Alabama Electrical Contractor Licensing
Exam Practice Test Questions and
Correct Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
Download Pdf.
1. According to the National Electrical Code (NEC), the primary
purpose of overcurrent protection devices is to:
A. Increase circuit voltage
B. Improve power factor
C. Protect conductors and equipment from excessive current
D. Reduce electrical resistance
Rationale: Overcurrent protection devices such as fuses and circuit
breakers are designed to interrupt excessive current caused by overloads
or short circuits, preventing damage to conductors, equipment, and
electrical systems.
2. In Alabama, an electrical contractor license generally allows a
contractor to:
A. Perform only residential wiring
B. Install plumbing systems
C. Perform electrical work for compensation within the scope allowed
,by the license
D. Inspect electrical installations only
Rationale: An electrical contractor license authorizes qualified
individuals or businesses to perform electrical installations and related
work according to Alabama licensing requirements.
3. The standard voltage supplied to most residential single-phase
services in the United States is:
A. 120/208 volts
B. 277/480 volts
C. 120/240 volts
D. 480/600 volts
Rationale: Most residential services use a 120/240-volt single-phase
system with two ungrounded conductors and a grounded neutral
conductor.
4. The NEC requires that electrical installations be:
A. Installed using only aluminum conductors
B. Hidden from inspectors
C. Installed in a manner that is safe and suitable for their intended use
D. Designed without grounding systems
Rationale: NEC requirements focus on safety, proper installation
methods, and protection against electrical hazards.
,5. A conductor that carries current back to the source under normal
operation is called the:
A. Equipment grounding conductor
B. Bonding jumper
C. Grounded conductor (neutral conductor)
D. Grounding electrode conductor
Rationale: The grounded conductor, commonly called the neutral,
provides the return path for current in many electrical circuits.
6. What is the minimum rating commonly required for a general-
purpose residential branch circuit?
A. 10 amperes
B. 15 amperes
C. 25 amperes
D. 40 amperes
Rationale: Residential general-purpose branch circuits are commonly
rated at 15 or 20 amperes, with 15 amperes being the minimum
standard size.
7. A circuit breaker protects a circuit by:
A. Increasing conductor size
B. Reducing electrical demand
C. Opening the circuit when excessive current flows
D. Preventing voltage drop completely
, Rationale: Circuit breakers automatically interrupt current flow when
they detect overload or short-circuit conditions.
8. The formula used to calculate electrical power is:
A. P = R ÷ I
B. P = V ÷ I
C. P = V × I
D. P = I ÷ R
Rationale: Electrical power in watts is calculated by multiplying voltage
(V) by current (I).
9. A GFCI device is designed primarily to protect against:
A. High voltage transmission faults
B. Ground-fault shock hazards
C. Low power factor
D. Motor overheating only
Rationale: Ground-fault circuit interrupters detect small current
imbalances and disconnect power to reduce the risk of electric shock.
10. The purpose of an equipment grounding conductor is to:
A. Carry normal circuit current
B. Increase voltage
C. Provide a low-impedance path for fault current
D. Replace the neutral conductor
Exam Practice Test Questions and
Correct Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
Download Pdf.
1. According to the National Electrical Code (NEC), the primary
purpose of overcurrent protection devices is to:
A. Increase circuit voltage
B. Improve power factor
C. Protect conductors and equipment from excessive current
D. Reduce electrical resistance
Rationale: Overcurrent protection devices such as fuses and circuit
breakers are designed to interrupt excessive current caused by overloads
or short circuits, preventing damage to conductors, equipment, and
electrical systems.
2. In Alabama, an electrical contractor license generally allows a
contractor to:
A. Perform only residential wiring
B. Install plumbing systems
C. Perform electrical work for compensation within the scope allowed
,by the license
D. Inspect electrical installations only
Rationale: An electrical contractor license authorizes qualified
individuals or businesses to perform electrical installations and related
work according to Alabama licensing requirements.
3. The standard voltage supplied to most residential single-phase
services in the United States is:
A. 120/208 volts
B. 277/480 volts
C. 120/240 volts
D. 480/600 volts
Rationale: Most residential services use a 120/240-volt single-phase
system with two ungrounded conductors and a grounded neutral
conductor.
4. The NEC requires that electrical installations be:
A. Installed using only aluminum conductors
B. Hidden from inspectors
C. Installed in a manner that is safe and suitable for their intended use
D. Designed without grounding systems
Rationale: NEC requirements focus on safety, proper installation
methods, and protection against electrical hazards.
,5. A conductor that carries current back to the source under normal
operation is called the:
A. Equipment grounding conductor
B. Bonding jumper
C. Grounded conductor (neutral conductor)
D. Grounding electrode conductor
Rationale: The grounded conductor, commonly called the neutral,
provides the return path for current in many electrical circuits.
6. What is the minimum rating commonly required for a general-
purpose residential branch circuit?
A. 10 amperes
B. 15 amperes
C. 25 amperes
D. 40 amperes
Rationale: Residential general-purpose branch circuits are commonly
rated at 15 or 20 amperes, with 15 amperes being the minimum
standard size.
7. A circuit breaker protects a circuit by:
A. Increasing conductor size
B. Reducing electrical demand
C. Opening the circuit when excessive current flows
D. Preventing voltage drop completely
, Rationale: Circuit breakers automatically interrupt current flow when
they detect overload or short-circuit conditions.
8. The formula used to calculate electrical power is:
A. P = R ÷ I
B. P = V ÷ I
C. P = V × I
D. P = I ÷ R
Rationale: Electrical power in watts is calculated by multiplying voltage
(V) by current (I).
9. A GFCI device is designed primarily to protect against:
A. High voltage transmission faults
B. Ground-fault shock hazards
C. Low power factor
D. Motor overheating only
Rationale: Ground-fault circuit interrupters detect small current
imbalances and disconnect power to reduce the risk of electric shock.
10. The purpose of an equipment grounding conductor is to:
A. Carry normal circuit current
B. Increase voltage
C. Provide a low-impedance path for fault current
D. Replace the neutral conductor
