Journeyman Electrician's Hazardous Locations Flashcards
7 cards from real Journeyman Electrician’s Exam practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Journeyman Electrician's Hazardous Locations flashcards as text
Equipment installed in Class I, Division 1 locations must be listed as:
Answer: Explosion-proof or intrinsically safe
Equipment in Class I, Division 1 must be explosion-proof, intrinsically safe, purged/pressurized, or another method approved by NEC Article 501.
Threaded rigid metal conduit joints in Class I, Division 1 locations must have a minimum of how many threads fully engaged?
Answer: 5 threads
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.
Flexible connections in Class I, Division 1 locations must use:
Answer: Listed explosion-proof flexible fittings
Flexible connections in Class I, Division 1 require listed explosion-proof flexible fittings to maintain the required hazardous location rating.
The primary purpose of sealing fittings in Class I hazardous locations is to:
Answer: Prevent passage of gases, vapors, or flames through the conduit system
Seals prevent the passage of gases, vapors, or flames through the conduit system and minimize pressure piling from internal explosions per NEC 501.15.
Which wiring method is generally NOT permitted in Class I, Division 2 locations?
Answer: Open wiring on insulators
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.
Per NEC 501.15(A)(1), sealing fittings must be installed within how many inches of an explosion-proof enclosure?
Answer: 18 inches
Seals must be placed within 18 inches of explosion-proof enclosures to prevent the conduit from acting as a flame or pressure passage.
The sealing compound used in Class I hazardous location seals must:
Answer: Not shrink or crack and be listed for the purpose
NEC 501.15(C)(2) requires sealing compound that will not shrink or crack and is listed for the purpose to permanently maintain seal integrity.