NEC Code Questions Practice Test-3

Question 1: The rated ampacity of a 1/0 THWN in a wet location is 150 amperes. If the same conductor is operated at ambient temperature of 40⁰C. What is its corrected ampacity?

• 132 amperes
• 150 amperes
• 142 amperes
• 138 amperes

Question 2: When eight three wire type AC cables are bundled in a raceway of length more than 24 inch. what is the adjustment factor that must be applied?

• 60 %
• 70 %
• 80 %
• 90 %

Question 3: The flexible cords employed for pool associated motors shall not exceed ………….. feet in length.

• 3
• 5
• 8
• 12

NEC Reference: NEC 680.21

Question 4: Whether by receptacle or direct connection the outlets supplying pool pump motors shall be provided with …………………………………… protection

• Over Current
• GFCI
• Over voltage

NEC Reference: NEC 680.21(C)

Question 5: When a conduit run passing from a Class I , Division 2 location into a unclassified location must have seal located with …………….. feet of the boundary.

• 10
• 15
• 20
• 8

NEC Reference: NEC 501.15

Question 6: If a panel board is supplied by a transformer. The over current device must be located ............. side of the transformer

• Primary Side
• Secondary Side

Question 7: Which of the following is the maximum rating of a branch circuit that supply the primary of low voltage lighting system power supply?

• 20 amperes
• 25 amperes
• 15 amperes
• 30 amperes

NEC Reference: NEC 411.6

Question 8: A lighting unit is connected on a 20 ampere branch circuit on which a fastened-in place appliance is located. What is the maximum percentage branch circuit rating is permitted on the appliance?

• 50 %
• 75 %
• 60 %
• 40 %

NEC Reference: NEC 210.23(A)(2)

Question 9: Which of the following is the smallest size wire permitted for a feeder circuit?

• No 10 AWG
• No 12 AWG
• No 14 AWG
• No 8 AWG

Question 10: When two or more single phase electric ranges are supplied by a 3 phase , 4 wire feeder, the total load computed is on the basis of ………………………….

• Twice the maximum number connected between any two phases
• Four times the maximum number connected between any two phases
• Three times the maximum number connected to a single phase

NEC Reference: NEC 250.55