PC - Professional Electrical Contractor Special Occupancies and Equipment Questions and Answers

Question 1

According to NEC Article 680, what is the minimum requirement for equipotential bonding of the perimeter surface of a permanently installed swimming pool?

Accepted Answer

A #8 AWG solid copper conductor secured within or under the perimeter surface 4-6 inches below subgrade, 18-24 inches from the inside walls.

Answer

A #8 AWG solid copper conductor buried 12-18 inches deep, 12-18 inches from the inside wall.

Answer

A #6 AWG stranded copper conductor in conduit placed 24-30 inches from the inside wall.

Answer

A #6 AWG solid aluminum conductor buried 6-8 inches deep, 36 inches from the inside wall.

Question 2

A contractor is installing electrical systems in a new hospital's operating room, which is a Category 1 space. Which branches are required for the Essential Electrical System (EES) in this area?

Accepted Answer

Life Safety, Critical, and Equipment branches.

Answer

Life Safety and Critical branches only.

Answer

Emergency and Standby branches.

Answer

Normal Power and an Optional Standby System.

Question 3

In a hazardous location classified as Class I, Division 1, what is the primary concern that dictates the wiring methods and equipment used?

Accepted Answer

The presence of flammable gases or vapors is expected under normal operating conditions.

Answer

The presence of combustible dust during normal operation.

Answer

The presence of easily ignitable fibers or flyings.

Answer

The presence of flammable gases or vapors under abnormal conditions.

Question 4

For a solar photovoltaic (PV) system installed on a building, what are the requirements for rapid shutdown for controlled conductors located MORE than 3 feet from the point of entry inside the building?

Accepted Answer

They must be limited to not more than 30 volts within 30 seconds of shutdown initiation.

Answer

They must be limited to not more than 80 volts within 60 seconds of shutdown initiation.

Answer

They must be de-energized to 0 volts within 10 seconds of shutdown initiation.

Answer

They are not subject to rapid shutdown requirements.

Question 5

Which of the following wiring methods is generally NOT permitted for wiring within an elevator hoistway, according to NEC Article 620?

Accepted Answer

Type NM (Nonmetallic-sheathed) cable.

Answer

Rigid metal conduit (RMC).

Answer

Electrical metallic tubing (EMT).

Answer

Intermediate metal conduit (IMC).

Question 6

In a patient care space of a health care facility, branch circuits must be installed using a method that provides an effective ground-fault current path. Which of the following meets this requirement per NEC Article 517?

Accepted Answer

A metal raceway or a cable with a metallic armor or sheath.

Answer

Type NM cable with an equipment grounding conductor.

Answer

PVC conduit with an insulated copper equipment grounding conductor.

Answer

Direct-burial cable run concealed in the wall.