NEC Electrical 2

Question 1

What is the minimum size copper grounding electrode conductor required for a service with 200-amp THHN copper conductors?

Accepted Answer

#4 AWG

Answer

Per NEC Table 250.66, a 200-amp service requires a minimum #4 AWG copper grounding electrode conductor.

Question 2

What is the maximum number of 12 AWG THHN conductors permitted in a 1/2-inch EMT conduit?

Accepted Answer

9

Answer

NEC Chapter 9 fill tables allow 9 of the 12 AWG THHN conductors in 1/2-inch EMT at 40% fill.

Question 3

In a dwelling, receptacles installed within 6 feet of a wet bar sink must be protected by what device?

Accepted Answer

GFCI

Answer

NEC 210.8 requires GFCI protection for receptacles near sinks to protect against ground faults.

Question 4

What is the standard mounting height (to center) for a wall switch in a typical dwelling?

Accepted Answer

48 inches

Answer

Switches are commonly mounted at 48 inches to center, though the NEC does not mandate a fixed height.

Question 5

Which color is required for the grounded (neutral) conductor in systems of 120/240 volts?

Accepted Answer

White or gray

Answer

NEC 200.6 requires the grounded conductor to be white or gray for sizes 6 AWG and smaller.

NEC Practice Test