F80 Code Requirements 3

Question 1

According to the NEC, what is the minimum burial depth for a rigid metal conduit (RMC) installed under a residential driveway?

Accepted Answer

12 inches

Answer

NEC Table 300.5 requires RMC to be buried at least 6 inches under a residential driveway, but under a one- or two-family dwelling driveway the requirement is 12 inches.

Question 2

Under the NEC, which of the following locations requires GFCI protection for 15- and 20-ampere, 125-volt receptacles?

Accepted Answer

Finished basement living areas

Answer

NEC 210.8(A) requires GFCI protection for receptacles in unfinished and finished basement areas of dwelling units.

Question 3

What is the maximum length of a flexible cord that may be used as a fixed wiring method for a stationary appliance under the NEC?

Accepted Answer

Flexible cords cannot be used as fixed wiring

Answer

NEC 400.12 prohibits flexible cords from being used as a substitute for fixed wiring, regardless of length.

Question 4

According to NEC 310.15, which conductor ampacity correction factor applies when conductors are installed in an ambient temperature of 40°C (104°F)?

Accepted Answer

0.82

Answer

For 75°C-rated conductors at 40°C ambient, NEC Table 310.15(B)(1) specifies a correction factor of 0.82.

Question 5

The NEC requires service-entrance conductors to be protected from physical damage. Which of the following is NOT an acceptable wiring method for service-entrance conductors above a roof?

Accepted Answer

Type NM cable

Answer

NEC 230.43 lists acceptable wiring methods for service-entrance conductors, and Type NM (non-metallic sheathed) cable is not among them.

F80 Practice Test

F80 Practice Test

F80 Code Requirements 3