Free NEC Special Occupancies Questions and Answers

Question 1

An electrician is installing wiring for a branch circuit serving a patient bed location in a hospital's general care area. According to NEC Article 517, which of the following is a requirement for the wiring method?

Accepted Answer

The wiring must be installed in a metallic raceway or a cable with a metallic sheath.

Answer

NEC Section 517.13(A) requires that branch circuits serving patient care spaces be installed in a metal raceway or a cable with a metallic armor or sheath that qualifies as an equipment grounding conductor under 250.118. This is to provide a reliable ground-fault current path.

Question 2

Which of the following wiring methods is generally permitted in an assembly occupancy with a fire-rated construction, such as a theater intended to hold over 100 people?

Accepted Answer

Type AC (Armored Cable).

Answer

According to NEC 518.4(A), in an assembly occupancy required to have fire-rated construction, wiring methods must be metal raceways, flexible metal raceways, or specific cable types like Type MI, AC, or MC. Type AC cable is explicitly permitted. Nonmetallic methods are generally restricted to areas not required to be fire-rated.

Question 3

An equipotential plane is being installed in a concrete floor of a livestock confinement area within an agricultural building. What is the MINIMUM size solid copper bonding conductor required to connect this plane to the electrical grounding system?

Accepted Answer

8 AWG

Answer

NEC 547.44(B) specifies that the bonding conductor for an equipotential plane in an agricultural building shall be a solid copper conductor, insulated, covered, or bare, and not smaller than 8 AWG.

Question 4

An electrician is installing service equipment for a new floating dock at a marina. According to NEC Article 555, where must this service equipment be located?

Accepted Answer

On land, adjacent to the structure served.

Answer

NEC 555.4 mandates that the service equipment for a floating dock or marina must be located on land adjacent to the structure served, but not on or in the floating structure itself. It also specifies minimum horizontal and vertical distances from the water.

Question 5

For temporary electrical power and lighting installations on a construction site, what is the general time limit for such an installation before it must be removed or replaced with a permanent system?

Accepted Answer

90 days

Answer

According to NEC 590.3(A), temporary electrical power and lighting installations shall be permitted for a period not to exceed 90 days for purposes such as construction, remodeling, or similar activities.

NEC Practice Test

NEC Practice Test

Free NEC Special Occupancies Questions and Answers