SOUTH DAKOTA ELECTRICAL CONTRACTOR EXAM
Newest (2026 Update) Actual Practice Questions – Set
100 Most Common Exam Questions And Answers In
Details 100% Verified Exam Highly Recommendable For
Grade A+
QUESTION 1
A dwelling unit branch circuit supplying general lighting loads is typically required
to be rated at:
A. 10 amperes
B. 15 or 20 amperes
C. 30 amperes only
D. 40 amperes minimum
Answer: B ✓
Rationale: General lighting circuits in dwelling units are commonly designed as
15A or 20A branch circuits per NEC dwelling standards.
QUESTION 2
The minimum burial depth for a rigid metal conduit installed under a residential
driveway is generally:
A. 6 inches
B. 12 inches
C. 18 inches
D. 24 inches
,Answer: C ✓
Rationale: Rigid metal conduit under residential driveways typically requires a
minimum cover of 18 inches per NEC Table 300.5.
QUESTION 3
Which device is primarily used to protect against ground-fault shock hazards in
wet locations?
A. AFCI
B. GFCI
C. Fuse
D. Thermal relay
Answer: B ✓
Rationale: A Ground-Fault Circuit Interrupter (GFCI) protects personnel from
shock in wet or damp environments.
QUESTION 4
The maximum voltage drop recommended for branch circuits is:
A. 1%
B. 3%
C. 5%
D. 10%
Answer: B ✓
Rationale: NEC recommends a maximum of 3% voltage drop on branch circuits
for efficient equipment operation.
QUESTION 5
Copper grounding electrode conductor size is determined primarily by:
,A. Service voltage
B. Largest ungrounded service conductor
C. Number of circuits
D. Load calculation only
Answer: B ✓
Rationale: Grounding electrode conductor sizing is based on the size of the
largest ungrounded service conductor.
QUESTION 6
A continuous load is defined as a load expected to operate at maximum current
for:
A. 30 minutes or more
B. 1 hour or more
C. 3 hours or more
D. 8 hours or more
Answer: C ✓
Rationale: A continuous load is one that runs at maximum current for three
hours or longer.
QUESTION 7
Which conductor is typically used for equipment grounding?
A. Bare copper or green-insulated conductor
B. White conductor
C. Red conductor
D. Orange conductor
Answer: A ✓
Rationale: Equipment grounding conductors are identified as bare copper or
green insulation per NEC rules.
, QUESTION 8
The main purpose of a disconnecting means is to:
A. Increase voltage stability
B. Provide overcurrent protection
C. Isolate equipment from power supply
D. Reduce harmonic distortion
Answer: C ✓
Rationale: A disconnect safely isolates equipment from its power source for
maintenance or emergencies.
QUESTION 9
Minimum working clearance in front of electrical equipment rated 120/240V is:
A. 2 feet
B. 2.5 feet
C. 3 feet
D. 4 feet
Answer: C ✓
Rationale: NEC requires at least 3 feet of working clearance in front of 120/240V
equipment.
QUESTION 10
Which of the following is NOT an overcurrent protective device?
A. Circuit breaker
B. Fuse
C. Relay
D. Ground rod
Newest (2026 Update) Actual Practice Questions – Set
100 Most Common Exam Questions And Answers In
Details 100% Verified Exam Highly Recommendable For
Grade A+
QUESTION 1
A dwelling unit branch circuit supplying general lighting loads is typically required
to be rated at:
A. 10 amperes
B. 15 or 20 amperes
C. 30 amperes only
D. 40 amperes minimum
Answer: B ✓
Rationale: General lighting circuits in dwelling units are commonly designed as
15A or 20A branch circuits per NEC dwelling standards.
QUESTION 2
The minimum burial depth for a rigid metal conduit installed under a residential
driveway is generally:
A. 6 inches
B. 12 inches
C. 18 inches
D. 24 inches
,Answer: C ✓
Rationale: Rigid metal conduit under residential driveways typically requires a
minimum cover of 18 inches per NEC Table 300.5.
QUESTION 3
Which device is primarily used to protect against ground-fault shock hazards in
wet locations?
A. AFCI
B. GFCI
C. Fuse
D. Thermal relay
Answer: B ✓
Rationale: A Ground-Fault Circuit Interrupter (GFCI) protects personnel from
shock in wet or damp environments.
QUESTION 4
The maximum voltage drop recommended for branch circuits is:
A. 1%
B. 3%
C. 5%
D. 10%
Answer: B ✓
Rationale: NEC recommends a maximum of 3% voltage drop on branch circuits
for efficient equipment operation.
QUESTION 5
Copper grounding electrode conductor size is determined primarily by:
,A. Service voltage
B. Largest ungrounded service conductor
C. Number of circuits
D. Load calculation only
Answer: B ✓
Rationale: Grounding electrode conductor sizing is based on the size of the
largest ungrounded service conductor.
QUESTION 6
A continuous load is defined as a load expected to operate at maximum current
for:
A. 30 minutes or more
B. 1 hour or more
C. 3 hours or more
D. 8 hours or more
Answer: C ✓
Rationale: A continuous load is one that runs at maximum current for three
hours or longer.
QUESTION 7
Which conductor is typically used for equipment grounding?
A. Bare copper or green-insulated conductor
B. White conductor
C. Red conductor
D. Orange conductor
Answer: A ✓
Rationale: Equipment grounding conductors are identified as bare copper or
green insulation per NEC rules.
, QUESTION 8
The main purpose of a disconnecting means is to:
A. Increase voltage stability
B. Provide overcurrent protection
C. Isolate equipment from power supply
D. Reduce harmonic distortion
Answer: C ✓
Rationale: A disconnect safely isolates equipment from its power source for
maintenance or emergencies.
QUESTION 9
Minimum working clearance in front of electrical equipment rated 120/240V is:
A. 2 feet
B. 2.5 feet
C. 3 feet
D. 4 feet
Answer: C ✓
Rationale: NEC requires at least 3 feet of working clearance in front of 120/240V
equipment.
QUESTION 10
Which of the following is NOT an overcurrent protective device?
A. Circuit breaker
B. Fuse
C. Relay
D. Ground rod
