NEC 2023 Code Questions Practice Test 7

Question 1: An enclosed channel which holds wires,cables or bus-bars is called as:

• raceway
• panel board
• switch board
• receptacle

Question 2: An ohmmeter connected across 240 electric heater shows the reading of 20 ohms. What is the current flow in the electric heater?

• 12 amperes
• 0.083 ohms
• 0.5 ohms
• 8 amperes

Question 3: A residence has an area of 60 feet by 30 feet. Which of the following is the minimum allowable 120 volts , 20 amperes branch circuits required for general lightening?

• 3
• 2
• 4
• 1

Question 4: A 4 AWG THHN conductor is used to connect a 480 Volts, 3 phase 35 KVA transformer to panel board. what is the maximum length of conductor that can be used in which the voltage drop does not cross 3%?  

• 320 feet
• 640 feet
• 720 feet
• 540 feet

NEC Reference: NEC Chapter 9, Table 8

Question 5: The over load protection must be provided for the motor if it is rated more than ............... Hp.

• 1/8 Hp
• 1/4 Hp
• 1/2 Hp
• 1 Hp

NEC Reference: NEC 430.32(A)

Question 6: What is the maximum continuous load that can be connected to 240 volts 30 amperes branch circuit?

• 24 amperes
• 30 amperes
• 20 amperes
• 26 amperes

NEC Reference: NEC 210.20

Question 7: A incandescent-lamp must not be equipped with medium base if rated more than ............... watts.

• 150 watts
• 200 watts
• 300 watts
• 400 watts

NEC Reference: NEC 410.103

Question 8: In a 14 feet residential hallway, how many minimum number of receptacles are required?

• 2
• 1
• 3
• 4

NEC Reference: NEC 210.52

Question 9: For an electric motor rated not more than ............... horsepower, the branch circuit can server as disconnecting means.

• 1/2 horsepower
• 3/4 horsepower
• 1 horsepower
• 1/8 horsepower

NEC Reference: NEC 422.31(A)

Question 10: What is the minimum volt ampere rating of a 180,000 square foot school?

• 540 KVA
• 320 KVA
• 720 KVA
• 480 KVA

NEC Reference: NEC 220.12

Question 11: For an existing branch circuit without an equipment grounding conductor, a nonlocking-type 15 or 20 ampere receptacle is permitted to be grounded via connection to which of the following, per 250.130(C)?

• The grounding electrode system, or a GFCI without a new EGC
• A garden hose
• It can never be grounded on an existing circuit
• A telephone line

NEC Reference: NEC 250.130(C)

Question 12: For overhead festoon lighting, conductors must be no smaller than what size, unless supported by messenger wire?

• 12 AWG
• 2 AWG
• 18 AWG
• 6 AWG

NEC Reference: NEC 225.6(B)

Question 13: Where a service raceway is exposed to the weather, it must be:

• Rain-tight and suitably drained
• Left open on top for ventilation
• Made of untreated wood
• It does not matter

NEC Reference: NEC 230.53

Question 14: Fixture wires are protected against overcurrent according to their own ampacity table rather than the general conductor OCPD rule of 240.4, per:

• NEC Table 402.5
• NEC Table 310.16
• No table applies to fixture wire
• NEC Table 220.12

NEC Reference: NEC 240.5

Question 15: The grounded conductor connection to the grounding electrode system at a service must be made:

• Accessible
• Always encased in concrete
• Painted shut
• It does not matter

NEC Reference: NEC 250.24(A)(1)

Question 16: An intersystem bonding termination must be provided at the service equipment, or at the disconnecting means for a separate building/structure, for the purpose of connecting:

• Communications system grounding/bonding conductors
• The gas meter only
• Nothing, it has no purpose
• A lightning rod system exclusively

NEC Reference: NEC 250.94

Question 17: Raceways and cables above a suspended ceiling must be independently supported, and must NOT be supported by:

• The ceiling support wires or grid, unless listed for it
• This is always permitted, with no restriction
• Nothing may ever support a raceway
• Only drywall screws directly

NEC Reference: NEC 300.11(A)

Question 18: The allowable ampacities shown in the standard NEC ampacity tables are based on no more than three current-carrying conductors in a raceway or cable, at an ambient temperature of:

• 30 C (86 F)
• 0 C (32 F)
• 100 C (212 F)
• There is no reference temperature

NEC Reference: NEC 310.14

Question 19: Where one or more equipment grounding conductors enter a box, they are counted in the box fill calculation as:

• One single conductor, sized from the largest EGC present
• Each EGC counted separately, no matter how many
• They are never counted at all
• Counted as two conductors, always

NEC Reference: NEC 314.16(B)(2)

Question 20: A run of EMT must not contain more than the equivalent of how many quarter bends (360 degrees total) between pull points, such as boxes or conduit bodies?

• Four quarter bends (360 degrees)
• One quarter bend (90 degrees)
• Ten quarter bends (900 degrees)
• There is no limit

NEC Reference: NEC 358.26

Question 21: A receptacle installed in the floor of a dwelling unit must be:

• Listed for installation in the floor
• Any standard wall receptacle works fine
• Floor receptacles are prohibited entirely
• It does not matter what type is used

NEC Reference: NEC 406.10

Question 22: A cord-and-plug-connected portable immersion heater used to heat liquids in a container must be provided with:

• GFCI protection
• No protection at all
• AFCI protection only
• A dedicated 50 ampere circuit only

NEC Reference: NEC 422.41

Question 23: Heating cables installed within a concrete or poured masonry floor must be identified as suitable for that use, since:

• Embedded use imposes different thermal/mechanical stresses
• Any heating cable works in any application
• It has no bearing on the cable choice
• Concrete floors never use heating cable

NEC Reference: NEC 424.44(B)

Question 24: A feeder tap conductor supplying a motor load must have overcurrent protection consistent with:

• Part IV of Article 430 (branch-circuit protection rules)
• No protection is ever required for motor taps
• Article 250 only
• It has no relationship to Article 430

NEC Reference: NEC 430.28

Question 25: Per NEC Article 100, the "branch-circuit selection current" is the value provided by a manufacturer to be used instead of rated-load current when it is:

• Greater than the rated-load current
• Always less than the rated-load current
• Equal to the voltage rating
• Never used in sizing calculations

NEC Reference: NEC Article 100

Question 26: A secondary tie is a circuit that connects two power sources, such as two transformer secondaries, together at a point other than:

• Their common coupling point
• The generator only
• It has no defined meaning
• The service disconnect only

NEC Reference: NEC 450.6

Question 27: In a Class I hazardous location, open (uninsulated) energized parts such as buses, contacts, or terminals are:

• Not permitted
• Always required to be exposed for cooling
• Permitted with no restriction
• Only permitted at night

NEC Reference: NEC 501.25

Question 28: The overall length of a mobile home power-supply cord, measured from the face of the attachment plug to the point the cord enters the mobile home, must not exceed:

• 36 1/2 feet
• 10 feet
• 100 feet
• There is no maximum

NEC Reference: NEC 550.10(J)

Question 29: Wiring methods installed at a marina or boatyard must be suitable for the wet, corrosive environment, generally including:

• Rigid metal conduit, IMC, PVC, or listed corrosion-resistant MC cable
• Standard indoor NM cable
• Open bare conductors
• No wiring method restrictions apply at marinas

NEC Reference: NEC 555.15

Question 30: A portable generator must be installed and used in accordance with the manufacturer's instructions, considering ventilation and fuel-related fire and carbon monoxide hazards. This general installation guidance is found in:

• NEC 445.4, together with the manufacturer's instructions
• Nowhere, this is not addressed anywhere
• Only the local pizza restaurant's policy
• The vehicle registration office

NEC Reference: NEC 445.4