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

Question 1

What is the maximum voltage permitted for fixed electric space-heating equipment installed in a hazardous (classified) location per NEC Article 500?

Accepted Answer

Voltage depends on the class and division

Answer

600 volts

Answer

1000 volts

Answer

Equipment is prohibited in hazardous locations

Question 2

Per NEC Article 517, what is the maximum time permitted for the life safety branch of an essential electrical system in a healthcare facility to restore power after a utility outage?

Accepted Answer

10 seconds

Answer

30 seconds

Answer

60 seconds

Answer

15 seconds

Question 3

When installing wiring in a commercial garage classified as a Class I, Division 2 location, which wiring method is NOT permitted?

Accepted Answer

Standard NM cable

Answer

Rigid metal conduit

Answer

Type MC cable with gas-tight jacket

Answer

Intermediate metal conduit

Question 4

What grounding requirement applies to patient care vicinity receptacles in a healthcare facility per NEC Article 517?

Accepted Answer

Redundant grounding path using two equipment grounding conductors

Answer

Standard equipment grounding conductor only

Answer

Isolated ground only

Answer

No grounding is required if GFCI protected

Question 5

In a swimming pool area, what is the minimum distance an overhead service conductor must maintain from the pool edge per NEC Article 680?

Accepted Answer

22.5 feet horizontally

Answer

10 feet horizontally

Answer

15 feet horizontally

Answer

No overhead conductors are permitted near pools

Question 6

What type of ground-fault protection is required for a 15-ampere, 125-volt receptacle installed outdoors at a commercial occupancy per NEC Article 210?

Accepted Answer

GFCI protection

Answer

AFCI protection

Answer

Both GFCI and AFCI protection

Answer

No special protection required