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

NEC Table 300.5 requires a minimum burial depth of 12 inches for conductors installed in rigid metal conduit or IMC.

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

The NEC does not permit multiwire branch circuits to be connected to extension cords; each circuit must be properly terminated.

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

NEC 210.52(D) requires that at least one 20-ampere receptacle outlet be installed in bathrooms.

Question 4

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

Accepted Answer

Article 547

Answer

NEC Article 547 covers agricultural buildings and specifies wiring methods that resist the effects of moisture and corrosive atmospheres.

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

NEC 230.70(A)(1) requires the service disconnect to be installed outside or, if inside, nearest the point of entrance of the service conductors.

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