Journeyman Electrician Practice Test 35

Question 1: What is the maximum overall length of a mobile home power-supply cord?

• 20 ft
• 21 ft
• 28½ ft
• 36½ ft

NEC Reference: NEC 550.10(D)

Question 2: Article 100 defines "nominal voltage" as:

• The insulation withstand voltage
• The voltage at no load only
• The exact voltage read at the meter
• A value naming the system's voltage class

NEC Reference: NEC Article 100

Question 3: What must fuseholders for cartridge fuses be designed to prevent?

• Inserting a lower-amp or higher-volt class fuse
• Mounting the fuseholder horizontally
• Removing a fuse without tools
• Using any time-delay fuse

NEC Reference: NEC 240.60(B)

Question 4: In a commercial load calculation, how is an outlet supplying a luminaire calculated?

• At the installed lamp's wattage
• At 180 VA per outlet
• At 100 VA per outlet
• At the luminaire's maximum rated VA

NEC Reference: NEC 220.14(D)

Question 5: A 1/0 AWG THWN copper conductor is installed in a wet location where the ambient temperature is 40 °C (three current-carrying conductors). What is its corrected ampacity?

• 123 A
• 132 A
• 141 A
• 150 A

NEC Reference: NEC Table 310.16 and Table 310.15(B)(1)(1)

Question 6: Single insulated copper conductors are run in free air (not in a raceway or cable). Which table gives their ampacity?

• Table 310.12
• Table 310.17
• Table 400.5(A)(1)
• Table 310.16

NEC Reference: NEC 310.17

Question 7: In a two-family dwelling, may a branch circuit from Unit A's panel supply a receptacle in Unit B?

• No; only that unit's own loads
• Yes, if it is GFCI protected
• Only for outdoor receptacles
• Yes, if it is labeled

NEC Reference: NEC 210.25(A)

Question 8: May legally required standby system wiring share raceways, boxes and cabinets with general wiring?

• Only if the raceway is fire-rated
• Only in hospitals
• Yes; 701.10 permits it
• No; it must always be separate

NEC Reference: NEC 701.10

Question 9: Which of these must be marked on a motor controller?

• The installing contractor's name
• Maker, voltage, amps or hp, and SCCR
• The motor's serial number
• The date it was installed

NEC Reference: NEC 430.8

Question 10: A 40,000 sq ft hotel (guest rooms without cooking facilities) is being calculated. Using the 2023 NEC unit load, what is the general lighting load before demand factors?

• 120,000 VA
• 80,000 VA
• 68,000 VA
• 52,000 VA

NEC Reference: NEC 220.12 and Table 220.12

Question 11: A pull box has one dimension longer than 6 ft. What is required for the conductors inside it?

• They must be cabled or racked up in an approved manner
• They must be spliced
• They must be in a separate raceway inside the box
• Nothing

NEC Reference: NEC 314.28(B)

Question 12: Which device may provide AFCI protection for an entire dwelling branch circuit under 210.12(A)(1)?

• A surge-protective device
• A standard thermal-magnetic breaker
• A GFCI receptacle at the first outlet
• A listed combination-type AFCI breaker

NEC Reference: NEC 210.12(A)(1)

Question 13: A lifting magnet in a scrap yard would drop its load if its circuit opened. What does 240.4(A) permit?

• Using a GFCI breaker instead
• No overload protection; SC protection stays
• Doubling the breaker size
• No protection of any kind

NEC Reference: NEC 240.4(A)

Question 14: For a dead-front switchboard where all connections and renewable parts are accessible from the front, is working space required behind it?

• Only if it is over 6 ft wide
• Yes, 30 in. behind it
• No; not in the back or sides
• Yes, 3 ft behind it

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

Question 15: What is the unit of inductance?

• Weber
• Ohm
• Farad
• Henry

Question 16: May a water pipe be run inside a raceway that contains electrical conductors?

• No; no such pipes may be in it
• Only for condensate drains
• Yes, if the raceway is PVC
• Yes, if the pipe is insulated

NEC Reference: NEC 300.8

Question 17: In an existing building, must the footing rebar (a concrete-encased electrode) be made part of the grounding electrode system when a service is replaced?

• No, not if it is inaccessible
• Yes, always, even by breaking out concrete
• Only if the building is over 20 years old
• Only for commercial buildings

NEC Reference: NEC 250.50 Exception

Question 18: May wiring be installed in a duct used to transport dust or flammable vapors?

• Only for the duct's own fan
• No; no wiring of any type
• Yes, with Type MC cable
• Yes, in rigid metal conduit

NEC Reference: NEC 300.22(A)

Question 19: A flush-mounted switch is installed in a wet location. What is required?

• Nothing
• A standard plastic plate
• A GFCI switch
• A weatherproof cover

NEC Reference: NEC 404.4(B)

Question 20: A 20-ampere circuit supplies the receptacles of a single bathroom. What else may it supply?

• The kitchen countertop receptacles
• Receptacles in the adjacent bedroom
• Other equipment in that bathroom
• Nothing else at all

NEC Reference: NEC 210.11(C)(3) Exception

Question 21: An isolation transformer has a 1:1 turns ratio. What is its main purpose?

• To correct the power factor
• To isolate the load at the same voltage
• To step the voltage up
• To step the voltage down

Question 22: Splices and taps are made inside a metal wireway. What is the maximum fill at the point of the splices?

• 75%
• 60%
• 40%
• 20%

NEC Reference: NEC 376.56(A)

Question 23: In a single-phase capacitor-start induction motor, what disconnects the starting winding once the motor is running?

• A centrifugal switch
• The run capacitor
• The motor controller
• The thermal overload

Question 24: When may flexible cord be used to connect an appliance?

• Only for appliances under 300 W
• Only for portable lamps
• For interchange, vibration or servicing
• Never; appliances must be hard-wired

NEC Reference: NEC 422.16(A)

Question 25: Which fixed metal parts near a permanently installed pool must be bonded to the equipotential grid?

• All metal within 20 ft
• Only the pool ladder
• Only parts that are energized
• Fixed metal within 5 ft and 12 ft up

NEC Reference: NEC 680.26(B)(7)

Question 26: Under Table 220.12 (2023 NEC), what is the general lighting unit load for religious facilities?

• 1 VA per sq ft
• 1.3 VA per sq ft
• 2.2 VA per sq ft
• 3 VA per sq ft

NEC Reference: NEC 220.12 and Table 220.12

Question 27: May a green-insulated conductor in a Class 2 (power-limited) control cable be used for a purpose other than equipment grounding?

• No; green is always reserved for the EGC
• Only in dwelling units
• Only if it is re-taped black
• Yes, in power-limited cables under 50 V

NEC Reference: NEC 250.119 Exception No. 1

Question 28: Which of these wiring methods is NOT permitted for service-entrance conductors?

• Type SE cable
• Rigid metal conduit
• Type NM cable
• Electrical metallic tubing

NEC Reference: NEC 230.43

Question 29: A transformer is located where it could be struck by vehicles. What does 450.8(A) require?

• Relocating it outdoors
• Protection from physical damage
• Nothing
• A larger kVA rating

NEC Reference: NEC 450.8(A)

Question 30: What is the unit of conductance (the reciprocal of resistance)?

• Siemens
• Henry
• Ohm
• Coulomb