NEC Code Questions Practice Test-2

Question 1: A 2/0 THWN conductor is placed in a dry location where the ambient temperature is 45⁰C. What is corrected ampacity of the conductor?

• 170 Amperes
• 160 Amperes
• 165 Amperes
• 175 Amperes

NEC Reference: NEC 310.15(B)(16)

Question 2: Which of the following locations Type AC cable cannot be used?

• Dry Location
• Wet Location
• Cable Trays
• Branch circuits for exposed work

Question 3: When a single generator is used to supply emergency load plus other loads, a single transfer switch can be sufficient to use.

• True
• False

NEC Reference: NEC 700.5(D)

Question 4: Mutli-wire branch circuits shall be permitted in class I division I locations.

• True
• False

NEC Reference: NEC 501.40

Question 5: Proper Grounding in electrical circuit limits ................. and protects the circuit.

• high voltage
• high current
• high power

Question 6: The branch circuits that are connected to luminaries of dwelling units shall have maximum voltage of ..................

• 120 volts
• 240 volts
• 208 volts
• 480 volts

NEC Reference: NEC 210.6

Question 7: The ampacity of the branch conductor that supplies a power supply to the motor which has FLC of 25 amperes is ...............

• 32 amperers
• 25 amperes
• 28 amperes
• 30 amperes

NEC Reference: NEC 31.25

Question 8: Branch circuits and feeders to motor controllers, driving machines shall not exceed of…….. volts

• 600 volts
• 480 volts
• 240 volts
• 120 volts

NEC Reference: NEC 620.3(A)

Question 9: What is the maximum ampere rating of a power supply feeder of mobile homes?

• 25 amperes
• 50 amperes
• 75 amperes
• 45 amperes

NEC Reference: NEC 550.10

Question 10: Dispensing devices for liquefied petroleum gas shall be located not less than …………….. feet from any dispensing device for Class I liquids

• 5 feet
• 10 feet
• 8 feet
• 4 feet

NEC Reference: NEC 514.3(B)(2)