NEC 2023 Code Questions Practice Test 6

Question 1: What is the minimum working space that should be provided for switch boards and panel boards?

• 6 1/2 feet
• 8 1/2 feet
• 4 1/2 feet
• 2 1/2 feet

NEC Reference: NEC 110.26(A)(3)

Question 2: Which of the following equation is suitable to find the voltage drop in the circuit?

• VD = IR
• VD = I / R
• VD = P / I
• VD = I ² R

Question 3: What is the wattage of the 120 volts single phase motor with a resistance of 20 ohms?

• 720 Watts
• 520 Watts
• 2400 watts
• 6 watts

Question 4: Over current devices must not be located on ..............

• Over the steps of stairway
• Above the panel board
• Bath Rooms
• Wet areas

Question 5: The primary current rating of a motor generator arc welder is 30 A with a duty cycle of 30 %? what is the minimum size branch circuit conductor for welder?

• 12 AWG
• 10 AWG
• 14 AWG
• 8 AWG

NEC Reference: NEC 630.11

Question 6: The maximum over current protection used for resistance type heating elements in electric space-heating equipment?

• 60 amperes
• 40 amperes
• 70 amperes
• 20 amperes

NEC Reference: NEC 424.22(B)

Question 7: For a single family dwelling unit , what is the minimum allowable rating of a 3 wire service entrance conductors?

• 100 amperes
• 150 amperes
• 200 amperes
• 180 amperes

NEC Reference: NEC 230.42(B)

Question 8: An electric heater with a resistance of 18 ohms which draws a current of 7 amps. what is the minimum wattage of electric heater?

• 882 watts.
• 126 watts
• 723 watts
• 184 watts

Question 9: What is the maximum branch circuit load for a 10 kW single electric range in a dwelling unit?

• 8 kW
• 10 KW
• 7 KW
• 6 KW

NEC Reference: NEC Table 220.55

Question 10: Which of the following must be provided near electronic equipment which are exposed to physical damage?

• warning signs
• working space
• enclosures or gaurds
• sufficient head room

NEC Reference: NEC 110.27(B)

Question 11: Along a kitchen countertop wall space, receptacle outlets must be installed so that no point along the countertop is more than how far from a receptacle outlet?

• 24 inches
• 6 feet
• 12 inches
• 10 feet

NEC Reference: NEC 210.52(C)(1)

Question 12: A building is permitted to have more than one service where special conditions apply. Which of the following is a recognized exception to the general one-service rule?

• A fire pump
• A ceiling fan
• A general-purpose lighting circuit
• A toaster

NEC Reference: NEC 230.2(A)

Question 13: A cartridge fuse must be plainly marked, either by printing on the fuse barrel or by a label, showing the ampere rating and:

• Voltage rating and interrupting rating
• The installer's birthday
• No marking is required at all
• Only the color of the fuse

NEC Reference: NEC 240.60(D)

Question 14: For a new feeder installed to a separate building or structure, an equipment grounding conductor must be:

• Run with the feeder conductors
• Omitted entirely for new installations
• Replaced with a garden hose bib connection
• Never required under any condition

NEC Reference: NEC 250.32(B)

Question 15: An equipment grounding conductor must not be used as a grounding electrode conductor, except where it:

• Meets the requirements of both conductor types where specifically permitted
• This is always permitted with no restriction
• It is never permitted under any circumstance
• It has no relationship to grounding electrode conductors

NEC Reference: NEC 250.121

Question 16: Where a single conductor carrying AC current passes through a ferrous metal enclosure, wall, or barrier by itself (without the other conductors of the circuit), the induced currents can cause:

• Excessive heating of the ferrous metal
• No effect at all
• A decrease in temperature
• Increased conductor ampacity

NEC Reference: NEC 300.20

Question 17: A pull box or junction box installed with a plaster or drywall finish must have its cover installed so that it is:

• Flush with, or set back no more than 1/4 inch
• Buried inside the wall permanently
• Sealed shut with no access at all
• It does not matter

NEC Reference: NEC 314.28(E)

Question 18: The ampacity of Type MC cable conductors is determined using the same ampacity tables as:

• Conductors in a raceway
• No table applies to MC cable
• It is a fixed 15 amperes regardless of size
• Fixture wire only

NEC Reference: NEC 330.80

Question 19: Auxiliary gutters are used to supplement wiring space at meter centers, distribution centers, panelboards, and similar equipment, but must not extend a distance greater than:

• 30 feet
• 5 feet
• 100 feet
• There is no limit

NEC Reference: NEC 366.12

Question 20: The minimum wire-bending space at panelboard terminals and clearance between bus bars must be determined in accordance with:

• NEC Table 312.6(A) and 312.6(B)
• No table applies to bus clearance
• The installer's personal preference
• NEC Table 220.12

NEC Reference: NEC 408.18

Question 21: A recessed incandescent luminaire must have thermal protection to reduce the risk of fire due to excessive temperature, integral to:

• The luminaire itself
• A separate device installed a year later
• No thermal protection is ever required
• The branch-circuit breaker only

NEC Reference: NEC 410.130(E)

Question 22: A cord-and-plug connection is generally permitted in lieu of a direct connection for an appliance where the appliance is:

• Identified for flexible cord connection, or to facilitate service
• Never permitted for any appliance
• Only for appliances rated over 50 kW
• It has no bearing on cord-and-plug use

NEC Reference: NEC 422.16(A)

Question 23: Per NEC Article 100, a "branch circuit" is defined as the circuit conductors between the final overcurrent device protecting the circuit and:

• The outlet(s)
• The utility transformer
• Another overcurrent device only
• The grounding electrode

NEC Reference: NEC Article 100

Question 24: An automatic restarting of a motor after shutdown by an overload protective device is:

• Generally prohibited, unless listed for that use
• Always required for every motor
• Never addressed by the NEC
• Required only for motors under 1 hp

NEC Reference: NEC 430.43

Question 25: When a hermetic motor-compressor is marked with both a rated-load current and a branch-circuit selection current, which value must be used for branch-circuit conductor sizing?

• Whichever value is greater
• Whichever value is smaller, always
• Neither value is used
• The average of the two

NEC Reference: NEC 440.6(A)

Question 26: Article 500 references other NFPA documents for the classification of specific hazardous locations, such as the classification of flammable liquid storage facilities. This kind of cross-referencing is addressed in:

• NEC 500.4
• NEC 90.1
• NEC 300.1
• No such reference exists

NEC Reference: NEC 500.4

Question 27: In a Class I hazardous location, where a flexible connection is used, the equipment bonding jumper must not rely solely on:

• The threaded connection points of the flexible fitting
• This is not a concern in hazardous locations
• A bonding jumper is never used in Class I locations
• Duct tape wrapped around the fitting

NEC Reference: NEC 501.30(B)

Question 28: Luminaires in a Class I, Division 2 location that are subject to physical damage must be protected by a suitable guard, or by:

• Location that protects it from damage
• No protection is ever provided
• Wrapping the fixture in plastic
• Painting it a bright color only

NEC Reference: NEC 501.130(B)

Question 29: The mobile home service equipment or main circuit breaker/fuses (disconnecting means) must have a minimum rating of:

• 100 amperes
• 30 amperes
• 50 amperes
• 15 amperes

NEC Reference: NEC 550.32(A)

Question 30: Feeder and service loads for marinas and boatyards are calculated using demand factors from NEC Table 555.12, which generally decrease as:

• The number of berths/receptacles increases
• The number of berths decreases
• Demand factors are always 100%, with no variation
• It has no relationship to berth count

NEC Reference: NEC Table 555.12