Journeyman Electrician’s Exam Wiring Methods and Materials 1 — Questions and Answers
Question 1: Per NEC Chapter 9 Table 1, what is the maximum conduit fill percentage when 4 or more conductors are installed?
- 40% (Correct answer)
- 53%
- 31%
- 60%
Correct answer: 40%
NEC Chapter 9, Table 1 limits conduit fill to 40% of the cross-sectional area when 4 or more conductors are installed.
Question 2: Which cable type is NOT permitted for use in wet or damp locations?
- Rigid metal conduit (RMC)
- Type MC cable
- Type NM cable (Correct answer)
- Liquidtight flexible metal conduit (LFMC)
Correct answer: Type NM cable
Type NM (Romex) cable is only listed for use in dry locations and is prohibited in wet or damp environments.
Question 3: Per NEC Table 300.5, what is the minimum cover requirement for RMC installed beneath a one- or two-family dwelling driveway?
- 6 inches (Correct answer)
- 12 inches
- 18 inches
- 24 inches
Correct answer: 6 inches
NEC Table 300.5 requires only 6 inches of cover for RMC under a one- or two-family dwelling driveway due to its mechanical strength.
Question 4: Per NEC 350.30(A), what is the maximum length of flexible metal conduit (FMC) permitted when used as a luminaire whip?
- 3 feet
- 4 feet
- 6 feet (Correct answer)
- 8 feet
Correct answer: 6 feet
NEC 350.30(A) limits FMC used as a fixture whip to a maximum length of 6 feet.
Question 5: Which cable type is specifically listed and permitted for installation in a cable tray system?
- Type NM
- Type SE
- Type MC (Correct answer)
- Type UF
Correct answer: Type MC
Type MC (Metal-Clad) cable is listed for use in cable tray systems per NEC Article 392 and 330.
Question 6: What is the minimum trade size for electrical metallic tubing (EMT) per NEC 358.20?
- 1/2 inch (Correct answer)
- 3/8 inch
- 1/4 inch
- 3/4 inch
Correct answer: 1/2 inch
Per NEC 358.20, EMT is manufactured and permitted in trade sizes starting at 1/2 inch minimum.
Journeyman Electrician’s Exam Wiring Methods and Materials 1
Per NEC Chapter 9 Table 1, what is the maximum conduit fill percentage when 4 or more conductors are installed?