NEC Code Questions Practice Test-14

Question 1: If the conduit is placed in hazardous locations , it must be made .................... to prevent sparking when fault current flow through it.

• wrentch tight
• sealed
• bonded
• rugged plastic

NEC Reference: NEC 500.8(E)

Question 2: What are the maximum allowable service dis connectors consist for each service?

• 4
• 2
• 6
• 8

NEC Reference: NEC 230.71(A)

Question 3: What is the smallest rating plug fuse that is used for residential 120 volts branch circuit?

• 15 amperes
• 20 amperes
• 12 amperes
• 18 amperes

NEC Reference: NEC 240.6(A)

Question 4: What is the voltage drop of two 10 AWG THWN conductors that supply 16 amperes 115 volts load located 50 feet from the source?

• 1.92 volts
• 0.96 volts
• 2.4 volts
• 1.8 volts

Question 5: What is the minimum volt ampere rating of a 110,000 square foot school?

• 330 KVA
• 220 KVA
• 165 KVA
• 440 KVA

NEC Reference: NEC 220.12

Question 6: A disconnecting means should be visibly located from a motor not more than .............. distance.

• 50 feet
• 40 feet
• 55 feet
• 60 feet

Question 7: A 4800 watts electric motor is connected to 240 volts single phase supply, 2 wire circuit. what is the minimum size THW conductor that is required to supply the load?

• 14 AWG
• 12 AWG
• 10 AWG
• 8 AWG

NEC Reference: NEC 424.3(B)

Question 8: What is the minimum allowable 3 wire service entrance conductor rating for a single family dwelling unit?

• 100 amperes
• 125 amperes
• 150 amperes
• 75 amperes

NEC Reference: NEC 230.42(B)

Question 9: An electric heater with a resistance of 18 ohms draws a current of 7 amperes. what is the minimum wattage of electric heater?

• 882 watts.
• 764 watts
• 126 watts
• 922 watts

Question 10: what is the maximum over current device rating that is allowed to placed  to protect panel board instrumentation circuit?

• 30 amperes
• 15 amperes
• 20 amperes
• 10 amperes

NEC Reference: NEC 408.52