Journeyman Electrician Practice Test 13

Question 1: A building service is supplied from a utility transformer located outside the building. What additional grounding connection does 250.24(A)(2) require?

• A separate ground rod at every panelboard
• None; the building electrode alone is enough
• A bond from the transformer case to the water pipe
• An added neutral-to-electrode bond outside the building

NEC Reference: NEC 250.24(A)(2)

Question 2: A portable generator supplies only cord-and-plug-connected equipment through receptacles mounted on the generator. Must its frame be connected to a grounding electrode?

• Only when the generator is used outdoors
• Only if the generator is rated over 5 kW
• Yes, always, regardless of what it supplies
• No, if the receptacle EGCs are bonded to the frame

NEC Reference: NEC 250.34(A)

Question 3: Which method is NOT permitted for connecting a grounding electrode conductor to a ground rod?

• Soldering
• A listed pressure connector
• A listed ground clamp
• Exothermic welding

NEC Reference: NEC 250.70

Question 4: A 30-ampere circuit normally wired with 10 AWG copper is increased to 8 AWG copper to reduce voltage drop. What size copper EGC is required?

• 6 AWG
• 8 AWG
• 10 AWG
• 12 AWG

NEC Reference: NEC 250.122(B)

Question 5: An equipment bonding jumper on the load side of a 200 A feeder overcurrent device is sized how?

• Same size as the feeder conductors
• From Table 250.102(C)(1): 1/0 AWG
• From Table 250.66, by the service size: 2 AWG
• From Table 250.122, by the 200 A rating: 6 AWG

NEC Reference: NEC 250.102(D)

Question 6: A store has 50 ft of fixed multioutlet assembly where appliances are unlikely to be used at the same time. What load must be included?

• 900 VA
• 1,800 VA
• 4,500 VA
• 9,000 VA

NEC Reference: NEC 220.14(H)

Question 7: A 480-volt, 3-phase load draws 100 A per line. What is its apparent power?

• 166.3 kVA
• 144.0 kVA
• 83.1 kVA
• 48.0 kVA

Question 8: Two 24 Ω heating elements are connected in parallel across 240 V. What is the total current?

• 5 A
• 10 A
• 20 A
• 40 A

Question 9: In a hotel, AFCI protection is required for 120-volt, 15- and 20-ampere branch circuits supplying outlets in:

• Guest rooms and guest suites
• Only the kitchens
• Only the parking garage
• Only the lobby

NEC Reference: NEC 210.12(C)

Question 10: A 30-ampere receptacle is on a branch circuit that supplies two or more receptacles. What is the maximum cord-and-plug load it may supply?

• 20 A
• 24 A
• 27 A
• 30 A

NEC Reference: NEC Table 210.21(B)(2)

Question 11: Service conductors run under a building are considered "outside" the building when installed:

• In NM cable stapled in the crawl space
• In any raceway installed under the slab
• In PVC conduit directly under a wood floor
• In conduit under 18 in. of earth below the building

NEC Reference: NEC 230.6

Question 12: Illumination required for the working space around service equipment and panelboards indoors must NOT be:

• Controlled by automatic means only
• Supplied from a lighting branch circuit
• Provided by LED luminaires
• Located above the equipment

NEC Reference: NEC 110.26(D)

Question 13: Article 100 defines "identified (as applied to equipment)" as:

• Recognizable as suitable for a specific purpose
• Painted a color specified by the manufacturer
• Approved in writing by the local inspector
• Marked with the installer's name and license

NEC Reference: NEC Article 100

Question 14: In a balanced delta-connected 3-phase load, each phase winding carries 20 A. What is the line current?

• 11.5 A
• 20 A
• 34.6 A
• 60 A

Question 15: Type NM cable is generally permitted in one- and two-family dwellings, multifamily dwellings, and other structures permitted to be of which construction types?

• Any construction type
• Type I only
• Types I and II
• Types III, IV and V

NEC Reference: NEC 334.10

Question 16: May a damaged flexible cord be spliced?

• Only 14 AWG+ hard-service cord, properly spliced
• Yes; any cord may be spliced with electrical tape
• Never; a new cord is always required
• Yes, provided the splice is made inside a box

NEC Reference: NEC 400.13

Question 17: Four current-carrying 500 kcmil aluminum THWN conductors (75 °C) are in a raceway in a 40 °C ambient. What is the adjusted ampacity of each?

• 198.4 A
• 218.2 A
• 248.0 A
• 272.8 A

NEC Reference: NEC 310.15(B)(1)(1) and 310.15(C)(1)

Question 18: Single-pole breakers joined with identified handle ties may protect a multiwire branch circuit when the circuit serves:

• Any load connected to it
• Only line-to-neutral loads
• Only 240 V water heaters
• Only 3-phase motor loads

NEC Reference: NEC 240.15(B)(1)

Question 19: In a multi-tenant building, who must have ready access to the overcurrent devices protecting the conductors supplying a tenant space?

• Only the local fire department
• Only the serving utility company
• Only the building owner or agent
• Each occupant, for its own devices

NEC Reference: NEC 240.24(B)

Question 20: How many overload units are required for a 3-phase AC motor (with no other approved protection)?

• Three, one in each phase
• One, in any phase
• None if a breaker is used
• Two, in any two phases

NEC Reference: NEC Table 430.37

Question 21: A 460-volt, 3-phase feeder supplies 50 hp (65 A), 20 hp (27 A) and 10 hp (14 A) motors, each protected by dual-element fuses sized at 175% with the next-size-up allowance. What is the maximum feeder fuse rating?

• 125 A
• 150 A
• 166 A
• 175 A

NEC Reference: NEC 430.52 and 430.62(A)

Question 22: EV supply equipment is rated 80 A. What does 625.43 require for its disconnecting means?

• A disconnect switch mounted on the vehicle
• None; the cord plug serves as the disconnect
• A readily accessible disconnect, lockable open
• A GFCI breaker in the panelboard only

NEC Reference: NEC 625.43

Question 23: Where must the PV system disconnecting means be installed?

• On the roof next to the modules only
• Anywhere in the attic
• Inside the inverter only
• At a readily accessible location

NEC Reference: NEC 690.13(A)

Question 24: In a commercial repair garage, 125-volt, 15- and 20-ampere receptacles in areas where electrical diagnostic equipment, hand tools or portable lighting are used must have:

• AFCI protection
• GFCI protection for personnel
• Twist-lock configurations
• Weather-resistant ratings only

NEC Reference: NEC 511.12

Question 25: Which fixed wiring method is permitted in an assembly occupancy (such as a 300-seat auditorium)?

• Open wiring on insulators
• Type UF cable
• Type NM cable
• Type MC cable

NEC Reference: NEC 518.4(A)

Question 26: An in-sink waste disposer is cord-and-plug connected. What cord length is permitted?

• 4 ft to 8 ft
• 3 ft to 6 ft
• 18 in. to 36 in.
• 6 in. to 18 in.

NEC Reference: NEC 422.16(B)(1)

Question 27: A luminaire installed in a wet location must be marked:

• "Damp Location Only"
• "Suitable for Wet Locations"
• "Indoor Use Only"
• "Suitable for Dry Locations"

NEC Reference: NEC 410.10(A)

Question 28: How many 4 AWG THHN copper conductors may be installed in 1¼ in. EMT? (40% area = 0.598 sq in.; one 4 AWG THHN = 0.0824 sq in.)

• 5
• 6
• 7
• 8

NEC Reference: NEC Chapter 9, Table 1, Table 4 and Table 5

Question 29: A raceway passes from a heated area into a walk-in freezer. What does 300.7(A) require?

• Install an expansion fitting at the wall
• Use only PVC conduit inside the freezer
• Seal it to stop warm air reaching the cold section
• Nothing special is required

NEC Reference: NEC 300.7(A)

Question 30: The GFCI requirement of 445.20 for 125-volt, 15- and 20-ampere receptacles applies to portable generators rated:

• 15 kW or smaller
• Any size
• 25 kW or smaller
• 5 kW or smaller

NEC Reference: NEC 445.20