16 - a. How many lights are recommended for a one-car...Ch. 16 - From how many points in the garage of this...Ch. 16 - GFCI breakers or GFCI receptacles are relatively...Ch. 16 - The total estimated volt-ampere load of the garage...Ch. 16 - Prob. 10R
Ch. 16 - Prob. 11RCh. 16 - Prob. 12RCh. 16 - In the spaces provided, fill in the cover (depth)...Ch. 16 - What section of the Code prohibits embedding Type...Ch. 16 - Using the suggested cable layout of the garage...Ch. 16 - When a box-cover unit is installed for an overhead...Ch. 16 - When outdoor receptacles are installed where a...Ch. 16 - In order to wire a post light, a homeowner...Ch. 16 - What concerns are there when installing a...
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- 20. Ground-fault protection of equipment is required for large branch circuits of more than 150 volts to ground but not exceeding more than _______ volts phase-to-phase for each disconnect rated at or above 1000 amperes. A. 400 B. 700 C. 1000 D. 600arrow_forwardWho has the responsibility for Code interpretations? When are rules in the PEC mandatory and when are they advisory? What color-coding is required on multiwire branch circuits? What is the basis for figuring the general lighting loads in occupancies?arrow_forwardThe National Electrical Code® requires that all switching be done in the __________ circuit conductor. Select one: A. GROUNDED B. SWITCH LOOP C. GROUNDING D. UNGROUNDEDarrow_forward
- Activity #3 Manual Transfer Switch Circuit Breaker type Introduction: Illustration/set up/ circuit diagram: How MTS work? The procedure of operating the Manual Transfer Switch (MTS)arrow_forward8. Connect the Electronic VOM, set to the ammeter function on the 15mAdc range,between points A and D.9. Close switch S1. Measure current IAB. IAB = 19.5 mAdc 10. Measure current IAD flowing through resistor R1. IAD = 14.8 mAdcAre currents IAB and IAD entering or leaving point A? __________ Is the sum of currents IAB and IAD equal to total current IT? __________Is the current IAB entering or leaving a junction point B? __________arrow_forwardb) Differentiate between Insulated-Neutral and Earthed-Neutral systems as applied to electrical distribution on board ship. c) Explain with sketches why it is necessary that a single ground fault in an insulated-earth distribution system must be located and cleared immediatelyarrow_forward
- The fuse link in dual element time delay fuses is designed to ______ under a large amount of excessive current.arrow_forwardThe NEC requires that each service-disconnecting means be suitable for A. the prevailing conditions.B. disconnecting the meter.C. wet conditions. D. hazardous locations.arrow_forward15. What does a grounding symbol on a construction drawing convey?A. A single ground rodB. A grounding electrode systemC. A ground-fault current pathD. An equipment grounding conductorarrow_forward
- Please answer in typing formatarrow_forward45. A switch or circuit breaker can be used as both the controller and disconnecting means if it a. opens all ungrounded conductors as required by NEC 430.103 b. is protected by an overcurrent device in each ungrounded conductor c. is manually operable, or both power and manually operable d. All of these answersarrow_forwardschedules are typically provided to detail the circuits and overcurrent protection required for listribution equipment. Branch-circuit - Outlet C. d. ore distribution points for electrical in .... Switch Panelboardarrow_forward
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