IEC - Independent Electrical Contractors Conductors and Branch Circuits Questions and Answers

Question 1

An electrician installs a 120/240V single-phase multiwire branch circuit using two single-pole circuit breakers.
To comply with NEC® 210.4(B), what additional component is required at the panelboard where the circuit originates?

Accepted Answer

An identified handle tie.

Answer

A grounding clip for each breaker.

Answer

An arc-fault circuit interrupter for each pole.

Answer

A surge protection device.

Question 2

A conduit contains five current-carrying 8 AWG THHN copper conductors. According to NEC® Table 310.16, the ampacity of an 8 AWG THHN conductor is 55A at 90°C. What is the adjusted ampacity of each conductor after applying the adjustment factor from Table 310.15(C)(1)?

Accepted Answer

44.0A

Answer

55.0A

Answer

50.0A

Answer

38.5A

Question 3

What is the minimum required ampacity for a branch circuit conductor supplying a continuous load of 22A and a noncontinuous load of 10A?

Accepted Answer

37.5A

Answer

32.0A

Answer

40.0A

Answer

27.5A

Question 4

According to NEC® 210.8(A), which of the following areas in a newly constructed dwelling unit requires GFCI protection for all 125V, single-phase, 15- and 20-ampere receptacles?

Accepted Answer

A finished basement.

Answer

A hallway.

Answer

A bedroom closet.

Answer

A home office with no water source.

Question 5

In a habitable room of a dwelling, what is the maximum distance a receptacle can be from any point measured horizontally along the floor line of an unbroken wall space?

Accepted Answer

6 feet

Answer

12 feet

Answer

8 feet

Answer

10 feet

Question 6

A 15-ampere branch circuit supplies both lighting outlets and receptacle outlets in a commercial office. What is the maximum rating of any single cord-and-plug-connected piece of equipment that is NOT fastened in place that can be used on this circuit?

Accepted Answer

12 amperes

Answer

15 amperes

Answer

10 amperes

Answer

7.5 amperes

An electrician installs a 120/240V single-phase multiwire branch circuit using two single-pole circuit breakers.To comply with NEC® 210.4(B), what additional component is required at the panelboard where the circuit originates?

An electrician installs a 120/240V single-phase multiwire branch circuit using two single-pole circuit breakers.
To comply with NEC® 210.4(B), what additional component is required at the panelboard where the circuit originates?