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BASIC NEC 2023

Branch circuit Practice Questions

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Electrical Practice Questions

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This Branch circuit Practice Questions has 10 questions with detailed answers and NEC references. Take the full test, review every wrong answer, and look up the NEC article it references before moving on.

Tip: Work through Ohm's Law problems on paper — don't just read the answers, calculate them yourself.

Topics covered: Voltage, current, resistance, Ohm's Law, series/parallel circuits, and electrical safety.
Passing score: Aim for 90%+ on basic theory — these fundamentals underpin every advanced topic.
Questions: 10 multiple-choice, one correct answer each

10

Questions

15 min

Time

70%

Pass

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Branch circuit Practice Questions — Question List

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

EXAM CARD BASIC

Questions10

Time limit15 min

Pass score70%

Code editionNEC 2023

DifficultyIntermediate

Last reviewedJun 2026

Timer starts immediately. Progress is auto-saved.

Source: NEC 2026 (NFPA 70)