NEC Code Questions Practice Test-5

Question 1: A single family dwelling unit has a connected load of 4000 VA. which of the following is the calculated demand load?

• 3350 VA
• 3550 VA
• 4000 VA
• 3850 VA

NEC Reference: NEC 220.42

Question 2: What is the adjustment ampacity of a 3/0 THWN conductor at an ambient temperature of 108⁰F in wet location. The raceway contains four 3/0 THWN conductors in it.

• 119 amperes
• 144 amperes
• 153 amperes
• 133 amperes

NEC Reference: NEC 310.15(B)(16)

Question 3: In a dwelling unit has an electric heater rated at 5040 watts at 240 volts. What of the circuit breaker is used to protect the circuit?

• 20 amperes
• 21 amperes
• 24 amperes
• 25 ampere

Question 4: Which of the following locations type NM cable can be permitted to use?

• As a service entrance cable
• In storage battery rooms
• In elevators or escalators
• one and two family dwelling units

NEC Reference: NEC 334.12

Question 5: In an underground service a bare neutral conductor can be buried in the ground with out any insulation.

• True
• False

NEC Reference: NEC 230.30

Question 6: 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

Question 7: What is the unit load per square foot in volt ampere for a restaurant?

• 2 VA
• 1 VA
• 3 VA
• 1 1/2 VA

NEC Reference: NEC 220.12

Question 8: What is permissible voltage drop in percentage for feeders at the farthest outlet of power heating and lighting loads?

• 3 %
• 2 %
• 4 %
• 5 %

NEC Reference: NEC 215.2(A)(4)

Question 9: At least one 15 or 20 ampere receptacle should be located within 50 feet of electrical service applies to outdoor service equipment.

• True
• False

Question 10: The overall length of the power supply cards for mobile homes shall not be less than ………… feet

• 20 feet
• 36 ½ feet
• 25 feet
• 34 feet

NEC Reference: NEC 550.10(D)