E2 Hazardous (Classified) Locations 2

Question 1

In a Class I, Division 2 location, which wiring method is generally acceptable?

Accepted Answer

Rigid metal conduit (RMC)

Answer

Type NM cable

Answer

Open wiring on insulators

Answer

Type SE cable

Question 2

Which NEC article covers Class II hazardous locations involving combustible dust?

Accepted Answer

Article 502

Answer

Article 500

Answer

Article 501

Answer

Article 503

Question 3

What is the primary purpose of sealing fittings in Class I hazardous locations?

Accepted Answer

To prevent the passage of gases, vapors, or flames

Answer

To prevent moisture ingress

Answer

To support the conduit system

Answer

To allow for thermal expansion

Question 4

A spray paint booth where flammable liquids are used would typically be classified as which hazardous location?

Accepted Answer

Class I, Division 1

Answer

Class I, Division 2

Answer

Class II, Division 1

Answer

Class III, Division 1

Question 5

In the Zone classification system, Zone 0 corresponds most closely to which Division classification?

Accepted Answer

Division 1 only — continuous hazard

Answer

Division 2

Answer

A combination of Division 1 and 2

Answer

No direct equivalent exists

Question 6

Aluminum conduit is permitted in Class I hazardous locations under which condition?

Accepted Answer

When specifically listed for the hazardous location

Answer

Never; only steel conduit is permitted

Answer

In Division 2 locations only

Answer

When the trade size is 1 inch or larger

Question 7

Which of the following equipment markings indicates it is suitable for use in Class I, Division 1, Groups C and D locations?

Accepted Answer

CL I DIV 1 GP C,D

Answer

EXd IIC T3

Answer

Class I Zone 1 AEx d IIB

Answer

NEMA 4X