NEC 2023 Code Questions Practice Test 8

Question 1: What is the maximum 3 phase load that can be connected on a 220 ft 8 THWN , 480 volts conductor without exceeding the NEC recommended voltage drop?

• 40 KVA
• 45 KVA
• 48 KVA
• 44 KVA

NEC Reference: NEC Chapter 9, Table 8

Question 2: What is the minimum general lighting load required for a 1500 square feet ware house as permitted by NEC?

• 375 VA
• 1500 VA
• 585 VA
• 1245 VA

Question 3: A 240 volts single phase room air-conditioner rating not more than ............. can be consider as a single motor unit?

• 30 amperes
• 40 amperes
• 50 amperes
• 60 amperes

NEC Reference: NEC 440.62(A)(2)

Question 4: If a replacement motor compressor draws 48 amperes , what s the minimum rating of disconnect means?

• 46 amperes
• 40 amperes
• 50 amperes
• 44 amperes

NEC Reference: NEC 440.12(A)(1)

Question 5: The single phase switches can be used to control the motors when they are rated at ......... horse power or less.

• 1/2
• 1/4
• 3/4
• 1

Question 6: What should be the maximum percentage cross sectional area of a conduit that should be occupied when three or more THW conductors are placed in a conduit?

• 40 %
• 25 %
• 30 %
• 45 %

NEC Reference: NEC Chapter 9, Table 1

Question 7: What is the resistance offered by electric heater rated 1800 watts at 120 volts?

• 8 ohms
• 15 ohms
• 6 ohms
• 12 ohms

Question 8: Intrinsically safe conductors are identified by ..............

• red
• black
• blue
• brown

NEC Reference: NEC 504.80(C)

Question 9: Which of the following is the smallest conductor permitted for pool equipment is :

• 8 AWG
• 12 AWG
• 10 AWG
• 6 AWG

NEC Reference: NEC 680.26(B)

Question 10: In addition to limiting surge voltages, a grounded electrical system serves to stabilize the voltage to earth during:

• Normal operation
• It has no effect on normal operation
• Only during a power outage
• Only when the system is de-energized

NEC Reference: NEC 250.4(A)(2)

Question 11: Service conductors installed as open conductors must maintain clearance from a fire escape of at least:

• 3 feet
• 1 foot
• 10 feet
• No clearance is required

NEC Reference: NEC 230.9(B)

Question 12: Where a conductor supplies continuous and noncontinuous loads, and the rules of 210.19/210.20 or 215.2/215.3 do not otherwise specify, conductors must be protected in accordance with their:

• Ampacities specified in 310.14 and 310.15
• A fixed value of 15 amperes, always
• The voltage rating only
• No rule applies at all

NEC Reference: NEC 240.4(C)

Question 13: A concrete-encased electrode (Ufer ground) must consist of at least 20 feet of steel reinforcing bar (at least 1/2 inch in diameter) or 20 feet of bare copper conductor (at least 4 AWG), encased in at least how much concrete?

• 2 inches
• 1/4 inch
• 12 inches
• No minimum concrete cover is specified

NEC Reference: NEC 250.52(A)(3)

Question 14: A metal underground water pipe qualifies as a grounding electrode when it is in direct contact with the earth for at least:

• 10 feet
• 2 feet
• 50 feet
• Any length qualifies

NEC Reference: NEC 250.52(A)(1)

Question 15: For direct-buried cables under a 4 inch thick concrete or masonry exterior slab with no vehicular traffic (such as a sidewalk), with the slab extending at least 6 inches beyond the buried cable, the minimum cover is generally reduced to:

• 18 inches
• 36 inches
• 6 inches
• No reduction is ever permitted

NEC Reference: NEC Table 300.5

Question 16: In a 3-wire circuit with two ungrounded conductors and a neutral, the neutral is NOT counted as a current-carrying conductor for ampacity adjustment purposes when it carries only:

• Unbalanced current from the other conductors
• The same current as both ungrounded conductors combined
• It is always counted regardless of the load type
• It never carries current at all

NEC Reference: NEC 310.15(A)(3)

Question 17: Where one or more internal cable clamps are present in a box, the box fill calculation must include an allowance equal to:

• One conductor, sized from the largest conductor present
• One conductor per clamp present, regardless of number
• Zero, clamps are never counted
• Four conductors, always

NEC Reference: NEC 314.16(B)(3)

Question 18: Insulated conductors used in Type AC cable must be of a type recognized by Article 310, with an internal bonding strip in contact with the armor along its length. This bonding strip is used to:

• Provide a supplementary equipment grounding path
• Add insulation thickness only
• Improve the cable's color coding
• It has no electrical function

NEC Reference: NEC 320.104

Question 19: Flexible cords must be used without splice or tap, except as permitted for:

• Listed hard-usage cords or identified repair methods
• Any cord may be spliced freely
• Splicing flexible cord is always required
• It has no relevance to flexible cords

NEC Reference: NEC 400.13

Question 20: A general-use snap switch used to control a motor rated over 2 horsepower must generally be:

• Horsepower rated
• Any general-use switch, with no restriction
• No switch is ever permitted for motors
• Rated in ohms only

NEC Reference: NEC 404.14(D)

Question 21: Each panelboard must be durably marked by the manufacturer with the voltage, current rating, and:

• Number of phases
• The installer's home address
• No marking is required
• The customer's billing information

NEC Reference: NEC 408.30

Question 22: A surface-mounted fluorescent fixture installed in a clothes closet must maintain a minimum clearance from the nearest point of storage space of:

• 6 inches
• 12 inches
• 24 inches
• 1 inch

NEC Reference: NEC 410.16

Question 23: Where fixed electric space-heating equipment includes a motor rated over 1/8 horsepower, such as a blower motor, the equipment disconnecting means requirements of Article 424 apply in addition to:

• The motor disconnect rules of Article 430, Part IX
• Nothing additional is ever required
• Article 250 only
• It has no relationship to Article 430

NEC Reference: NEC 424.19(B)

Question 24: For a stationary motor rated 2 horsepower or less, and 300 volts or less, a general-use switch is permitted to serve as the disconnecting means if it has an ampere rating of at least:

• Twice the motor full-load current
• Half the motor full-load current
• Exactly the motor full-load current, no more no less
• There is no ampere requirement

NEC Reference: NEC 430.109(E)

Question 25: In Class II hazardous (combustible dust) locations, wiring methods and fittings must be designed and installed to minimize the entrance of dust, generally requiring connections that are:

• Dust-tight
• Open and unsealed
• It does not matter in Class II locations
• Waterproof only, dust is not a concern

NEC Reference: NEC 502.10

Question 26: The NEC covers the installation and removal of electrical conductors, equipment, and raceways for public and private premises, including which of the following?

• Mobile and manufactured homes
• Nothing outside of a single-family house
• Only industrial plants
• Only high-voltage transmission lines

NEC Reference: NEC 90.2

Question 27: Per NEC Article 100, a "qualified person" is one who has skills and knowledge related to the construction and operation of electrical equipment, and has received:

• Safety training on the hazards involved
• A college degree only, with no training
• No training of any kind
• A driver's license only

NEC Reference: NEC Article 100

Question 28: The dedicated equipment space above a panelboard, extending from the top of the equipment to the structural ceiling (up to a maximum of 6 feet), must be kept:

• Clear of foreign (non-electrical) systems
• Filled with plumbing pipes for convenience
• It has no restriction
• Used for general storage

NEC Reference: NEC 110.26(E)

Question 29: A conductor with white or gray insulation may be used as an ungrounded (hot) conductor only if it is:

• Permanently reidentified at each termination
• Never permitted under any circumstance
• Left unmarked, with no restriction
• Only used outdoors

NEC Reference: NEC 200.7

Question 30: Where a service consists of more than one enclosure grouped at one location under 230.71, each disconnect must be:

• Permanently marked to identify the load served
• Left unlabeled, since grouping makes it obvious
• Painted a single color with no labels
• Marked only with the installer's initials

NEC Reference: NEC 230.72(A)