E2 Special Occupancies 2

Question 1

In a Class I, Division 1 location, which wiring method is specifically permitted by the NEC?

Accepted Answer

Threaded rigid metal conduit (RMC) with listed fittings

Answer

NEC Article 501 requires threaded RMC or threaded steel intermediate metal conduit with listed fittings in Class I, Division 1 locations.

Question 2

Which of the following best describes a Class II, Division 1 location under NEC Article 502?

Accepted Answer

An area where combustible dust is in suspension in the air under normal operating conditions

Answer

Class II, Division 1 locations have combustible dust in suspension in the air continuously or intermittently under normal operating conditions.

Question 3

Under NEC Article 504, an intrinsically safe system is one in which any spark or thermal effect is incapable of causing ignition under which condition?

Accepted Answer

Both normal and abnormal conditions as specified

Answer

Article 504 defines intrinsically safe systems as those where no spark or thermal effect can cause ignition under both normal and specified abnormal conditions.

Question 4

In a Class I, Zone 0 location per NEC Article 505, flammable concentrations of gases are present:

Accepted Answer

Continuously or for long periods under normal conditions

Answer

Zone 0 is the most hazardous classification under the Zone system, where flammable concentrations are present continuously or for long periods.

Question 5

When sealing fittings are required in a Class I conduit system at a boundary, where must the seal be installed?

Accepted Answer

Within 18 inches of the enclosure

Answer

NEC 501.15 requires seals in Class I, Division 1 locations to be within 18 inches of the enclosure.

(E2) E2 Commercial Electrical Inspector Practice Test

(E2) E2 Commercial Electrical Inspector Practice Test

E2 Special Occupancies 2