two minute drill number 27- residential improving your skill in code look up increasing speed drill...

Two Minute Drill Number 27- ResidentialImproving your skill in code Look Up Increasing Speed Drill

Copyright 2008 Ted "Smitty" Smith

Directions Left click on the presentation ICON located at

the bottom of the slide directory to the left of the this slide.

Each slide will transition to the correct answer automatically in 2:00 minutes. The correct answer will transition in 15 seconds. As you progress through the slide show, the time for each question will be reduced.

This drill is primarily concerning residential installations.


1. In guest rooms or guest suites of hotels and motels, and sleeping rooms in dormitories, at LEAST _____ general purpose receptacle(s) installed in the room is/are required to be readily accessible.

a. Oneb.Twoc. Threed.All Copyright 2008 Ted "Smitty"

Smith

1. b 210.60(B)


2. When branch-circuit conductors are contained inside a ballast compartment and they are within 3 inches of the ballast, the conductors shall have a temperature rating of at LEAST _____.

a. 105º Cb. 90º Cc. 75º Cd. 60º C


2. b 410.68


3. In general, when a size 4 AWG or larger insulated conductor enters a panelboard, cabinet, or enclosure, which of the following must be provided?

a. A bonding jumperb.A grounding clipc. An insulated bushingd.An insulated grounding

conductorCopyright 2008 Ted "Smitty" Smith

3. c 300.4(G)


4. Class _____ locations are those that are hazardous because of the presence of easily ignitable fibers or materials producing combustible flyings.

a. Ib. IIc. IIId. IV


4. c 500.5(D)


5. A single-phase, 240-volt, 15kVA generator may have a current load of not more than _____ amperes per line.

a. 62.50b.31.25c. 41.66d.52.50


5. a Current Formula I=P/E I= 15 X 1000=

15.000 240 volts

240

= 62.50 amperesCopyright 2008 Ted "Smitty"

Smith

6. In general, motor control circuits shall be arranged so that they will be disconnected from all sources of supply when _____.

a. The disconnecting means is in the open position.

b. The disconnecting means is not within sight of the controller.

c. The disconnecting means is integral with the controller.

d. Installed in a motor control center.


6. a 430.75(A)


7. Which of the following is permitted for closing an unused circuit breaker opening in panelboards ?

a. Installation of a closure plate or other device that fits securely and closes the opening.

b. Installation of a spare or unused circuit breaker that fits the opening and is listed for the panelboard.

c. Installation of a closure plate listed for the purpose by the manufacturer.

d. All of these are permitted.


7. d 408.7


8. Before demand factors are taken into consideration for commercial buildings, general purpose receptacle loads are to be computed at not less than _____ VA per single or duplex receptacle.

a. 100b. 120c. 150

d. 180


8. d 220.14(1)


9. Which of the following listed conductor insulations have a greater temperature rating when used in a dry location compared to when used in a wet location?

a. THWb.RHWc. THWN

THHWCopyright 2008 Ted "Smitty"

Smith

9. d Tbl. 310.13(A) Tbl. 310.16


10. Which of the following situations regarding grounding, would NOT be in compliance with the standards set forth by the NEC®?

I. Steel reinforcing bars to be poured in a concrete foundation and not connected as part of the grounding system.

II. Concrete foundations with steel reinforcing bars that were not available for use as a grounding electrode because the concrete was poured before the electrical contractor arrived on the job.

a. I onlyb. II onlyc. Both I and IId. Neither I nor II


10. a 250.50, Ex.


11. In a health care facility, low-voltage electrical equipment that is likely to become energized and is frequently in contact with the bodies of patients shall operate on a voltage of _____ or less if the equipment is not approved as intrinsically safe, double-insulated or moisture-resistant.

a. 10b. 24c. 100d. 120


11. a 517.64(A)(1),(2),&(3)


12. When ambient temperature is not a factor, a size 8 AWG single copper conductor with type FEPB insulation, installed in free air, will have a MAXIMUM allowable ampacity of _____.

a. 80 amperesb. 55 amperesc. 45 amperes

d. 83 amperes


12. a Tbl. 310.17


13. For the purpose of determining conductor fill in a device box, a switch is counted as equal to _____ conductor(s), based on the largest conductor connected to the switch.

a. Nob. Onec. Two

d. Three


13. c 314.16(4)


14. When determining the required ampacity of the branch-circuit conductors to supply and AC three-phase, continuous-duty motor, current values of the motor given on _____ shall be used.

a. The motors nameplateb. Table 430.248c. Table 430.52d. Table 430.250


14. d 430.6(A)(1)


15. When calculating the total load for a commercial building, what is the MINIMUM computed load, in volt-amps, required by the NEC® for a branch-circuit supplying an exterior sign?

a. 1200 volt-ampsb. 1800 volt-ampsc. 1500 volt-amps

d. 2000 volt-amps


15. a 220.14(F)


16. Determine the MAXIMUM number of size 1 AWG XHHW compact conductors permitted in a trade size 3 inch, Schedule-40 rigid PVC conduit that is 100 feet long.

a. 21

b.19c. 14d.18


16. a Annex C, Tbl. C. 10(A)


17. The MINIMUM headroom of working spaces about service equipment and motor control centers shall be at LEAST _____.

a. 6 feetb.6 feet, 6 inchesc. 6 feet, 7 inchesd.8 feet


17. b 110.26(E)


18. Class _____ hazardous locations are those in which flammable gases, flammable liquid-produced vapors, or combustible liquid-produced vapors are or may be present in the air in quantities sufficient to produce explosive or ignitable mixtures.



18. a 500.5(B)


19. In indoor areas where walls are frequently washed, such as laundries or car washes, metal conduit and metal panelboards shall be mounted with a _____ space between the wall and conduit or panelboard when the equipment is installed exposed.

a. ¾ inchb. ½ inchc. 1/8 inchd. ¼ inch


19. d 300.6(D)


20. A branch-circuit supplied by size 12 AWG conductors is a _____ rated branch-circuit when protected by a 15 ampere rated circuit breaker.

a. 20-ampereb.25-amperec. 15-ampered.10-ampere


20. c 210.3


End of Drill Click the left mouse

button to advance back to the first question. Each question will now be repeated without the timer to give you a chance to review it and find the answer.

Clicking the left mouse button will advance the slide to the answer and

the code reference.
