Licensed Electrical Contractor Licensed Electrical Contractor Special Occupancies and Equipment Questions and Answers 2

Question 1

Per NEC Article 517, what is the maximum time permitted for the emergency system to restore power to life safety circuits in a hospital?

Accepted Answer

10 seconds

Answer

30 seconds

Answer

60 seconds

Answer

120 seconds

Question 2

Which NEC article governs the installation of electrical systems in hazardous (classified) locations involving flammable gases or vapors?

Accepted Answer

Article 500

Answer

Article 517

Answer

Article 680

Answer

Article 550

Question 3

When installing a swimming pool underwater luminaire operating at more than 15 volts, what is the minimum burial depth for a rigid metal conduit run from the forming shell to the junction box?

Accepted Answer

18 inches

Answer

6 inches

Answer

12 inches

Answer

24 inches

Question 4

In a Class I, Division 1 hazardous location, which wiring method is generally required?

Accepted Answer

Threaded rigid metal conduit with explosion-proof fittings

Answer

Type NM cable with weatherproof connectors

Answer

Flexible metal conduit without seals

Answer

EMT with compression fittings

Question 5

What is the minimum required height for overhead service conductors crossing a commercial parking lot subject to truck traffic?

Accepted Answer

18 feet

Answer

12 feet

Answer

15 feet

Answer

20 feet

Question 6

Per NEC Article 680, what is the minimum equipotential bonding grid wire size required for a permanently installed swimming pool?

Accepted Answer

No. 8 AWG solid copper

Answer

No. 12 AWG solid copper

Answer

No. 10 AWG solid copper

Answer

No. 6 AWG solid copper