Licensed Electrical Contractor Special Occupancies and Equipment Questions and Answers

Question 1

For a legally required emergency system, what is the maximum time permitted by NEC 700.12 for the emergency power source to be connected to the load after a normal power failure?

Accepted Answer

10 seconds

Answer

NEC 700.12 requires that emergency systems have power available within a maximum of 10 seconds after the interruption of the normal supply. This ensures that critical life safety systems, such as egress lighting and fire alarms, are restored quickly.

Question 2

A 2-inch rigid metal conduit leaves a Class I, Division 1 hazardous location and enters an unclassified area. According to NEC 501.15(A)(4), where must the sealing fitting be located relative to the boundary?

Accepted Answer

On either side of the boundary, as close as practicable but no more than 10 feet from the boundary.

Answer

NEC 501.15(A)(4) requires a seal in each conduit run passing from a Class I, Division 1 location into an unclassified location. The sealing fitting is permitted to be installed on either side of the boundary within 10 feet of it and must be designed to minimize the passage of gases or vapors.

Question 3

Which of the following components is NOT required by NEC 680.26(B) to be bonded to the equipotential bonding grid for a permanently installed swimming pool?

Accepted Answer

A metal drinking fountain located 8 feet from the inside wall of the pool.

Answer

NEC 680.26(B) requires the bonding of various conductive parts. Specifically, 680.26(B)(7) requires bonding of all fixed metal parts within 5 feet horizontally of the inside walls of the pool. Since the metal drinking fountain is located 8 feet away, it is outside this specified bonding perimeter and is not required to be part of the equipotential grid.

Question 4

In a patient care vicinity of a hospital designated as a 'critical care (Category 1) space', which of the following is a specific requirement for branch circuits serving patient-care-related electrical equipment?

Accepted Answer

They must be wired with an insulated copper equipment grounding conductor in addition to the metal raceway.

Answer

NEC 517.13(A) and (B) mandate that in critical care spaces, branch circuits must be installed in a metal raceway or metal-sheathed cable that provides an effective ground-fault current path. In addition, an insulated copper equipment grounding conductor must be installed with the circuit conductors, creating a redundant grounding system for enhanced patient safety.

Question 5

According to NEC Article 625, what type of personnel protection is required for all 120-volt, single-phase, 15- and 20-ampere receptacles installed for the connection of electric vehicle charging equipment?

Accepted Answer

A ground-fault circuit-interrupter (GFCI) for personnel.

Answer

NEC 625.54 requires that all single-phase receptacles rated 150 volts to ground or less, and 50 amperes or less, installed for the connection of electric vehicle charging, must have ground-fault circuit-interrupter (GFCI) protection for personnel. This is in addition to other GFCI requirements found in Article 210.

Licensed Electrical Contractor Practice Test

Licensed Electrical Contractor Practice Test

Licensed Electrical Contractor Special Occupancies and Equipment Questions and Answers