OREGON SUPERVISING ELECTRICIAN 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+
1.
Under NEC rules, the minimum working clearance in front of electrical equipment
operating at 600 volts or less is:
A. 2 feet
B. 3 feet
C. 4 feet
D. 5 feet
Answer: B ✓ (3 feet)
Explanation: This is required by NEC 110.26 to ensure safe working space for
electrical maintenance and operation.
2.
Which conductor is permitted to be re-identified as grounded in a 3-wire system?
A. White
B. Green
,C. Bare copper
D. Red
Answer: A ✓ (White)
Explanation: The white conductor may be re-identified as a grounded conductor
when used in certain systems per NEC 200.7.
3.
The maximum number of 90-degree bends allowed between pull points is:
A. 2
B. 3
C. 4
D. 5
Answer: C ✓ (4)
Explanation: NEC limits total bends between pull points to 360 degrees to
prevent conductor damage and ease installation.
4.
A GFCI is designed primarily to protect against:
A. Overcurrent
B. Short circuits
C. Ground faults
D. Arc faults
Answer: C ✓ (Ground faults)
Explanation: GFCIs detect leakage current to ground and quickly disconnect
power to prevent shock hazards.
5.
,The standard voltage for residential single-phase service in the U.S. is typically:
A. 120/240V
B. 208/120V
C. 277/480V
D. 240/480V
Answer: A ✓ (120/240V)
Explanation: Most residential services in the U.S. use a split-phase 120/240V
system.
6.
Which device provides protection against arc-fault conditions?
A. GFCI
B. AFCI
C. Fuse
D. Disconnect switch
Answer: B ✓ (AFCI)
Explanation: AFCIs detect arcing conditions and interrupt power to prevent
electrical fires.
7.
The minimum burial depth for residential 120V UF cable is typically:
A. 6 inches
B. 12 inches
C. 18 inches
D. 24 inches
, Answer: C ✓ (18 inches)
Explanation: NEC Table 300.5 specifies burial depth requirements depending on
wiring method and voltage.
8.
The purpose of a bonding jumper is to:
A. Increase voltage
B. Provide overcurrent protection
C. Ensure electrical continuity
D. Reduce resistance in load
Answer: C ✓ (Ensure electrical continuity)
Explanation: Bonding jumpers maintain a continuous path for fault current to
facilitate breaker operation.
9.
What is the maximum overcurrent protection allowed for a 14 AWG copper
conductor?
A. 10A
B. 15A
C. 20A
D. 30A
Answer: B ✓ (15A)
Explanation: NEC limits 14 AWG copper conductors to 15 amperes for safety.
10.
A receptacle installed in a bathroom must be protected by:
Newest (2026 Update) Actual Practice
Questions – Set 100 Most Common Exam
Questions And Answers In Details 100%
Verified Exam Highly Recommendable For
Grade A+
1.
Under NEC rules, the minimum working clearance in front of electrical equipment
operating at 600 volts or less is:
A. 2 feet
B. 3 feet
C. 4 feet
D. 5 feet
Answer: B ✓ (3 feet)
Explanation: This is required by NEC 110.26 to ensure safe working space for
electrical maintenance and operation.
2.
Which conductor is permitted to be re-identified as grounded in a 3-wire system?
A. White
B. Green
,C. Bare copper
D. Red
Answer: A ✓ (White)
Explanation: The white conductor may be re-identified as a grounded conductor
when used in certain systems per NEC 200.7.
3.
The maximum number of 90-degree bends allowed between pull points is:
A. 2
B. 3
C. 4
D. 5
Answer: C ✓ (4)
Explanation: NEC limits total bends between pull points to 360 degrees to
prevent conductor damage and ease installation.
4.
A GFCI is designed primarily to protect against:
A. Overcurrent
B. Short circuits
C. Ground faults
D. Arc faults
Answer: C ✓ (Ground faults)
Explanation: GFCIs detect leakage current to ground and quickly disconnect
power to prevent shock hazards.
5.
,The standard voltage for residential single-phase service in the U.S. is typically:
A. 120/240V
B. 208/120V
C. 277/480V
D. 240/480V
Answer: A ✓ (120/240V)
Explanation: Most residential services in the U.S. use a split-phase 120/240V
system.
6.
Which device provides protection against arc-fault conditions?
A. GFCI
B. AFCI
C. Fuse
D. Disconnect switch
Answer: B ✓ (AFCI)
Explanation: AFCIs detect arcing conditions and interrupt power to prevent
electrical fires.
7.
The minimum burial depth for residential 120V UF cable is typically:
A. 6 inches
B. 12 inches
C. 18 inches
D. 24 inches
, Answer: C ✓ (18 inches)
Explanation: NEC Table 300.5 specifies burial depth requirements depending on
wiring method and voltage.
8.
The purpose of a bonding jumper is to:
A. Increase voltage
B. Provide overcurrent protection
C. Ensure electrical continuity
D. Reduce resistance in load
Answer: C ✓ (Ensure electrical continuity)
Explanation: Bonding jumpers maintain a continuous path for fault current to
facilitate breaker operation.
9.
What is the maximum overcurrent protection allowed for a 14 AWG copper
conductor?
A. 10A
B. 15A
C. 20A
D. 30A
Answer: B ✓ (15A)
Explanation: NEC limits 14 AWG copper conductors to 15 amperes for safety.
10.
A receptacle installed in a bathroom must be protected by:
