Journeyman Electrician’s Exam Wiring Methods and Materials 2

Question 1

What distinguishes Type AC cable from Type MC cable regarding the equipment ground?

Accepted Answer

AC contains an internal bonding strip and relies on the armor for grounding

Answer

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.

Question 2

Type UF cable is specifically designed and listed for which primary application?

Accepted Answer

Direct burial underground

Answer

Type UF (Underground Feeder) cable is listed for direct burial and is rated for continuous exposure to moisture underground.

Question 3

Per NEC Table 310.16, what is the ampacity of a 12 AWG copper conductor with 90°C (THHN) insulation in a raceway?

Accepted Answer

25 amperes

Answer

NEC Table 310.16 lists 12 AWG copper in the 90°C column at 25 amperes, though termination limits often restrict use to 20A.

Question 4

When flexible metal conduit (FMC) exceeds 6 feet in length, what additional grounding measure is required?

Accepted Answer

A separate equipment grounding conductor inside the FMC

Answer

Per NEC 350.60, FMC longer than 6 feet cannot serve as the sole equipment ground; a separate EGC must be installed inside.

Question 5

Per NEC 330.30, at what maximum interval must Type MC cable be supported when installed on structural members?

Accepted Answer

6 feet

Answer

NEC 330.30 requires Type MC cable to be supported and secured at intervals not exceeding 6 feet.

Journeyman Electrician’s Exam Practice Test

Journeyman Electrician’s Exam Practice Test

Journeyman Electrician’s Exam Wiring Methods and Materials 2