Journeyman Electrician Practice Test 22

Question 1: How is the equipment grounding terminal on a receptacle identified?

• A white pressure connector on the back
• A brass screw on the side of the device
• A silver screw on the side of the device
• A green hexagonal screw, not easily removed

NEC Reference: NEC 250.126

Question 2: A ground rod is installed as the supplemental electrode for a metal water pipe electrode. What is the largest copper bonding jumper required where it is the sole connection to the rod?

• 8 AWG
• 6 AWG
• 4 AWG
• 2 AWG

NEC Reference: NEC 250.53(E)

Question 3: Exposed structural steel that is interconnected to form a building frame (and is not intentionally grounded) must be bonded. How is the bonding jumper sized?

• From Table 250.102(C)(1)
• From Table 250.122, by the largest breaker
• Always 6 AWG copper, regardless of service
• Always 4/0 AWG copper, regardless of service

NEC Reference: NEC 250.104(C)

Question 4: Service conductors are run in two parallel raceways, each with 250 kcmil copper ungrounded conductors. The loads are all line-to-line. What is the minimum grounded conductor in each raceway?

• 2 AWG
• 1 AWG
• 1/0 AWG
• 250 kcmil

NEC Reference: NEC 250.24(C)(2)

Question 5: A service has 4/0 AWG copper service-entrance conductors. What is the minimum size aluminum GEC to the metal underground water pipe electrode?

• 2 AWG
• 1/0 AWG
• 3/0 AWG
• 4/0 AWG

NEC Reference: NEC 250.66 and Table 250.66

Question 6: A 12 Ω resistor carries 10 A. How much power does it use?

• 120 W
• 144 W
• 1,200 W
• 1,440 W

Question 7: Two heaters, each rated 3,000 W at 240 V, are mistakenly wired in series across 240 V. What total power do they produce?

• 750 W
• 1,500 W
• 3,000 W
• 6,000 W

Question 8: A 240-volt, single-phase, 50 A load is 150 ft (one way) from the panel. Using K = 12.9 for copper, what is the smallest copper conductor that keeps voltage drop at 3% or less?

• 8 AWG (16,510 cmil)
• 6 AWG (26,240 cmil)
• 4 AWG (41,740 cmil)
• 3 AWG (52,620 cmil)

NEC Reference: NEC Chapter 9, Table 8

Question 9: Receptacles serving dwelling kitchen countertops must be supplied by not fewer than how many small-appliance branch circuits?

• 1
• 2
• 3
• 4

NEC Reference: NEC 210.52(B)(3)

Question 10: A service has four separate service disconnects, as permitted by 230.71. What does 230.72(A) require?

• Each must be located in a separate room
• They may be located anywhere in the building
• Only the largest disconnect must be marked
• Grouped, each marked with the load served

NEC Reference: NEC 230.72(A)

Question 11: Under the 2023 NEC, a new dwelling kitchen has a 3 ft × 6 ft island countertop. What is required at the island?

• At least one receptacle for the first 9 sq ft, plus one per additional 18 sq ft
• Nothing at all
• One receptacle, because it is over 24 in. × 12 in.
• A receptacle, or provisions for the future addition of a receptacle

NEC Reference: NEC 210.52(C)(2)

Question 12: Article 100 defines "listed" equipment as equipment that is:

• In a list by an organization acceptable to the AHJ
• Sold only through a licensed electrical supplier
• Approved in writing by the local electrical inspector
• Marked with the installing contractor's license number

NEC Reference: NEC Article 100

Question 13: A panelboard interior has been splattered with drywall mud and paint during construction. What does 110.12(B) require?

• Internal parts must not be contaminated
• Nothing, as long as the breakers still operate
• Clean only the outside surface of the cover
• Paint over the mud to seal it in place

NEC Reference: NEC 110.12(B)

Question 14: A panelboard is being mounted on a concrete wall. Which mounting method is NOT permitted?

• Expansion anchors set in drilled holes
• Bolts through a unistrut frame anchored to the wall
• Listed concrete anchors
• Wooden plugs driven into holes in the concrete

NEC Reference: NEC 110.13(A)

Question 15: Electrical cables pass through a fire-rated wall. What must be done with the openings around them?

• Firestop them so the fire-resistance rating is maintained
• Nothing; the cables fill the hole
• Seal them with any expanding foam
• Leave a 1 in. air gap for cooling

NEC Reference: NEC 300.21

Question 16: Type NM cable passes through a factory punched hole in a metal stud. What protection is required?

• None; the stud edge is smooth enough
• Electrical tape wrapped around the cable
• A steel plate on both faces of the stud
• Listed bushings or grommets on the edges

NEC Reference: NEC 300.4(B)(1)

Question 17: Four 12/2 NM-B cables (two current-carrying conductors each) pass, without spacing, through the same bored hole in a top plate that will be sealed with fire caulk. What is the adjusted ampacity of each conductor?

• 15 A
• 20 A
• 21 A
• 25 A

NEC Reference: NEC 334.80 and Table 310.15(C)(1)

Question 18: A feeder's ungrounded conductors are reduced in size at a tap point. What does 240.23 permit for the grounded conductor?

• It must remain full size for the whole run
• It must be removed beyond the tap
• It must be increased by one size
• A similar size change is permitted

NEC Reference: NEC 240.23

Question 19: A building is supplied by a feeder from another building. The building disconnect is a 1,200 A breaker on a 480Y/277-volt solidly grounded wye system. What protection is required?

• Ground-fault protection of equipment
• GFCI protection for personnel only
• AFCI protection on the main breaker
• None, because it is not a service

NEC Reference: NEC 240.13

Question 20: What must a motor disconnecting means indicate?

• Whether it is open (off) or closed (on)
• The rated speed of the motor in rpm
• The horsepower of the motor it serves
• The date of the last motor service

NEC Reference: NEC 430.104

Question 21: A 20 hp, 460-volt, 3-phase motor will not start on non-time-delay fuses sized at 300%. What is the largest non-time-delay fuse permitted under Exception No. 2(a)?

• 80 A
• 90 A
• 100 A
• 110 A

NEC Reference: NEC 430.52(C)(1) Exception No. 2(a) and Table 430.250

Question 22: Who may install PV system equipment and its associated wiring and interconnections?

• Only the homeowner
• Only qualified persons
• Anyone, if the equipment is listed
• Only the utility

NEC Reference: NEC 690.4(C)

Question 23: A branch circuit supplies only neon tubing installations (signs). What is the maximum rating of that branch circuit?

• 15 A
• 20 A
• 30 A
• 40 A

NEC Reference: NEC 600.5(B)

Question 24: When must temporary electrical power and lighting installations be removed?

• Only when the inspector orders it removed
• Within 90 days of installation in all cases
• As soon as the construction is completed
• Within one year of the permit date

NEC Reference: NEC 590.3(D)

Question 25: In a designated pediatric patient care location (Category 2), what is required of 125-volt, 15- and 20-ampere receptacles?

• Isolated-ground type receptacles
• GFCI type receptacles only
• Hospital-grade isolated type only
• Listed tamper-resistant type or cover

NEC Reference: NEC 517.18(C)

Question 26: A receptacle in an office is automatically controlled by an energy management system. How must it be marked?

• It needs no marking of any kind
• Installed with a red faceplate
• With a paper label left inside the box
• Marked with the controlled-receptacle symbol

NEC Reference: NEC 406.3(E)

Question 27: May a 2-pole, 120-volt-rated snap switch be fed from two different 120-volt circuits of a 120/240-volt system?

• Only when it controls lighting loads
• Only if listed two-circuit or rated 240 V
• Yes, any multipole switch may be fed that way
• Never, under any condition or listing

NEC Reference: NEC 404.8(C)

Question 28: A receptacle is installed in a box set in the floor of an office. What type of box is required?

• A box listed for use in floors
• A 4 in. square box with a raised cover
• Any standard device box with a cover
• A plastic box with a metal cover

NEC Reference: NEC 314.27(B)

Question 29: A box contains six 12 AWG current-carrying conductors and six 12 AWG equipment grounding conductors (no devices or clamps). Under the 2023 NEC, what box volume is required?

• 15.75 cu in.
• 16.88 cu in.
• 18.00 cu in.
• 27.00 cu in.

NEC Reference: NEC 314.16(B)(5)

Question 30: A dry-type transformer rated 600 V or less is mounted in the open on a wall. Must it be readily accessible?

• Only if it has a primary disconnect
• Yes, every transformer must be readily accessible
• No; open wall-mounted units are exempt
• Only if it is rated over 50 kVA

NEC Reference: NEC 450.13(A)