EL-1J Electrical Distribution
Journeyman Exam – Practice
Questions And Correct Answers
(Verified Answers) Plus Rationales
2026 Q&A | Instant Download Pdf
1. What is the primary purpose of a distribution transformer?
A. Convert DC to AC
B. Step up voltage for transmission
C. Step down voltage for utilization **
D. Store electrical energy
Distribution transformers reduce high transmission voltages to levels
suitable for residential or commercial use.
2. A feeder is defined as:
A. A device used to measure current
B. A conductor that carries power from the service equipment to
the branch circuits **
C. A backup generator
D. A device that steps up voltage
Feeders carry electrical power from the main service to subpanels or
branch circuits, without intermediate taps for utilization.
3. What is the standard color for grounding conductors in the U.S.?
A. Red
B. White
, C. Green **
D. Blue
Grounding conductors are typically green or bare to indicate their safety
function.
4. In a three-phase, four-wire system, the line-to-line voltage is 208
V. What is the line-to-neutral voltage?
A. 120 V **
B. 208 V
C. 240 V
D. 480 V
Line-to-neutral voltage is calculated by dividing the line-to-line voltage by
√3: 208 ÷ 1.732 ≈ 120 V.
5. What type of overcurrent protection device is typically used for
branch circuits?
A. Fuse
B. Circuit breaker **
C. Contactor
D. Transformer
Circuit breakers are commonly used to protect branch circuits from
overcurrent conditions.
6. Which NEC article covers grounding and bonding?
A. Article 210
B. Article 250 **
C. Article 310
D. Article 400
Article 250 of the National Electrical Code (NEC) specifies grounding
and bonding requirements.
, 7. Which conductor material has the highest conductivity?
A. Aluminum
B. Copper **
C. Steel
D. Iron
Copper has higher conductivity than aluminum, making it more efficient
for most electrical applications.
8. What is the minimum height for overhead service conductors
above residential driveways?
A. 10 feet
B. 12 feet **
C. 15 feet
D. 18 feet
NEC requires a minimum clearance of 12 feet over residential
driveways for safety.
9. What does a lightning arrester protect?
A. Low-voltage circuits
B. High-voltage circuits from overcurrent
C. Electrical equipment from voltage surges **
D. Transformers from overloads
Lightning arresters protect electrical equipment from transient
overvoltages caused by lightning.
10. What is the purpose of a capacitor bank in a distribution
system?
A. Step down voltage
B. Store energy for backup
C. Improve power factor **
D. Protect from overloads
Journeyman Exam – Practice
Questions And Correct Answers
(Verified Answers) Plus Rationales
2026 Q&A | Instant Download Pdf
1. What is the primary purpose of a distribution transformer?
A. Convert DC to AC
B. Step up voltage for transmission
C. Step down voltage for utilization **
D. Store electrical energy
Distribution transformers reduce high transmission voltages to levels
suitable for residential or commercial use.
2. A feeder is defined as:
A. A device used to measure current
B. A conductor that carries power from the service equipment to
the branch circuits **
C. A backup generator
D. A device that steps up voltage
Feeders carry electrical power from the main service to subpanels or
branch circuits, without intermediate taps for utilization.
3. What is the standard color for grounding conductors in the U.S.?
A. Red
B. White
, C. Green **
D. Blue
Grounding conductors are typically green or bare to indicate their safety
function.
4. In a three-phase, four-wire system, the line-to-line voltage is 208
V. What is the line-to-neutral voltage?
A. 120 V **
B. 208 V
C. 240 V
D. 480 V
Line-to-neutral voltage is calculated by dividing the line-to-line voltage by
√3: 208 ÷ 1.732 ≈ 120 V.
5. What type of overcurrent protection device is typically used for
branch circuits?
A. Fuse
B. Circuit breaker **
C. Contactor
D. Transformer
Circuit breakers are commonly used to protect branch circuits from
overcurrent conditions.
6. Which NEC article covers grounding and bonding?
A. Article 210
B. Article 250 **
C. Article 310
D. Article 400
Article 250 of the National Electrical Code (NEC) specifies grounding
and bonding requirements.
, 7. Which conductor material has the highest conductivity?
A. Aluminum
B. Copper **
C. Steel
D. Iron
Copper has higher conductivity than aluminum, making it more efficient
for most electrical applications.
8. What is the minimum height for overhead service conductors
above residential driveways?
A. 10 feet
B. 12 feet **
C. 15 feet
D. 18 feet
NEC requires a minimum clearance of 12 feet over residential
driveways for safety.
9. What does a lightning arrester protect?
A. Low-voltage circuits
B. High-voltage circuits from overcurrent
C. Electrical equipment from voltage surges **
D. Transformers from overloads
Lightning arresters protect electrical equipment from transient
overvoltages caused by lightning.
10. What is the purpose of a capacitor bank in a distribution
system?
A. Step down voltage
B. Store energy for backup
C. Improve power factor **
D. Protect from overloads
