FREE Licensed Electrical Contractor Special Occupancies and Equipment Questions and Answers

Question 1

An electrician is installing an explosion-proof light fixture in a paint spray booth, which is classified as a Class I, Division 1 location.
Which of the following wiring methods is permitted for connecting the fixture within this hazardous location?

Accepted Answer

Threaded rigid metal conduit (RMC) with appropriate seals.

Answer

Type NM cable concealed in the wall.

Answer

Electrical metallic tubing (EMT) with compression fittings.

Answer

Type MC cable with a standard connector.

Question 2

According to NEC Article 680, what is the GFCI protection requirement for a single-phase, 240-volt motor for a permanently installed swimming pool?

Accepted Answer

GFCI protection is required for all outlets supplying pool motors connected to single-phase, 120-volt through 240-volt branch circuits.

Answer

GFCI protection is not required if the motor is hardwired.

Answer

GFCI protection is only required for 120-volt cord-and-plug-connected motors.

Answer

GFCI protection is only required if the motor is located within 5 feet of the pool's edge.

Question 3

In a hospital designated as a critical care (Category 1) space, which of the following loads would be required to be connected to the critical branch of the Essential Electrical System (EES)?

Accepted Answer

Receptacles and fixed equipment in the operating room.

Answer

The primary HVAC system for the building.

Answer

General hallway lighting.

Answer

The hospital's main data processing center.

Question 4

A contractor is installing four Level 2 Electric Vehicle Supply Equipment (EVSE) units in a commercial garage. Each unit has a maximum continuous rating of 32A at 240V. According to NEC Article 625, what is the calculated load for the feeder supplying these four units?

Accepted Answer

160A

Answer

128A

Answer

102.4A

Answer

80A

Question 5

In a commercial major repair garage where service is performed on gasoline-powered vehicles, and assuming standard ventilation is not provided, how is the area from the floor up to a level of 18 inches above the floor classified?

Accepted Answer

The area is a Class I, Division 2 location.

Answer

The area is unclassified.

Answer

The area is a Class I, Division 1 location.

Answer

The area is a Class II, Division 2 location.

Question 6

What is a primary requirement of a rapid shutdown system for a rooftop solar PV system, according to NEC Article 690.12, designed to enhance firefighter safety?

Accepted Answer

To reduce the voltage of controlled conductors OUTSIDE the array boundary to not more than 30 volts within 30 seconds of initiation.

Answer

To automatically disconnect the PV system from the utility grid during a power outage.

Answer

To provide a local disconnect for individual solar panels for maintenance purposes.

Answer

To de-energize the service entrance conductors supplying the main building.

An electrician is installing an explosion-proof light fixture in a paint spray booth, which is classified as a Class I, Division 1 location.Which of the following wiring methods is permitted for connecting the fixture within this hazardous location?

An electrician is installing an explosion-proof light fixture in a paint spray booth, which is classified as a Class I, Division 1 location.
Which of the following wiring methods is permitted for connecting the fixture within this hazardous location?