Alabama Journeyman Electrician
Certification Practice Exam Newest (2026
Update) Actual Practice Questions – Set
100 Most Common Exam Questions And
Answers In Details 100% Verified Exam
1. What is the primary purpose of grounding in an electrical system?
A. Increase voltage
B. Provide a path for fault current
C. Reduce resistance
D. Improve efficiency
✔ Correct Answer: B (Provide a path for fault current)
Grounding ensures safety by directing fault current safely to earth,
preventing electric shock and equipment damage.
2. According to NEC, what is the minimum cover depth for direct-buried
residential branch circuits rated 120V or less with GFCI protection?
A. 6 inches
B. 12 inches
C. 18 inches
D. 24 inches
✔ Correct Answer: B (12 inches)
The NEC allows reduced burial depth when circuits are GFCI protected and
meet specific conditions.
3. What device is used to protect against overcurrent in a circuit?
A. Transformer
B. Capacitor
C. Circuit breaker
, D. Relay
✔ Correct Answer: C (Circuit breaker)
Circuit breakers automatically interrupt current flow during overloads or
short circuits.
4. What is the maximum number of conductors allowed in a 4-inch square box
with a volume of 21 cubic inches using 12 AWG wire?
A. 7
B. 8
C. 9
D. 10
✔ Correct Answer: B (8)
Each 12 AWG conductor requires 2.25 cubic inches; calculations limit the
total conductor count.
5. Which NEC article covers grounding and bonding requirements?
A. Article 210
B. Article 250
C. Article 300
D. Article 400
✔ Correct Answer: B (Article 250)
Article 250 outlines all grounding and bonding rules for electrical
installations.
6. What is Ohm’s Law formula?
A. V = IR
B. P = VI
C. I = PR
D. V = P/R
✔ Correct Answer: A (V = IR)
Ohm’s Law defines the relationship between voltage, current, and
resistance.
, 7. What type of conduit is most resistant to corrosion?
A. EMT
B. RMC
C. PVC
D. IMC
✔ Correct Answer: C (PVC)
PVC conduit is non-metallic and highly resistant to corrosion and
moisture.
8. What is the standard voltage for residential outlets in the U.S.?
A. 110V
B. 120V
C. 220V
D. 240V
✔ Correct Answer: B (120V)
Standard branch circuits in U.S. homes operate at 120 volts.
9. A continuous load is defined as a load where the maximum current is
expected to continue for how long?
A. 1 hour
B. 2 hours
C. 3 hours or more
D. 4 hours
✔ Correct Answer: C (3 hours or more)
The NEC defines continuous loads as those operating for three hours or
longer.
10.What color is typically used for grounding conductors?
A. Red
B. Black
C. Green
D. Blue
✔ Correct Answer: C (Green)
Green or bare conductors are designated for grounding purposes.
Certification Practice Exam Newest (2026
Update) Actual Practice Questions – Set
100 Most Common Exam Questions And
Answers In Details 100% Verified Exam
1. What is the primary purpose of grounding in an electrical system?
A. Increase voltage
B. Provide a path for fault current
C. Reduce resistance
D. Improve efficiency
✔ Correct Answer: B (Provide a path for fault current)
Grounding ensures safety by directing fault current safely to earth,
preventing electric shock and equipment damage.
2. According to NEC, what is the minimum cover depth for direct-buried
residential branch circuits rated 120V or less with GFCI protection?
A. 6 inches
B. 12 inches
C. 18 inches
D. 24 inches
✔ Correct Answer: B (12 inches)
The NEC allows reduced burial depth when circuits are GFCI protected and
meet specific conditions.
3. What device is used to protect against overcurrent in a circuit?
A. Transformer
B. Capacitor
C. Circuit breaker
, D. Relay
✔ Correct Answer: C (Circuit breaker)
Circuit breakers automatically interrupt current flow during overloads or
short circuits.
4. What is the maximum number of conductors allowed in a 4-inch square box
with a volume of 21 cubic inches using 12 AWG wire?
A. 7
B. 8
C. 9
D. 10
✔ Correct Answer: B (8)
Each 12 AWG conductor requires 2.25 cubic inches; calculations limit the
total conductor count.
5. Which NEC article covers grounding and bonding requirements?
A. Article 210
B. Article 250
C. Article 300
D. Article 400
✔ Correct Answer: B (Article 250)
Article 250 outlines all grounding and bonding rules for electrical
installations.
6. What is Ohm’s Law formula?
A. V = IR
B. P = VI
C. I = PR
D. V = P/R
✔ Correct Answer: A (V = IR)
Ohm’s Law defines the relationship between voltage, current, and
resistance.
, 7. What type of conduit is most resistant to corrosion?
A. EMT
B. RMC
C. PVC
D. IMC
✔ Correct Answer: C (PVC)
PVC conduit is non-metallic and highly resistant to corrosion and
moisture.
8. What is the standard voltage for residential outlets in the U.S.?
A. 110V
B. 120V
C. 220V
D. 240V
✔ Correct Answer: B (120V)
Standard branch circuits in U.S. homes operate at 120 volts.
9. A continuous load is defined as a load where the maximum current is
expected to continue for how long?
A. 1 hour
B. 2 hours
C. 3 hours or more
D. 4 hours
✔ Correct Answer: C (3 hours or more)
The NEC defines continuous loads as those operating for three hours or
longer.
10.What color is typically used for grounding conductors?
A. Red
B. Black
C. Green
D. Blue
✔ Correct Answer: C (Green)
Green or bare conductors are designated for grounding purposes.
