NEC 2023 Code Questions Practice Test 2

Question 1: Which of the following following locations , easily ignitable fibers / flyings are stored?

• Class I Division I
• Class III Division I
• Class III Division 2
• Class I Division 2

NEC Reference: NEC 500.5(D)(2)

Question 2: What is the minimum size electrical service is required for a single family dwelling unit?

• 100 amperes
• 50 amperes
• 150 amperes
• 175 amperes

NEC Reference: NEC 230.79(C)

Question 3: What must be the electrical fuse rating to protect 12 AWG Branch conductor?

• 20 amperes
• 35 amperes
• 25 amperes
• 40 amperes

NEC Reference: NEC 240.4(D)

Question 4: A sign outlet of an commercial occupancy accessible to pedestrians is a .......................... load

• continuous
• non continuous

Question 5: What is the minimum feeder/service conductor calculated load for an electrical sign?

• 15000 VA
• 12000 VA
• 18000 VA
• 10000 VA

NEC Reference: NEC 220.14(F)

Question 6: What is the minimum ampere rating of short circuit ground fault protective device that can be used for individual motor-compressor?

• 12 amperes
• 15 amperes
• 20 amperes
• 18 amperes

NEC Reference: NEC 440.22(A)

Question 7: An industrial heating appliances rated at 40 A is supplied by a tap conductor. what should be the minimum tap conductor ampacity?

• 20 amperes
• 10 amperes
• 30 amperes
• 25 amperes

NEC Reference: NEC 210.19(A)(4)

Question 8: If a single dwelling family unit consists of one air conditioning unit rated at 4 KW and fixed heating equipment rated at 3 KW. What is the total dwelling unit calculated load?

• 4 KW
• 7 KW
• 3.5 KW
• 3 KW

NEC Reference: NEC 220.60

Question 9: A 4000 watts electric oven is connected to 480 volts electric circuit. what is the resistance of heating element?

• 57.6 ohms
• 8.33 ohms
• 0.12 ohms
• 38.4 ohms

Question 10: What is the maximum rating of panel boards containing 30 ampere or less snap switches?

• 30 amperes
• 120 amperes
• 45 amperes
• 200 amperes

NEC Reference: NEC 408.36(A)

Question 11: Receptacles located within 6 feet of the outside edge of a sink other than a kitchen sink, such as a wet bar sink, require:

• GFCI protection
• No protection
• AFCI protection only
• A dedicated circuit only, no GFCI

NEC Reference: NEC 210.8(A)(9)

Question 12: For a single-branch circuit installation (not more than two 2-wire branch circuits), the outside feeder/branch-circuit disconnecting means must have a rating of not less than:

• 30 amperes
• 10 amperes
• 100 amperes always
• There is no minimum

NEC Reference: NEC 225.39

Question 13: Per NEC Table 230.24(B), overhead service conductors of 0-750 volts over residential property and driveways generally require a minimum vertical clearance of:

• 8 feet
• 12 feet
• 18 feet
• 22 feet

NEC Reference: NEC Table 230.24(B)

Question 14: The ampere rating of a circuit breaker must be:

• Durably marked and visible after installation
• Hidden inside the panel enclosure
• Not required at all
• Marked only on the inside of the breaker

NEC Reference: NEC 240.83(A)

Question 15: A single rod, pipe, or plate electrode with a resistance to earth of 25 ohms or less does not require a supplemental electrode. If the resistance exceeds 25 ohms, what must be done?

• A supplemental electrode must be installed
• Nothing further is required
• The electrode must be removed entirely
• The service must be de-energized permanently

NEC Reference: NEC 250.53(A)(2)

Question 16: Metal gas piping that may become energized must be bonded to which of the following?

• The service equipment or grounding electrode system
• It is never bonded
• Only the gas meter, and nothing else
• The telephone system only

NEC Reference: NEC 250.104(B)

Question 17: A box or conduit body must be installed at each conductor splice point, outlet, switch point, junction point, or pull point, except for which of the following?

• Listed fittings identified for the purpose
• Splices are never allowed anywhere
• A box is always required with no exceptions
• Tape wrapped in the wall cavity, unenclosed

NEC Reference: NEC 300.15

Question 18: When conductors are installed in an ambient temperature different from that used to develop the ampacity tables, the conductor ampacity must be:

• Corrected using the applicable temperature correction factor
• Left unchanged regardless of ambient temperature
• Always doubled
• Ambient temperature is never a factor

NEC Reference: NEC 310.15(B)

Question 19: The sizing rules of NEC 314.28(A) for straight and angle pulls in pull boxes apply specifically to raceways containing conductors of what minimum size?

• 4 AWG and larger
• 14 AWG and smaller only
• It applies to all sizes equally
• Only 18 AWG fixture wire

NEC Reference: NEC 314.28(A)

Question 20: The maximum trade size of electrical metallic tubing (EMT) permitted by the NEC is:

• 2 inches
• 4 inches
• 6 inches
• There is no maximum

NEC Reference: NEC 358.20

Question 21: A dimmer switch used to control general lighting must be:

• Listed for the specific type of load controlled
• Used to control motor loads without restriction
• It does not matter what load type is connected
• Rated for double the connected load, with no listing needed

NEC Reference: NEC 404.14(E)

Question 22: A receptacle being replaced in a location where AFCI protection is currently required by 210.12 must be replaced with:

• An AFCI-protected receptacle (or equivalent protection at the panel)
• A standard non-AFCI receptacle
• AFCI protection is never required on replacement
• A GFCI receptacle only, ignoring AFCI

NEC Reference: NEC 406.4(D)(4)

Question 23: A permanently connected motor-operated appliance rated over 1/8 horsepower, that is not readily accessible, must be provided with a disconnecting means that is:

• Capable of being locked in the open position
• Not required at all
• Always within sight, with no exceptions
• Only a cord-and-plug is acceptable

NEC Reference: NEC 422.31(C)

Question 24: Duct heaters must be interlocked with the associated air-moving equipment so that the heater:

• Cannot energize unless the fan is operating
• Runs independently of the fan at all times
• Has no relationship to the fan
• Runs only when the fan is off

NEC Reference: NEC 424.65

Question 25: Per NEC Table 430.52, for a general polyphase motor, the maximum standard rating of a dual-element (time-delay) fuse is what percentage of motor full-load current?

• 150 %
• 175 %
• 250 %
• 300 %

NEC Reference: NEC Table 430.52

Question 26: Overload protection for a hermetic refrigerant motor-compressor may be provided by which of the following methods?

• A separate overload relay or integral thermal protector
• No overload protection is ever required
• A padlock on the disconnect only
• Painting the compressor a warning color

NEC Reference: NEC 440.52

Question 27: Generators must be installed in a location that provides:

• Adequate ventilation and protection for the environment
• No particular consideration is required
• Direct connection to gas piping only
• Placement indoors only, never outdoors

NEC Reference: NEC 445.4

Question 28: A disconnecting means must be provided to disconnect each transformer from all ungrounded conductors. This disconnect must be located:

• Within sight, or lockable in the open position
• Never required for transformers
• Only at the main service equipment
• Inside the transformer enclosure, hidden

NEC Reference: NEC 450.14

Question 29: In a Class I, Division 1 hazardous location, the primary wiring method permitted is:

• Threaded rigid metal conduit or threaded steel IMC
• Open knob-and-tube wiring
• Standard NM cable
• Bare conductors run in free air

NEC Reference: NEC 501.10(A)

Question 30: Compared to Division 1, a Class I, Division 2 location permits a broader range of wiring methods, including:

• EMT and listed MC cable, under specific conditions
• No additional wiring methods are ever permitted
• Open bare conductors only
• Standard NM cable with no restrictions

NEC Reference: NEC 501.10(B)