Applied Codeology Lesson 11

What is the minimum size fixture wire permitted for the control and operating circuits of industrial X-ray equipment where protected by a 15-ampere overcurrent device? a. 18 AWG b. 16 AWG c. 14 AWG d. 12 AWG

a. 18 AWG 660.9

When installing four conductors in a rigid metal raceway with a sealing fitting such as those found in a Class 1, Division 1 location, what percentage of conduit fill is permitted? a. 25% b. 31% c. 40% d. 53%

a. 25% 501.15(C)(6)

Where installed in a raceway, conductors must be stranded if their size is ? or larger. a. 8 AWG b. 6 AWG c. 4 AWG d. 3 AWG

a. 8 AWG 310.3(C)

What wiring methods shall be permitted for installing intrinsically safe apparatus? a. Any unclassified method b. Only methods in Section 501.10 c. Only methods in Section 502.10 d. Only classified methods

a. Any unclassified method 504.20

A conductor with continuous white or gray covering shall be used only for the grounded circuit conductor. a. True b. False

a. True 200.7(A)

The required branch-circuit overcurrent protection rating for a continuous load of 80 amperes is 100 amperes. a. True b. False

a. True 210.20(A)

Integrated gas-spacer cable is not permitted for use as an interior wiring method. a. True b. False

a. True 326.12

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

a. as a hard usage cord Table 400.4

A ? is defined as an area including a sink (basin) with one or more of the following: a toilet, a urinal, a tub, a shower, a bidet, or similar plumbing fixtures. a. bathroom b. lavatory c. restroom d. any of the above

a. bathroom 100

In general, the main-line contact conductors carried along the runway for an overhead rolling crane shall be supported on insulators at intervals not exceeding ? . a. 10' b. 20' c. 30' d. 50'

b. 20' 610.21(C)

Dusts that present a fire or explosion hazard when dispersed in the air are defined as combustible dusts when the dust is ? or smaller. a. 250 µm b. 500 µm c. 750 µm d. 1,000 µm

b. 500 µm 100

In general, overhead communications cables passing over a roof shall have a vertical clearance of not less than ? above the roof. a. 3' b. 8' c. 10' d. 12'

b. 8' 800.44(B)

Surge-protective devices (SPDs) shall be permitted to be located indoors or outdoors and shall be made accessible to unqualified persons unless listed for installation in inaccessible locations. a. True b. False

b. False 242.22

Copper or aluminum solid or stranded conductors are permitted to be used for the installation of non-power-limited fire alarm circuits. a. True b. False

b. False 760.49(C)

The requirements of Article 682 apply to which of the following installations?I. Fish farm pondII. Decorative poolIII. Storm retention basinIV. Swimming poolV. Treatment pond a. I., II., and IV. b. I., III., and V. c. II. and V. d. II., III., IV., and V.

b. I., III., and V. 682.1

CATV aerial cable is permitted to be attached to an above-the-roof raceway mast provided that the mast does not support or enclose ? . a. flags b. power circuits c. sewage vents d. none of the above

b. power circuits 820.44(A)

The use of Chapter 9, Table 1 for conduit fill allows the use of which additional tables in the notes to Table 1? Select one: a.Tables 4 and 5 b.Tables 4, 5, 5A, and 8 c.Tables 4, 5, 5A, 8, and 11 d.Tables 11A, 11B, 12A, and 12B

b.Tables 4, 5, 5A, and 8

An embedded deicing unit of the resistance type shall not exceed ? of heated area. a. 50 watts/ft2 b. 100 watts/ft2 c. 120 watts/ft2 d. 200 watts/ft2

c. 120 watts/ft2 426.20(A)

Class 2 cables shall have a minimum voltage rating of ? . a. 24 V b. 48 V c. 150 V d. 300 V

c. 150 V 725.179(G)

A 4,160-volt feeder is to be installed in a nonmetallic conduit identified for direct burial without concrete encasement. The minimum covering for the nonmetallic conduit is ? . a. 6" b. 12" c. 18" d. 24"

c. 18" 300.50

The minimum calculated feeder load for 12 feet of show window lighting is ? . a. 1,200 VA b. 1,600 VA c. 2,400 VA d. 3,200 VA

c. 2,400 VA 220.43(A)

The area within ? of the dispenser on an above-ground fuel tank is Class 1, Division 2, up to a height of 18 inches. a. 8' b. 10' c. 20' d. 25'

c. 20' Table 514.3(B)(1)

Instrumentation tray cable with 22 AWG conductors has a maximum ampacity of ? . a. 2 A b. 3 A c. 5 A d. 7 A

c. 5 A 727.1

Type MI cable is required to be strapped at intervals not exceeding ? . a. 3' b. 4' c. 6' d. 10'

c. 6' 332.30

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

c. Periodic 100

Each outlet installed for the purpose of charging electric vehicles shall be supplied by a(n) ? . a. appliance branch circuit b. feeder c. individual branch circuit d. general purpose branch circuit

c. individual branch circuit 625.40

What is 60% of the cross-sectional area of a one-inch EMT conduit? a. 0.268 in2 b. 0.346 in2 c. 0.458 in2 d. 0.519 in2

d. 0.519 in2 Chapter 9, Table 4

When in a raceway with not more than three current-carrying conductors, how many amperes can a 10 AWG THW carry continuously? a. 24 A b. 28 A c. 30 A d. 35 A

d. 35 A Table 310.16

The percentage to use for conduit fill when installing one cable assembly with five conductors in the cable assembly is ? . a. 25% b. 31% c. 40% d. 53%

d. 53% Chapter 9, Table 1

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)

A fuel cell system shall be approved for the application in accordance with which of the following? a. Be listed for the application b. Be evaluated for the application and have a field label applied c. None of the above d. Either a. or b. e. Both a. and b.

d. Either a. or b. 692.6

A supplementary grounding electrode is required when the only grounding electrode available is ? . a. building steel b. a concrete-encased electrode c. a ground ring d. a metal underground water pipe

d. a metal underground water pipe 250.52(A)(1)

When installing six conductors in a nipple between boxes, ? fill shall be permitted to be used. a. 25% b. 53% c. 60% d. none of the above

d. none of the above Chapter 9, Table 1

Direct-current conductors used in the electroplating process shall be protected by which of the following? a. Fuses b. Circuit breakers c. A current-sensing device that operates a disconnecting means d. Other approved means e. Any of the above

e. Any of the above 669.9

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

Circuit breakers used for switching fluorescent lighting circuits shall be marked ? . a. CFL b. HID c. SWD d. either a. or b. e. either b. or c.

e. either b. or c. 240.83(D)

Each multiwire branch circuit shall be provided with a means that will simultaneously disconnect all ungrounded conductors at the point where the branch circuit originates. a. True b. False

a. True 210.4(B)

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

Fire-resistive cable assemblies shall be marked on their surface with the system type and the suffix ? . a. CI b. FR c. FRC d. FRR

d. FRR 728.120

A box used to enclose flush devices shall be of such a design that the devices will be completely enclosed on the back and sides. a. True b. False

a. True 314.19

In an installation of Type NM cable, the 90°C conductor ampacity rating shall be permitted to be used for ampacity adjustment and correction calculations, provided that the final calculated ampacity does not exceed that for a 60°C-rated conductor. a. True b. False

a. True 334.80

When an outlet supplied through an underfloor raceway is removed, the sections of the circuit conductors supplying the outlet shall be removed from the raceway. a. True b. False

a. True 390.57

Open wiring on insulators is a type of wiring that is not permitted to be concealed by the building structure. a. True b. False

a. True 398.12

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

a. True 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

a. True 408.3(F)(1)

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

a. True 427.13

All metal raceways and all non-current-carrying metal parts of fixed and portable electrical equipment, regardless of voltage, installed in a motor fuel dispensing facility shall be grounded and bonded. a. True b. False

a. True 514.16

The classification of a spray painting area, dipping area, or other coating process is based upon dangerous quantities of flammable vapors, combustible mists, residues, dusts, or deposits that are present or might be present in quantities sufficient to produce ignitable or explosive mixtures in the air. a. True b. False

a. True 516.5

A health care facility can be an entire building, part of a building, fixed, or mobile. a. True b. False

a. True 517.2

A solar photovoltaic system shall be permitted to supply power to a building or structure in addition to any other electrical supply system(s). a. True b. False

a. True 690.4(A)

Optional standby systems are intended to supply on-site generated or stored power to selected loads either automatically or manually. a. True b. False

a. True 702.2

The point within a building at which the wire or cable emerges from an external wall or from a concrete floor slab defines point of entrance. a. True b. False

a. True 800.2

Access to electrical equipment shall not be denied by an accumulation of communications circuit wires and cables that prevents removal of panels, including suspended ceiling panels. a. True b. False

a. True 800.21

Area classification for the area inside any tank or container within the scope of the article addressing spray application, dipping, coating, and printing processes using flammable or combustible materials in open containers that contain Class I liquids that are located in ventilated areas shall be classified as Class I, Division 1 or Class I, Zone 0, whichever is ? . a. applicable b. approved c. more protective d. used

a. applicable 516.4(4)

A panelboard is designed to be placed in a ? . a. cabinet b. can c. switchboard d. wireway

a. cabinet 100

A Class II hazardous location is so designated because of the presence of ? . a. combustible dust b. flammable gases or vapors c. ignitable fibers d. ignitable flyings

a. combustible dust 502.1

A(n) ? must identify 15-ampere non-locking receptacles supplied by a COPS where other systems are present. a. illuminated face b. distinctively colored face c. distinctively colored faceplate d. none of the above

a. illuminated face 708.10(A)(2)

A power-driven machine (or group of machines working together in a coordinated manner) not portable by hand while working that is used to process material by cutting; forming; pressure; electrical, thermal, or optical techniques; lamination; or a combination of these processes is the definition of ? . a. industrial machinery b. utilization equipment c. appliance d. electroplating

a. industrial machinery 670.2

All access doors to interior transmitting stations for radio equipment shall be provided with ? , which disconnect all voltages above 350 volts when the door is opened. a. interlocks b. persons c. signs d. none of the above

a. interlocks 810.71(C)

The feeder load for each small-appliance branch circuit required in a dwelling unit is calculated at ? . a. 1,200 VA b. 1,500 VA c. 2,400 VA d. 3,200 VA

b. 1,500 VA 220.52(A)

Overhead branch-circuit conductors, where the voltage does not exceed 150 volts to ground, nominal, shall have a minimum overhead clearance of ? when crossing over a sidewalk. a. 6' b. 10' c. 12' d. 15'

b. 10' 225.18(1)

The required ground-fault circuit-interrupter of a mobile electric sign shall be an integral part of the attachment plug or shall be located in the power supply cord within ? of the attachment plug. a. 6" b. 12" c. 18" d. 6'

b. 12" 600.10(C)(2)

No underwater luminaires shall be installed in a permanently-installed swimming pool that operates on supply circuits over ? between conductors. a. 120 V b. 150 V c. 240 V d. 277 V

b. 150 V 680.23(A)(4)

Theater border lights, other than with heavy-duty lampholders, shall be so arranged that no branch circuit will carry a load exceeding ? . a. 15 A b. 20 A c. 30 A d. 50 A

b. 20 A 520.41(A)

Flat conductor cable is recognized for use as feeder or branch-circuit conductors. a. True b. False

b. False 324.10(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

b. False 440.63

Flexible power cords and cable shall be permitted for the connection of a modular data center to an external source of power. a. True b. False

b. False 646.9(B)

If an irrigation machine has a stationary point, a grounding electrode system in accordance with Article 250, Part III, shall be permitted to be connected to the machine at the stationary point for lightning protection. a. True b. False

b. False 675.15

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

b. Violation 400.12(2)

The information in the Annexes of the NEC is ? . a. enforceable by the AHJ b. not enforceable by the AHJ c. required for all installations d. none of the above

b. not enforceable by the AHJ 90.3

Where rigid metal conduit is threaded in the field, the threading die shall have a taper of ? per foot. a. 1/4" b. 1/2" c. 3/4" d. 1"

c. 3/4" 344.28

A listed primary protector shall be provided on each circuit, aerial or underground, located within the block containing the building served so as to be exposed to accidental contact with electric conductors operating at over ? to ground. a. 100 V b. 150 V c. 300 V d. 600 V

c. 300 V 805.90(A)

Where a power supply cord is used to supply an all-electric mobile home, the power supply cord shall be a single listed ? mobile home power supply cord. a. 30 A b. 40 A c. 50 A d. 100 A

c. 50 A 550.10(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 ? . a. 25 V or less within 3 minutes b. 30 V or less within 30 seconds c. 50 V or less within 1 minute d. 50 V or less within 3 minutes

c. 50 V or less within 1 minute 460.6(A)

When the grounded conductor is to be spliced in a 12" x 12" junction box, there shall be at least ? of free conductor left for splicing. a. 2"460.6(A) b. 4" c. 6" d. 12"

c. 6" 300.14

When the grounded conductor is to be spliced in a 12-inch by 12-inch junction box, there shall be at least ? of free conductor left for splicing. a. 2" b. 4" c. 6" d. 12"

c. 6" 300.14

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.

c. Both a. and b. 430.53(A)

Type 2 SPDs shall be connected anywhere on the ? side of a service disconnect overcurrent device required in Section 230.91 unless installed in accordance with 230.82(8). a. line b. supply c. load d. feed

c. load 242.14(A)

A sign or outline lighting system, shipped as subassemblies, that requires field-installed wiring between the subassemblies to complete the overall sign is defined as a ? . a. host sign b. neon sign c. section sign d. sign body

c. section sign 600.2

In general, the minimum-size aluminum feeder conductors permitted to be installed in parallel is ? . a. 1/0 AWG b. 2/0 AWG c. 3/0 AWG d. 4/0 AWG

a. 1/0 AWG 310.10(G)(1)

The smallest single current-carrying conductor cable permitted to be installed in cable tray in an industrial establishment is ? . a. 1/0 AWG b. 2/0 AWG c. 3/0 AWG d. 4/0 AWG

a. 1/0 AWG 392.10(B)(1)(a)

Where an emergency system is installed in accordance with the NEC, the source of power must be available within ? of the loss of the normal supply. a. 10 seconds b. 30 seconds c. 60 seconds d. 120 seconds

a. 10 seconds 700.12

The requirements of ? shall apply to the installation of optical fiber cables within a building using a premises-powered broadband communication system. a. Section 250.122 b. Section 725.133 c. Section 770.133 d. Section 820.44

c. Section 770.133 840.133

Which of the following is a special requirement for large-scale PV electric supply stations? a. Electrical circuits and equipment shall not be required to be maintained and operated by qualified personnel. b. Large-scale PV electric supply stations shall be installed on buildings. c. Access to PV electric supply stations shall not be restricted by fencing or other adequate means in accordance with 110.31. d. Large-scale PV electric supply stations shall be accessible only to authorized personnel.

d. Large-scale PV electric supply stations shall be accessible only to authorized personnel. 691.4

Energy storage systems can include ? . a. batteries b. capacitors c. flywheels d. all of the above

d. all of the above 706.2