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

The NEC permits electric heating equipment in hazardous locations, but the allowable voltage and installation requirements depend on the specific class, division, and group classification.

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

NEC Article 517.31 requires the life safety branch to have power restored automatically within 10 seconds of utility power interruption.

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

Standard NM (nonmetallic-sheathed) cable is not permitted in Class I, Division 2 locations; approved methods include rigid metal conduit, IMC, and listed MC cable with gas-tight fittings.

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

NEC 517.13 requires redundant grounding in patient care areas, mandating both a metallic raceway or cable armor and an insulated copper equipment grounding conductor.

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

NEC 680.8 requires that overhead service conductors maintain a minimum horizontal distance of 22.5 feet from the inside wall of a pool.

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