IEC - Independent Electrical Contractors NEC Code General Requirements Questions and Answers

Question 1

According to NEC 110.26(A), what is the minimum required width of the working space in front of an electrical panelboard that is 24 inches wide?

Accepted Answer

30 inches

Answer

24 inches

Answer

36 inches

Answer

48 inches

Question 2

An electrician is installing a 200A, 240V single-phase service disconnecting means in a commercial building. The calculated available fault current is 8,500A. What is the minimum interrupting rating required for this disconnect?

Accepted Answer

10,000A

Answer

5,000A

Answer

8,500A

Answer

22,000A

Question 3

Which of the following must be field-marked on service equipment in locations other than dwelling units, according to NEC 110.24?

Accepted Answer

The maximum available fault current and the date the calculation was performed

Answer

The date of installation and the installer's name

Answer

The arc-flash hazard boundary

Answer

The nominal voltage and amperage rating

Question 4

A new electrical installation has just been completed. According to NEC 110.7, the completed wiring installation must be free from short circuits, ground faults, or any connection to ground that is not...

Accepted Answer

required or permitted by the Code.

Answer

approved by the property owner.

Answer

inspected by the general contractor.

Answer

documented in the as-built drawings.

Question 5

In a commercial facility, a 480V switchgear lineup is over 6 feet wide and rated at 1,200A. What is required regarding access and egress from the working space around this equipment?

Accepted Answer

An entrance at each end of the working space.

Answer

A single entrance at least 36 inches wide.

Answer

The working space must be elevated on a platform.

Answer

Illuminated exit signs must be posted above the equipment.

Question 6

Unless specifically identified for a different temperature, conductors connected to terminals of equipment rated 100 amperes or less shall be sized based on what temperature rating from NEC Table 310.15(B)(16)?

Accepted Answer

60°C

Answer

90°C

Answer

75°C

Answer

The temperature rating of the conductor insulation.