Wiring Methods and Materials Flashcards
6 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 6 Wiring Methods and Materials flashcards as text
What distinguishes Type AC cable from Type MC cable regarding the equipment ground?
Answer: AC contains an internal bonding strip and relies on the armor for grounding
Type AC cable uses an internal aluminum bonding strip working with the armor as the equipment ground, while Type MC cable contains a dedicated EGC wire.
Type UF cable is specifically designed and listed for which primary application?
Answer: Direct burial underground
Type UF (Underground Feeder) cable is listed for direct burial and is rated for continuous exposure to moisture underground.
Per NEC Table 310.16, what is the ampacity of a 12 AWG copper conductor with 90°C (THHN) insulation in a raceway?
Answer: 25 amperes
NEC Table 310.16 lists 12 AWG copper in the 90°C column at 25 amperes, though termination limits often restrict use to 20A.
When flexible metal conduit (FMC) exceeds 6 feet in length, what additional grounding measure is required?
Answer: A separate equipment grounding conductor inside the FMC
Per NEC 350.60, FMC longer than 6 feet cannot serve as the sole equipment ground; a separate EGC must be installed inside.
Per NEC 330.30, at what maximum interval must Type MC cable be supported when installed on structural members?
Answer: 6 feet
NEC 330.30 requires Type MC cable to be supported and secured at intervals not exceeding 6 feet.
Which wiring method is permitted in a Class I, Division 1 hazardous (classified) location?
Answer: Rigid metal conduit (RMC) with threaded fittings
RMC with threaded, explosionproof fittings is one of the wiring methods permitted in Class I, Division 1 locations per NEC 501.10(A).