Branch circuit Practice Questions

Question 1: The service disconnect for a mobile home should be located not less than ............ feet above platform

• 1
• 2
• 1/2
• 3

NEC Reference: NEC 550.32(F)

Question 2: What is the minimum tap conductor ampacity which supply 30 amperes industrial heating appliance?

• 10 amperes
• 15 amperes
• 20 amperes
• 25 amperes

NEC Reference: NEC 210.19(A)(4)

Question 3: An industrial heating appliance rated at 45 A is supplied by a tap conductor. what should be the minimum tap conductor ampacity?

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

NEC Reference: NEC 210.19(A)(4)

Question 4: A 2400 watts electric motor is connected to 240 volts single phase supply 2 wire circuit. What is the minimum size TW conductor that is required to carry the load?

• 14 AWG
• 12 AWG
• 10 AWG
• 8 AWG

NEC Reference: NEC 424.3(B)

Question 5: What should be the maximum percentage of cross sectional area of a conduit that should be occupied when three or more THW conductors are placed in a circuit.

• 40 %
• 50 %
• 30 %
• 70 %

Question 6: On a 25 ampere branch circuit what is the minimum size THW conductor that can be used?

• 14 AWG
• 8 AWG
• 12 AWG
• 10 AWG

NEC Reference: NEC 310.15(B)(16)

Question 7: If the branch circuit rating is more than ............. , the lamp holders connected to it should be of the heavy duty type.

• 20 amperes
• 25 amperes
• 40 amperes
• 45 amperes

NEC Reference: NEC 210.21(A)

Question 8: What is the maximum continuous load that can be connected to 240 volts 20 ampere branch circuit?

• 16 amperes
• 20 amperes
• 14 amperes
• 10 amperes

NEC Reference: NEC 210.20

Question 9: A 30 amperes branch circuit is permitted to supply fixed lightening units in ..................

• single family dwelling unit
• multi family dwelling unit
• Any occupancy
• Any occupancy other than dwelling unit

NEC Reference: NEC 210.23

Question 10: What will the  branch circuit calculated load for a single 12 KW electric range in a dwelling unit?

• 6 KW
• 8 KW
• 12 KW
• 15 KW

NEC Reference: NEC 220.55