E2 Hazardous (Classified) Locations 3

Question 1

Flexible connections in Class I, Division 1 locations must use which type of flexible fitting?

Accepted Answer

Listed flexible fittings approved for the location

Answer

Flexible connections in Class I, Division 1 locations must use listed flexible fittings specifically approved for use in that classified location.

Question 2

In a Class II, Division 1 location, motors must be of which type?

Accepted Answer

Dust-ignition-proof

Answer

Motors in Class II, Division 1 locations must be dust-ignition-proof to prevent ignition of combustible dust accumulations.

Question 3

What is the maximum distance from a Class I, Division 1 or 2 enclosure that a conduit seal must be installed?

Accepted Answer

18 inches

Answer

NEC Section 501.15 requires conduit seals to be installed within 18 inches of a Class I, Division 1 or 2 enclosure.

Question 4

Which Group classification covers acetylene in Class I hazardous locations?

Accepted Answer

Group A

Answer

Acetylene is classified in Group A, which represents the most sensitive and dangerous gas group in Class I locations.

Question 5

Intrinsically safe equipment is defined as equipment that:

Accepted Answer

Cannot produce sparks or thermal effects capable of igniting a hazardous mixture

Answer

Intrinsically safe equipment is incapable of releasing sufficient electrical or thermal energy under normal or abnormal conditions to cause ignition of a specific hazardous atmospheric mixture.

(E2) E2 Commercial Electrical Inspector Practice Test

(E2) E2 Commercial Electrical Inspector Practice Test

E2 Hazardous (Classified) Locations 3