NEC Chapter 4 Review

18. Conduits and raceways, including end fittings, shall not rise more than _______ in., above the bottom of a switchboard enclosure. (a) 3 (b) 4 (c) 5 (d) 6

(a) 3 408.5

43. Torque requirements for motor control circuit device terminals shall be a minimum of _______ Ib-in. (unless otherwise identified) for screw-type pressure terminals used for 14 AWG and smaller copper conductors. (a) 7 (b) 9 (c) 10 (d) 15

(a) 7 430.9(C)

4. The number of fixture wires in a single conduit or tubing shall not exceed the percentage fill specified in _______. (a) Chapter 9, Table 1 (b) Table 250.66 (c) Table 310.15(B)(16) (d) 240.6

(a) Chapter 9, Table 1 402.7

5. As a general rule, the grounded circuit conductor for the controlled lighting circuit shall be installed at the location where switches control lighting loads that are supplied by a grounded general-purpose branch circuit serving bathrooms, hallways, stairways, or rooms suitable for human habitation or occupancy as defined in the applicable building code. (a) True (b) False

(a) True 404.2(C)

15 Nongrounding, nonlocking-type, 15A and 20A, 125V and 250V receptacles used for replacements in a dwelling unit shall not be required to be listed as tamper resistant. (a) True (b) False

(a) True 406.12 Ex to (1), (2), (3), (4), (5), (6), and (7): (4)

11 Receptacles mounted to and supported by a cover shall be secured by more than one screw unless listed and identified for securing by a single screw. (a) True (b) False

(a) True 406.5(C)

27. In indoor locations other than dwellings and associated accessory buildings, fluorescent luminaires that utilize double-ended lamps and contain a ballast(s) that can be serviced in place shall have a disconnecting means either internal or external to each luminaire. (a) True (b) False

(a) True 410.130(G)(1)

28. When connected to multiwire branch circuits, the fluorescent luminaire disconnect shall simultaneously break all supply conductors of the ballast, including the grounded conductor. (a) True (b) False

(a) True 410.130(G)(2)

23. When electric-discharge and LED luminaires that are designed not to be supported solely by the outlet box are surface mounted over a concealed outlet box, the luminaire shall provide access to the wiring within the outlet box by means of suitable openings in the back of the luminaire. (a) True (b) False

(a) True 410.24(B)

25. Lampholders of the screw-shell type shall be installed for use as lampholders only. (a) True (b) False

(a) True 410.90

26. Luminaires containing a metal halide lamp (other than a thick-glass PAR lamp) shall be provided with a containment barrier that encloses the lamp, or shall be provided with a physical means that only allows the use of a(n) _______. (a) Type 0 lamp (b) Type CB lamp (c) a or b (d) inert gas

(a) Type 0 lamp 410.130(F)(5)

9. General-use _______ switches shall be used only to control permanently installed incandescent luminaires unless listed for control of other loads and installed accordingly. (a) dimmer (b) fan speed control (c) timer a (d) all of these

(a) dimmer 404.14(E)

33. Receptacles for built-in dishwashers and trash compactors shall In be located to protect against physical damage to the _______. (a) flexible cord (b) cord cap (c) appliance (d) receptacle

(a) flexible cord 422.16(B)(2)(4)

48. Separately derived system generators shall have the _______ conductor sized not smaller than required to carry the maximum unbalanced current as determined by 220.61. (a) neutral (b) grounding (c) a and b (d) none of these

(a) neutral 445.13(A)

1. HPD cord shall be permitted for _______. (a) not hard usage (b) hard usage (c) extra-hard usage (d) all of these

(a) not hard usage 400.4 and Table 400.4

44. Open motors having commutators or collector rings shall be located or protected so that sparks cannot reach adjacent combustible material. This shall not prohibit the installation of these motors _______. (a) on wooden floors (b) over combustible fiber (c) under combustible material (d) none of these

(a) on wooden floors 430.14(B) Ex

20. A luminaire marked "Suitable for Wet Locations" _______ be permitted to be used in a damp location. (a) shall (b) shall not (c) a or b (d) none of these

(a) shall 410.10(A)

24. Branch-circuit conductors within _______ in., of a ballast shall have an insulation temperature rating not lower than 90°C (194°F). (a) 1 (b) 3 (c) 6 (d) 8

(b) 3 410.68

32. An in-sink waste disposer can be cord-and-plug-connected, but the cord shall not be less than 18 in. or more than _______ in. in length. (a) 30 (b) 36 (c) 42 (d) 48

(b) 36 422.16(B)(1)(2)

22. In clothes closets, recessed incandescent or LED luminaires with a completely enclosed light source can be installed in the wall or the ceiling, provided there is a minimum clearance of _______ in. between the luminaire and the nearest point of a storage space. (a) 3 (b) 6 (c) 9 (d) 12

(b) 6 410.10(C)(3)

41. The minimum clearance between the heating elements of electric space-heating cables installed in ceilings and outlet boxes and junction boxes used for mounting surface luminaires shall not be less than _______ in. (a) 6 (b) 8 (c) 14 (d) 18

(b) 8 424.39

16. Panelboards supplied by a three-phase, 4-wire, delta-connected system shall have the phase with the higher voltage-to-ground (high-leg) connected to the _______ phase. (a) A (b) B (c) C (d) any of these

(b) B 408.3(E)

17. Panelboard circuit directories can include labels that depend on transient conditions of occupancy. (a) True (b) False

(b) False 408.4(A)

29. Low-voltage lighting systems can be concealed or extended through a building wall, floor, or ceiling without regard to the wiring method used. (a) True (b) False

(b) False 411.5(A)(1)

2. The allowable ampacity of flexible cords and flexible cables is found in _______. (a) Table 310.15(B)(16) (b) Tables 400.5(A)(1) and (2) (c) Chapter 9, Table 1 (d) Table 430.52

(b) Tables 400.5(A)(1) and (2) 400.5(A)

10. Where attachment to an equipment grounding conductor does not exist in the receptacle enclosure, a non-grounding-type receptacle shall be permitted to be replaced with a GFCI-type receptacle; however, some equipment or appliance manufacturers require that the _______ to the equipment or appliance includes an equipment grounding conductor. (a) feeder (b) branch circuit (c) small-appliance circuit (d) none of these

(b) branch circuit 406.4(D)(2)(c) Note 1

21. Luminaires can be installed in a commercial cooking hood if the luminaire is identified for use within a _______ cooking hood. (a) nonresidential (b) commercial (c) multifamily (d) all of these

(b) commercial 410.10(C)(1)

7. Nonmetallic boxes for switches shall be installed with a wiring method that provides or includes a(n) _______. (a) grounded conductor (b) equipment grounding conductor (c) inductive balance (d) none of these

(b) equipment grounding conductor 404.12

45. In determining the highest rated motor for purposes of complying with 430.24, 430.53(B), and 430.53(C), the highest rated motor shall be based on the rated full-load current as selected _______. (a) from the motor nameplate (b) from Tables 430.247, 430.248, 430.249, and 430.250 (c) by multiplying the horsepower by 746 watts (d) using the largest horsepower motor

(b) from Tables 430.247, 430.248, 430.249, and 430.250 430.17

42. The motor _______ currents listed in Tables 430.247 through 430.250 shall be used to determine the ampacity of motor circuit conductors and short-circuit and ground-fault protection devices. (a) nameplate (b) full-load (c) power factor (d) service factor

(b) full-load 430.6(A)(1)

19. Unused openings for circuit breakers and switches in switch- boards and panelboards shall be closed using _______, or other approved means that provide protection substantially equivalent to the wall of the enclosure. (a) duct seal and tape (b) identified closures (c) exothermic welding (d) sheet metal

(b) identified closures 408.7

37. Appliances that have a unit switch with a marked-_______ position that disconnects all the ungrounded conductors can serve as the appliance disconnecting means. (a) on (b) off (c) on/off (d) all of these

(b) off 422.34

46. The motor branch-circuit short-circuit and ground-fault protective device shall be capable of carrying the _______ current of the motor. (a) varying (b) starting (c) running (d) continuous

(b) starting 430.52(B)

38. Conductors located above an electric space-heated ceiling are considered to be operating in an ambient temperature of _______. (a) 20°C (b) 30°C (c) 50°C (d) 86°C

(c) 50°C 424.36

40. Electric space-heating cables shall not be installed _______. (a) in tub and shower walls (b) under cabinets or similar built-ins having no clearance to the floor (c) a and b (d) none of these

(c) a and b 424.38(B)(6) and (7)

34. Wall-mounted ovens and counter-mounted cooking units shall be permitted to be _______. (a) permanently connected (b) cord-and-plug-connected (c) a or b (d) none of these

(c) a or b 422.16(B)(3)

35. Ceiling-suspended (paddle) fans shall be supported independently of an outlet box or by a listed _______. (a) outlet box or listed outlet box system identified for the use and installed in accordance with 314.27(C) (b) outlet box system, a listed locking support and mounting receptacle, and a compatible factory installed attachment fitting designed for support, identified for the use and installed in accordance with 314.27(E) (c) a or b (d) none of these

(c) a or b 422.18(1) and (2)

39. Electric space-heating cables shall not be installed _______ walls. (a) through (b) under (c) a or b (d) none of these

(c) a or b 424.38(B)(4)

12. A receptacle is considered to be in a location protected from the weather when located under roofed open porches, canopies, marquees, and the like, where it will not be subjected to _______. (a) spray from a hose (b) a direct lightning hit (c) beating rain or water runoff (d) falling or wind-blown debris

(c) beating rain or water runoff 406.9(A)

50. Storage batteries, other than lead-acid batteries, and battery management equipment shall be _______. (a) identified (b) labeled (c) listed (d) approved

(c) listed 480.3

36. Any combustible ceiling finish that is exposed between the edge of a ceiling-suspended (paddle) fan canopy or pan and an outlet box and that has a surface area of _______ sq in. or more shall be covered with noncombustible material. (a) 45 (b) 90 (c) 135 (d) 180

(d) 180 422.21

49. If the 15 kW or smaller portable generator was manufactured or remanufactured prior to _______, listed cord sets or devices incorporating listed GFCI protection for personnel identified for portable use shall be permitted. (a) January 1, 2012 (b) January 1, 2013 (c) January 1, 2014 (d) January 1, 2015

(d) January 1, 2015 445.20(B) Ex to (A) and (B)

3. Flexible cord sets and power-supply cords shall not be concealed behind building _______, or run through doorways, windows, or similar openings. (a) structural ceilings (b) suspended or dropped ceilings (c) floors or walls (d) all of these

(d) all of these 400.12(3) and (5)

8. Alternating-current general-use snap switches are permitted to control _______. (a) resistive and inductive loads that do not exceed the ampere and voltage rating of the switch (b) tungsten-filament lamp loads that do not exceed the ampere rating of the switch at 120V (c) motor loads that do not exceed 80 percent of the ampere and voltage rating of the switch (d) all of these

(d) all of these 404.14(A)(1), (2), and (3)

6. Which of the following switches shall indicate whether they are in the open (off) or closed (on) position? (a) General-use switches, (b) Motor-circuit switches. (c) Circuit breakers, (d) all of these

(d) all of these 404.7

14. In dwelling units, all nonlocking-type 125V and 250V, 15A and 20A receptacles installed _______ shall be listed as tamper resistant. (a) in business offices, corridors, waiting rooms and the like in clinics, medical and dental offices and outpatient facilities (b) as a subset of assembly occupancies described in 518.2 to include places of waiting transportation, gymnasiums, skating rinks, and auditoriums (c) in dormitories (d) all of these

(d) all of these 406.12(5), (6), and (7)

31. _______ rated 250V or less and 60A or less, single- or 3-phase, shall be provided with GFCI protection for personnel. (a) Automotive vacuum machines provided for public use (b) Drinking water coolers (c) Cord-and-plug-connected high-pressure spray washing machines (d) all of these

(d) all of these 422.5(A)(1), (2), and (3)

47. An attachment plug and receptacle can serve as the disconnecting means for cord-connected _______. (a) room air conditioners (b) household refrigerators and freezers (c) drinking water coolers and beverage dispensers (d) all of these

(d) all of these 440.13

30. Insulated secondary circuit conductors of low-voltage lighting systems shall be _______. (a) installed in a Chapter 3 wiring method (b) supplied by a Class 2 power source and shall use Class 2 cable in accordance with Article 725 (c) installed not less than 7 ft above the finished floor unless listed for a lower installation height (d) any of these

(d) any of these 411.6(D)(1), (2), and (3)

13. In dwelling units, all nonlocking type 125V and 250V, 15A and 20A receptacles installed _______ shall be listed as tamper resistant. (a) in bedrooms (b) outdoors, at grade level (c) above counter tops (d) in all areas specified in 210.52 and 550.13

(d) in all areas specified in 210.52 and 550.13 406.12(1)

How many parts exist in Article 410?

16

The maximum distance between two pieces of electrical equipment that are considered to be in sight of each other is ? . a. 50' b. 75' c. 100' d. none of the above

50', 100

The ampacity of 18 AWG fixture wire is ? . a. 2 A b. 4 A c. 6 A d. 12 A

6 A, 402.5

Industrial control-panel enclosures shall not be used as junction boxes, auxiliary gutters, or raceways for conductors feeding through or tapping off to other switches or overcurrent devices or other equipment, unless the conductors fill less than 50% of the cross-sectional area of the wiring space. a. True b. False

F, 409.104(A)

Under no condition is the attachment plug cap for a 240-volt room air conditioner in a residential occupancy permitted to be used as the disconnecting means for the room air conditioner. a. True b. False

F, 440.63

Each autotransformer 1,000 volts, nominal, or less shall be protected by an individual overcurrent device installed with each ungrounded input conductor and installed in series with the winding common to both the primary and secondary (shunt winding) of an autotransformer. a. True b. False

F, 450.4(A)

Insulated conductors used within a switchboard or switchgear shall be listed, flame retardant, and voltage rated. a. True b. False

T, 408.19

A panelboard containing a 4-wire, delta-connected system shall be permanently field marked to identify the voltage to ground on the high leg. a. True b. False

T, 408.3(F)(1)

In a residential occupancy, two fixed electric space-heating units are permitted to be supplied by a 30-ampere branch circuit. a. True b. False

T, 424.4(A)

When pipelines are electrically heated, the pipelines must be identified by caution signs or markings. a. True b. False

T, 427.13

A luminaire measuring 12 inches in diameter and weighing six pounds is supported by a screwshell of a lampholder. a. Acceptable b. Violation

acceptable, 410.30(A)

Type SJ flexible cord is recognized ? . a. as a hard usage cord b. as an extra-hard usage cord c. as not a hard usage cord d. for use in dry locations only

as a hard usage cord, 400.4

High-voltage is defined as a potential difference of more than ? , nominal. a. 600 V b. 1,000 V c. 2,000 V d. 4,160 V

b. 1,000 V, 490.2

Low-voltage lighting systems shall not be supplied by a branch circuit rated greater than ? . a. 15 A b. 20 A c. 25 A d. 30 A

b. 20 A, 411.7

The voltage of a storage battery having 12 lead-acid type cells connected in series will be ? . a. 12 V b. 24 V c. 48 V d. 144 V

b. 24 V

The full-load current of a 25-horsepower, 480-volt, 3-phase, squirrel-cage induction motor is ? . a. 27 A b. 34 A c. 68 A d. 74.8 A

b. 34 A, Table 430.250

Which of the following locations would not require a 15-ampere, 125-volt nonlocking-type receptacle to be listed tamper resistant? a. Classroom of a preschool b. Conference room of a business office c. Common area of a hotel d. Dining rooms of a dwelling unit

b. Conference room of a business office, 406.12

A cord-and-plug-connected kitchen waste disposer is installed below the kitchen sink, with the receptacle accessible. A four-foot length of Type SJ cord not subject to physical damage is used. a. Acceptable b. Violation

b. Violation, 422.16(B)(1)(1)

Which of the following conditions must be met before two or more 120-volt, one-horsepower or less motors are permitted to be installed on the same 20-ampere branch circuit? a. The full-load current rating of each motor does not exceed 6 A. b. The rating of the branch-circuit short-circuit and ground-fault protective device marked on any of the controllers is not exceeded. c. Both a. and b. d. Neither a. nor b.

both a and b 430.53(A)

An embedded deicing unit of the resistance type shall not exceed ? of heated area. a. 50 watts/ft^2 b. 100 watts/ft^2 c. 120 watts/ft^2 d. 200 watts/ft^2

c. 120 watts/ft^2, 426.20(A)

When a capacitor that operates at 1,000 volts or less is removed from an energized circuit, the charge on the capacitor shall be drained to ? or less within ? .

c. 50 V / 1 minute 460.6(A)

A panelboard is designed to be placed in a ? .

cabinet, 100

The means of emergency shutdown used for a generator's prime mover shall comply with which of the following provisions? a. Be lockable closed in accordance with NEC 110.25 b. Be equipped with provisions to disable all prime mover start control circuits to render the prime mover incapable of starting c. Initiate a shutdown mechanism that requires a mechanical reset d. Both b. and c.

d. Both b. and c., 445.18(B)

Fixed, industrial-process heating equipment and motors shall be considered ? . a. enclosed b. watertight c. continuous duty d. continuous loads

d. continuous loads, 425.4(B)

A single-throw knife switch shall not be installed in a manner that will ? . a. have the switch in a horizontal position b. require a locking device c. require hand operation d. tend to close the switch with gravity

d. tend to close the switch with gravity 404.6(A)

What type(s) of phase converters are covered by the NEC? a. Reversible b. Rotary c. Static d. Both a. and b. e. Both b. and c.

e. Both b. and c., 455.2

? duty is defined as intermittent operation in which the load conditions are regularly recurrent. a. Continuous b. Intermittent c. Periodic d. Varying

periodic, 100

An overhead projector is mounted below a suspended ceiling of a classroom. The power supply cord serving the projector is run through a hole in the suspended ceiling and is plugged into a receptacle outlet above the ceiling. a. Acceptable b. Violation

violation, 400.12(2)

Three-way switches are installed with the grounded conductor being switched in order to control a lighting fixture from two locations. a. Acceptable b. Violation

violation, 404.2(A)

A 100-ampere resistor bank is connected to a controller with conductor insulation rated 75°C. The resistors are not used in conjunction with the starting current of a motor. a. Acceptable b. Violation

violation, 470.4