NEC 2020 Code Questions Practice Test 6

Question 1: When two different size conductor wires are connected in series, the maximum fuse rating should be used is one that protects ................

• smallest size wire
• Largest size wire
• combination of both smallest size wire and largest size wire

Question 2: What percentage of rated ampacity is allowed for each conductor when eight current carrying conductors are equipped in flexible cords?

• 80
• 70
• 60
• 50

NEC Reference: NEC 400.5(A)(3)

Question 3: The conductor amapcity is 150 amperes. What is the maximum allowed conductor ampacity of each conductor if 5 of those conductors are placed in flexible cord?

• 120 amperes
• 135 amperes
• 140 ampere
• 105 amperes

NEC Reference: NEC 400.5(A)(3)

Question 4: Upto what minimum height the underground conductors must be given mechanical protection if they carried up a pole?

• 8 feet
• 12 feet
• 16 feet
• 6 feet

NEC Reference: NEC 300.5(C)(1)

Question 5: What is the maximum demand for eight wall-mounted ovens, house hold electric ranges and other house hold cooking appliances rated at over 1 ¾ KW each?

• 17 KW
• 23 KW
• 28 KW
• 32 KW

NEC Reference: NEC 220.55

Question 6: What is minimum ampere rating of a heavy duty lighting track?

• 15
• 20
• 25
• 30

NEC Reference: NEC 410.153

Question 7: Which of the following is the ampacity of 4 AWG SE cable?

• 70 A
• 65 A
• 80 A
• 85 A

NEC Reference: NEC 338.10(B)

Question 8: Equipment grounding conductors can be considered as current carrying conductors in some cases?

• False
• True

NEC Reference: NEC 310.15(B)(5)

Question 9: What is the demand factor in percentage for a non-dwelling unit with a receptacle load of 15 kVA?

• 75 %
• 50 %
• 80 %
• 60 %

NEC Reference: NEC 220.44

Question 10: At one end of the feeder the voltmeter reads 240 volts. What is minimum reading voltage in volt-meter at the outlet of lighting loads?

• 232.8 volts
• 240 volts
• 235 volts
• 228 volts

NEC Reference: NEC 215.2(A)(4)

Question 11: Overcurrent devices must be located where they will be:

• Readily accessible
• Hidden behind a locked door with no key available
• It does not matter where they are located
• Embedded in concrete permanently

NEC Reference: NEC 240.24(A)

Question 12: The disconnecting means for outside feeder or branch-circuit conductors run to a separate building must be installed:

• At a readily accessible location nearest the point of entry
• Anywhere in the building
• In a locked closet only
• On the roof only

NEC Reference: NEC 225.32

Question 13: Service equipment rated 600 volts or less must be:

• Listed and marked "suitable for use as service equipment"
• Homemade equipment is acceptable
• No listing or marking is required
• Marked only with the installer's name

NEC Reference: NEC 230.66

Question 14: Overcurrent devices are generally not permitted to be located in which of the following rooms or areas?

• Bathrooms of dwelling units
• Garages
• Basements
• Utility rooms

NEC Reference: NEC 240.24(E)

Question 15: A portable generator that supplies only equipment mounted on the generator, or cord-and-plug-connected equipment through receptacles mounted on the generator, is:

• Not required to have a separate grounding electrode
• Always required to have a dedicated ground rod
• Prohibited from ever being grounded
• Required to bond to municipal water piping

NEC Reference: NEC 250.34(A)

Question 16: In multiwire branch circuits, the continuity of a grounded (neutral) conductor must not depend on:

• Device connections, such as at a receptacle
• The service main breaker
• The grounding electrode
• The panelboard bus only

NEC Reference: NEC 300.13(B)

Question 17: Except for specific applications such as fixture wires, flexible cords, and Class 1/2/3 control circuits, the smallest copper conductor permitted for general premises wiring is:

• 18 AWG
• 16 AWG
• 14 AWG
• 12 AWG

NEC Reference: NEC 310.4

Question 18: Enclosures within the scope of Article 314 must be:

• Securely and rigidly supported
• Left to hang freely on the cable
• Supported only by drywall screws through the cover
• Never require support if inside a wall

NEC Reference: NEC 314.23

Question 19: Type AC (armored) cable is permitted to be used for which of the following installations?

• Exposed and concealed work in dry locations
• Direct burial underground
• Wet locations without protection
• Embedded in poured concrete

NEC Reference: NEC 320.10

Question 20: Electrical metallic tubing (EMT) is prohibited from being used where subject to:

• Severe corrosive influences, unless protected
• Any dry, indoor location
• Standard residential branch wiring
• Above suspended ceilings

NEC Reference: NEC 358.12

Question 21: A switch or circuit breaker installed in a wet location, or outside of a building, must be provided with an enclosure that is:

• Weatherproof
• Left open to the elements
• Wooden
• No enclosure is required

NEC Reference: NEC 404.4

Question 22: A receptacle mounted in a box that is set back from the finished wall surface, such as with thick paneling, must be installed so that:

• The mounting yoke is held rigidly at the wall surface
• The receptacle can be left floating inside the wall
• No extension or flush mounting is required
• Tape is used to hold the device in place

NEC Reference: NEC 406.5(A)

Question 23: Lighting systems operating at 30 volts or less (low-voltage lighting systems) must consist of an isolating power supply, low-voltage luminaires, and associated equipment that are all:

• Listed
• Homemade is preferred
• No listing requirement applies
• Only UL marking on the power supply is needed, nothing else

NEC Reference: NEC 411.3

Question 24: A ceiling (paddle) fan weighing more than 35 pounds must be supported independently of the outlet box, unless the box is:

• Listed for the weight of the fan
• Made of PVC
• Painted
• A standard lighting outlet box is always sufficient

NEC Reference: NEC 422.18

Question 25: A dwelling unit permanently installed electric baseboard heater with factory-installed receptacle outlets may have those receptacles connected to which circuit?

• A general-purpose branch circuit, not the heater circuit
• The same circuit as the heating elements
• No circuit at all — it must be capped
• The service disconnect only

NEC Reference: NEC 424.9

Question 26: When fuses are used for motor overload protection, they must be installed:

• One fuse in each ungrounded conductor
• One fuse total, regardless of phase count
• Fuses are never used for overload protection
• Only in the neutral conductor

NEC Reference: NEC 430.36

Question 27: Hermetic refrigerant motor-compressors must be marked with which of the following on the nameplate, in addition to standard motor markings?

• Rated-load current or branch-circuit selection current
• The installer's license number
• No additional marking is required
• The building permit number

NEC Reference: NEC 440.4(A)

Question 28: Generators must be protected from overload by which of the following methods?

• Overcurrent devices, relays, or inherent design protection
• No overload protection is ever required for generators
• A padlock on the enclosure only
• A fire extinguisher nearby only

NEC Reference: NEC 445.12

Question 29: Dry-type transformers rated 600 volts or less and up to 50 kVA are permitted to be installed in fire-rated hollow spaces of buildings, provided they meet ventilation requirements, per which section?

• 50 kVA
• 5 kVA
• 500 kVA
• There is no limit

NEC Reference: NEC 450.13(B)

Question 30: Class II hazardous (combustible dust) locations are subdivided by material group into which of the following?

• Groups E, F, and G
• Groups A, B, C, and D
• Groups 1 and 2 only
• There is no subdivision

NEC Reference: NEC 500.6(B)