Electrical Wiring Residential
18th Edition
ISBN: 9781285170954
Author: Ray C. Mullin, Phil Simmons
Publisher: Cengage Learning
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Textbook Question
Chapter 24, Problem 7R
If Class 2 conductors are insulated for 150 volts, and the power conductors are insulated for 600 volts, does the code permit pulling these conductors through the same raceway?
(Yes) (No) (Circle the correct answer.) Give the NEC Section number. _________
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9. How is equipment containing ungrounded electrical systems required to be marked? A. With green wiresB. With a sign reading "Caution: Ungrounded System Operating at _______ Volts Between Conductors" C. With a red X
D. With a sign reading "Danger: Do Not Touch Ungrounded System, Operating at _______ Volts"
The wording that I am running into with questions such as "The number of conductors required to be installed between three-way and four-way switches is " is confusing. The text is not expalining this in a way that I am understanding anything other than grounding conductor, which is optional unless I am using a metal box. So what type of "conductor" is beng discussed?
A means shall be provided in each metal box over 100 cubic inches for the connection of an equipment grounding conductor. The means shall be permitted to be ______.
a tapped hole
the cover screw
III. a screw used to mount the box
(a.) I only (c.) I & II only (b.) II only (d.) I, II or III
Chapter 24 Solutions
Electrical Wiring Residential
Ch. 24 - Prob. 1RCh. 24 - Prob. 2RCh. 24 - Prob. 3RCh. 24 - In a home, the low-voltage wiring between the...Ch. 24 - Prob. 5RCh. 24 - The nameplate on a transformer will indicate...Ch. 24 - If Class 2 conductors are insulated for 150 volts,...Ch. 24 - If you use 600-volt rated conductors for Class 2...Ch. 24 - The NEC is very strict about securing anything to...Ch. 24 - Does the Code permit attaching the low-voltage...
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- Does the NEC allow metal raceways to be used with nonmetallic boxes? Yes __________ No __________, NEC __________arrow_forwardThe NEC requires that a(n)_______ be installed at each conductor splice or connection point? A. insulated wire connector B. grounding electrode conductor (ground wire) C. receptacle or junction box D. A, B, and C E. none of thesearrow_forwardEquipment 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_forward
- A ____shall be used to connect the equipment grounding conductors, the service equipment enclosures, and where the system is grounded, the grounded service conductor to the grounding electrode. (a.) bus bar ( b.) 5/8” ground rod (c.) neutral conductor (d.) grounding electrode cond. For equipment rated 1200 amperes or more 600 volts or less, and over 6 feet wide, containing overcurrent devices, switching devices, or control devices, there shall be one entrance not less than ____inches wide and 6 ½ feet high at each end. (a.) 24 (b.) 36 (c.) 30 (d.) 48 When calculating the conductor fill for strut-type channel raceway with internal joiners, the raceway shall be permitted to be filled to _____% of the cross-sectional area. (a.) 20 ( c.) 30 (b.) 25 (d.) 40arrow_forwardof 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_forwardIf you use 600-volt rated conductors for Class 2 wiring, does the Code permit pulling these conductors through the same raceway as the power conductors? (Yes) (No) (Circle the correct answer.) Give the NEC section number. ____________arrow_forward
- 11.a. You're installing an isolated power system in a hospital that'll serve a group of patient care areas. Whichof the following colors must be used for the wire that connects to the terminal at each receptacle that'susually reserved for the neutral conductor?A. Green with a white stripeB. Orange with a distinct stripeC. White with an orange stripeD. Red with a black stripe 11.b. The _______ is typically where the service main bonding jumper is installed or where the systembonding jumper is installed for a separately derived system.A. equipotential planeB. site-isolating deviceC. point of groundingD. isolated power systemarrow_forward______ 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. doublearrow_forward12.a. FMC and LFMC wiring methods are permitted to be used for service-entrance conductors in lengths ofup toA. 12 feet.B. 9 feet.C. 6 feet.D. 3 feet. 12.b. The NEC states that service-drop conductors with voltage limited to 300 volts to ground shall have aminimum of _______ feet vertical clearance from final grade over residential property, driveways, andthose commercial areas not subject to truck traffic.A. 12B. 20C. 15D. 18arrow_forward
- Conductors other than service conductors must not be installed in the same____. A. Service raceway B. Service cable C. Enclosure D. A or Barrow_forward13. If an equipment bonding jumper is run external to a raceway, it must be less than _______ feet.A. 6B. 2C. 4D. 5arrow_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
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