Journeyman Electrician Practice Test 23

Question 1: Article 100 defines the equipment grounding conductor (EGC) as the conductive path that:

• Connects lightning air terminals together
• Connects the electrical system to the earth
• Carries the unbalanced neutral current
• Gives a fault path bonding metal parts to the source

NEC Reference: NEC Article 100

Question 2: A building has a lightning protection system with driven ground rods. May those rods serve as the grounding electrodes for the electrical service?

• Only if the service is rated 200 A or less
• Yes, they are better than ordinary ground rods
• Yes, if they are bonded with 2 AWG copper
• No; they cannot replace the required electrodes

NEC Reference: NEC 250.60

Question 3: A separate 8 AWG copper equipment grounding conductor runs exposed along a wall where it could be damaged. What is required?

• An identified raceway or cable armor
• Nothing; any EGC may run exposed on a wall
• Increasing it to 4 AWG copper instead
• Painting it green so it is easy to see

NEC Reference: NEC 250.120(C)

Question 4: Several transformers share a common grounding electrode conductor. One transformer has 500 kcmil copper secondary conductors. What is the minimum copper tap from that transformer to the common GEC?

• 250 kcmil
• 3/0 AWG
• 1/0 AWG
• 2 AWG

NEC Reference: NEC 250.30(A)(6)(b) and Table 250.66

Question 5: In an industrial plant serviced only by qualified persons, may an insulated black conductor in a multiconductor cable be re-identified as an EGC?

• No, never in any kind of building
• Only in dwelling units with NM cable
• Only if it is 4 AWG or larger
• Yes, if marked at each end and accessible point

NEC Reference: NEC 250.119(B)

Question 6: A 5,500-watt, 240-volt water heater draws how much current?

• 11.5 A
• 22.9 A
• 26.4 A
• 45.8 A

Question 7: A commercial lighting circuit supplies LED luminaires with drivers. On what is the calculated load based?

• The ampere ratings of the drivers
• The rating of the branch-circuit breaker
• A flat 180 VA for each luminaire
• The total lamp wattage marked on the lamps

NEC Reference: NEC 220.18(B)

Question 8: Two household ranges, rated 11 kW and 14 kW, are on one feeder. Using Table 220.55, Column C and Note 2, what is the demand load?

• 25.0 kW
• 12.1 kW
• 11.55 kW
• 11.0 kW

NEC Reference: NEC Table 220.55, Note 2

Question 9: Which receptacles in a dwelling bathroom require GFCI protection?

• Only the receptacle at the vanity sink
• None, if the bathroom has an exhaust fan
• Only those within 6 ft of the tub or shower
• All 125-V through 250-V receptacles there

NEC Reference: NEC 210.8(A)(1)

Question 10: In a dwelling bedroom, may a wall switch-controlled receptacle be installed instead of a switched lighting outlet?

• Yes, except in kitchens and bathrooms
• Only in the living room of the dwelling
• No; a lighting outlet is required in every room
• Only if the room has no windows at all

NEC Reference: NEC 210.70(A)(1) Exception No. 1

Question 11: Which of these may be connected on the supply side of the service disconnecting means?

• Cable limiters (current-limiting devices)
• A branch circuit for a garage receptacle
• An electric water heater branch circuit
• A lighting and appliance panelboard

NEC Reference: NEC 230.82

Question 12: At minimum, what marking must be placed on all electrical equipment?

• The installing contractor's name
• The name of the building owner
• The maker's name, trademark or marking
• The date of the final inspection

NEC Reference: NEC 110.21(A)

Question 13: Electrical equipment rooms that are controlled by a lock are considered:

• Hazardous locations
• Inaccessible to everyone
• Readily accessible to the public
• Accessible to qualified persons

NEC Reference: NEC 110.26(F)

Question 14: In an existing building, a dead-front panelboard is being replaced across a narrow aisle from another dead-front panelboard. When may Condition 2 working clearance be used instead of Condition 3?

• Only if the aisle has emergency lighting
• Written procedures, qualified persons only
• Only if both panels are under 100 A
• Never; Condition 3 always applies

NEC Reference: NEC 110.26(A)(1)(c)

Question 15: What does 300.10 require of metal raceways, cable armor and other metal enclosures for conductors?

• Painted to prevent corrosion
• Insulated from each other at each box
• Joined into one continuous conductor
• Each provided with its own ground rod

NEC Reference: NEC 300.10

Question 16: May single insulated conductors (such as loose THHN) be run along a wall without a raceway or cable sheath?

• Yes, if stapled every 4½ ft
• No; only in a Chapter 3 method
• Yes, if 6 AWG or larger
• Yes, in dry locations only

NEC Reference: NEC 300.3(A)

Question 17: Single-rated THHN conductors are pulled into an underground PVC conduit. Is this permitted?

• No; the raceway interior is a wet location
• Only for feeders, not branch circuits
• Yes, because the conduit keeps them dry
• Yes, if the conduit is buried 24 in. deep

NEC Reference: NEC 300.5(B) and 310.10(C)

Question 18: When may renewable cartridge fuses be used?

• Only on motor branch circuits
• Only on circuits above 600 V
• In any new installation up to 600 V
• Only as replacements, with no tampering

NEC Reference: NEC 240.60(D)

Question 19: In an industrial installation serviced only by qualified persons, transformer secondary conductors up to 25 ft long may supply several grouped overcurrent devices. What is required of the conductor ampacity?

• At least 1/3 of the primary OCPD rating
• At least 125% of the calculated load
• There is no ampacity requirement at all
• Not less than the secondary rating and OCPD sum

NEC Reference: NEC 240.21(C)(3)

Question 20: Generally, how many motors may each controller serve?

• One, with limited exceptions
• Up to six motors
• Up to three motors
• Any number of motors

NEC Reference: NEC 430.87

Question 21: A 10 hp, 230-volt, 3-phase motor has locked-rotor code letter F (5.0 to 5.59 kVA per hp). What is its maximum locked-rotor current?

• 125.5 A
• 140.3 A
• 157.9 A
• 243.0 A

NEC Reference: NEC 430.7(B) and Table 430.7(B)

Question 22: A hydromassage bathtub pump is cord-and-plug connected to a receptacle reached only through a service access panel. Where must the receptacle face be?

• Anywhere inside the tub enclosure
• In direct view, within 1 ft of the opening
• At least 6 ft from the tub rim
• On the outside face of the access panel

NEC Reference: NEC 680.73

Question 23: A panelboard has a 225 A busbar protected by a 200 A main breaker. Using the "sum of breakers" option for a PV connection, the total of all load and PV breaker ratings (excluding the main) may not exceed:

• 180 A
• 200 A
• 225 A
• 270 A

NEC Reference: NEC 705.12(B)(3)(3)

Question 24: A temporary flexible cord enters a box containing a receptacle on a construction site. How must the cord be secured?

• It need not be secured
• By tying a knot inside the box
• With a fitting designed for the purpose
• With electrical tape at the knockout

NEC Reference: NEC 590.4(I)

Question 25: Where must the seal be located in a conduit run entering a motor fuel dispenser?

• Only at the panelboard serving the island
• Within 18 in. of the canopy ceiling
• Anywhere within 10 ft of the dispenser
• First fitting where it leaves earth or concrete

NEC Reference: NEC 514.9(A)

Question 26: May a single-pole switch be installed in the grounded (neutral) conductor of a lighting circuit?

• No, not without opening all conductors
• Yes, that is the preferred method
• Only for outdoor lighting circuits
• Only on 240-volt lighting circuits

NEC Reference: NEC 404.2(B)

Question 27: An electronic lighting control switch (such as an occupancy sensor) must:

• Be protected by a GFCI device
• Use the EGC as its return current path
• Be listed and put no current on the EGC
• Be installed with no neutral at the box

NEC Reference: NEC 404.22

Question 28: Intermediate metal conduit (IMC) must be securely fastened within what distance of each outlet box, junction box or other termination?

• 12 in.
• 18 in.
• 3 ft
• 5 ft

NEC Reference: NEC 342.30

Question 29: How many 6 AWG THHN conductors (0.0507 sq in. each) may be installed in 1 in. EMT (40% fill = 0.346 sq in.)?

• 8
• 7
• 6
• 5

NEC Reference: NEC Chapter 9, Table 1, Note 7

Question 30: May a dry-type transformer be supplied (back-fed) at its marked secondary voltage, so it steps up instead of down?

• Only if the primary is fused at 250%
• Yes, per the manufacturer's instructions
• Only if it is rated under 15 kVA
• Never; transformers are one-way only

NEC Reference: NEC 450.11(B)