E2 Special Occupancies 3

Question 1

Under NEC Article 511, in a commercial repair garage, the area within 18 inches above floor level is classified as:

Accepted Answer

Class I, Division 2

Answer

NEC 511.3 classifies the area up to 18 inches above floor level in commercial garages as Class I, Division 2 due to heavier-than-air gasoline vapors.

Question 2

In an aircraft hangar per NEC Article 513, the area within 5 feet horizontally from aircraft power plants is classified as:

Accepted Answer

Class I, Division 2

Answer

NEC 513.3 classifies areas within 5 feet horizontally from aircraft power plants and fuel tanks up to 5 feet above the upper surface as Class I, Division 2.

Question 3

At a motor fuel dispensing facility (gas station), the space within the dispenser enclosure and within 18 inches horizontally in all directions from the dispenser is classified as:

Accepted Answer

Class I, Division 1

Answer

NEC 514.3 classifies the interior of the dispenser enclosure and the 18-inch zone around it as Class I, Division 1.

Question 4

In spray application areas covered by NEC Article 516, the zone immediately surrounding open containers of flammable liquids is classified as:

Accepted Answer

Class I, Division 2 within 3 feet

Answer

NEC 516.3 classifies the area within 3 feet in all directions from open containers of flammable or combustible liquids as Class I, Division 2.

Question 5

Under NEC Article 511, electrical equipment in a pit or depression in a commercial garage floor is subject to which classification?

Accepted Answer

Class I, Division 1 throughout the entire pit

Answer

NEC 511.3 requires pits and depressions in commercial garages to be classified as Class I, Division 1 because heavier-than-air vapors accumulate there.

(E2) E2 Commercial Electrical Inspector Practice Test

(E2) E2 Commercial Electrical Inspector Practice Test

E2 Special Occupancies 3