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

Equipment in Class I, Division 1 must be explosion-proof, intrinsically safe, purged/pressurized, or another method approved by NEC Article 501.

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

NEC 501.10(A)(1) requires at least 5 threads fully engaged for threaded conduit joints in Class I, Division 1 to maintain explosion-proof integrity.

Question 3

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

Accepted Answer

Listed explosion-proof flexible fittings

Answer

Flexible connections in Class I, Division 1 require listed explosion-proof flexible fittings to maintain the required hazardous location rating.

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

Seals prevent the passage of gases, vapors, or flames through the conduit system and minimize pressure piling from internal explosions per NEC 501.15.

Question 5

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

Accepted Answer

Open wiring on insulators

Answer

Open wiring on insulators exposes conductors to the hazardous atmosphere and is prohibited; enclosed wiring methods such as RMC, IMC, or listed cable assemblies are required.

Journeyman Electrician’s Exam Practice Test

Journeyman Electrician’s Exam Practice Test

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