Journeyman Electrician’s Exam Journeyman Electrician's Hazardous Locations 2

Question 1

Equipment installed in Class I, Division 1 locations must be listed as:

Accepted Answer

Explosion-proof or intrinsically safe

Answer

Weatherproof only

Answer

Dust-ignitionproof

Answer

GFCI protected

Question 2

Threaded rigid metal conduit joints in Class I, Division 1 locations must have a minimum of how many threads fully engaged?

Accepted Answer

5 threads

Answer

3 threads

Answer

7 threads

Answer

10 threads

Question 3

Flexible connections in Class I, Division 1 locations must use:

Accepted Answer

Listed explosion-proof flexible fittings

Answer

Standard liquid-tight flexible metal conduit

Answer

Standard flexible metal conduit with bonding jumper

Answer

PVC flexible conduit

Question 4

The primary purpose of sealing fittings in Class I hazardous locations is to:

Accepted Answer

Prevent passage of gases, vapors, or flames through the conduit system

Answer

Prevent moisture from entering conduit

Answer

Increase the mechanical strength of conduit joints

Answer

Provide an equipotential bonding point

Question 5

Which wiring method is generally NOT permitted in Class I, Division 2 locations?

Accepted Answer

Open wiring on insulators

Answer

Rigid metal conduit (RMC)

Answer

Intermediate metal conduit (IMC)

Answer

Type MI cable

Question 6

Per NEC 501.15(A)(1), sealing fittings must be installed within how many inches of an explosion-proof enclosure?

Accepted Answer

18 inches

Answer

6 inches

Answer

12 inches

Answer

24 inches

Question 7

The sealing compound used in Class I hazardous location seals must:

Accepted Answer

Not shrink or crack and be listed for the purpose

Answer

Be any commercially available caulk rated for 300°F

Answer

Be removable to allow future conductor changes

Answer

Be installed only after all conductors are pulled