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

6 inches

Answer

18 inches

Answer

24 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

All bedroom outlets

Answer

All dining room outlets

Answer

All outlets within 20 feet of a pool

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

2 feet

Answer

3 feet

Answer

6 feet

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

0.91

Answer

0.71

Answer

0.58

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

Service entrance cable (SE cable)

Answer

Rigid metal conduit (RMC)

Answer

Intermediate metal conduit (IMC)

Question 6

Under NEC 250.52, which electrode is NOT considered a grounding electrode?

Accepted Answer

A driven ground rod with 25 ohms resistance

Answer

A concrete-encased electrode (Ufer ground)

Answer

Metal underground water pipe

Answer

Metal frame of a building connected to earth

Question 7

According to NEC 230.24, what is the minimum clearance required for service-drop conductors over a public road when traffic could include trucks?

Accepted Answer

18 feet

Answer

10 feet

Answer

12 feet

Answer

15 feet