CEP CEP National Electrical Code (NEC) & Code Compliance

Question 1

Under the NEC, what is the minimum burial depth required for direct-buried 120/240V residential service conductors in a trench protected by conduit?

Accepted Answer

12 inches

Answer

6 inches

Answer

18 inches

Answer

24 inches

Question 2

According to NEC Article 210, what is the maximum length of a multiwire branch circuit extension cord allowed in a dwelling unit?

Accepted Answer

The NEC prohibits multiwire branch circuit extension cords

Answer

6 feet

Answer

10 feet

Answer

25 feet

Question 3

NEC 210.52 requires at least one receptacle outlet in each bathroom. What is the minimum ampere rating for such a receptacle?

Accepted Answer

20A

Answer

15A

Answer

25A

Answer

30A

Question 4

Which NEC article governs the installation of conductors and equipment inside structures used for agricultural purposes?

Accepted Answer

Article 547

Answer

Article 550

Answer

Article 555

Answer

Article 560

Question 5

Under NEC 230.70, the service disconnecting means must be located:

Accepted Answer

Outside the building or nearest the point of entry inside

Answer

Inside the electrical room only

Answer

At the nearest accessible location to the service entrance

Answer

In a locked enclosure

Question 6

According to NEC 250.122, if the overcurrent device protecting a circuit is doubled in size, what must be done to the equipment grounding conductor?

Accepted Answer

It must also be increased in size per Table 250.122

Answer

It may remain the same size

Answer

It must be replaced with a bare conductor

Answer

It must be grounded at both ends