Indiana Electrical Contractor
Examination — Local Jurisdiction
Practice Exam 2026 | 100 Questions &
Answers with Detailed Rationales |
Complete Exam Prep & Study Guide
1. What is the primary purpose of the National Electrical Code (NEC) in an
electrical installation?
A. To establish electrical utility rates
B. To provide practical safeguards for persons and property from hazards arising
from electricity
C. To regulate electrical contractor business taxes
D. To establish wholesale equipment prices
Answer: To provide practical safeguards for persons and property from hazards
arising from electricity
Rationale: The NEC establishes minimum safety requirements for electrical
installations. It is intended primarily to protect people and property from
electrical hazards rather than regulate business operations or utility pricing.
, 2. In a dwelling unit, what is the general maximum rating of a single
receptacle installed on an individual branch circuit rated 20 amperes?
A. 15 amperes
B. 20 amperes
C. 25 amperes
D. 30 amperes
Answer: 20 amperes
Rationale: A single receptacle on an individual branch circuit must generally
have a rating not less than the branch-circuit rating. A 20-ampere individual
circuit therefore requires a receptacle rated at least 20 amperes.
3. Which conductor is normally identified by a continuous white or gray
finish?
A. Ungrounded conductor
B. Equipment grounding conductor
C. Grounded conductor
D. Switched conductor
Answer: Grounded conductor
Rationale: The grounded conductor is generally identified by white or gray
insulation or markings. The identification rules help prevent confusion between
grounded, ungrounded, and grounding conductors.
4. What is the principal function of an equipment grounding conductor?
A. To carry normal circuit current
B. To increase circuit voltage
C. To provide a low-impedance path for fault current
D. To reduce the connected load
Answer: To provide a low-impedance path for fault current
,Rationale: The equipment grounding conductor provides an effective fault-
current path that permits overcurrent protective devices to operate promptly
when a fault occurs.
5. A 120/240-volt single-phase dwelling service has a calculated load of 150
amperes. What is the minimum service rating based solely on that
calculated load?
A. 100 amperes
B. 125 amperes
C. 150 amperes
D. 200 amperes
Answer: 150 amperes
Rationale: The service rating cannot be less than the calculated load. Other
requirements may cause a larger service to be selected, but the calculated load
establishes a minimum of 150 amperes in this example.
6. Which device is designed primarily to protect people from electric shock
caused by current flowing through an unintended path to ground?
A. AFCI
B. GFCI
C. Surge protective device
D. Disconnect switch
Answer: GFCI
Rationale: A ground-fault circuit-interrupter detects an imbalance between
current leaving and returning on the circuit conductors and opens the circuit
when the leakage reaches its trip threshold.
7. What is the purpose of an arc-fault circuit interrupter?
A. To regulate voltage
B. To protect against hazardous arcing conditions
, C. To increase available fault current
D. To replace all overcurrent protection
Answer: To protect against hazardous arcing conditions
Rationale: AFCIs are intended to detect dangerous arcing conditions and
interrupt the circuit before the arc can develop into a fire hazard.
8. A conductor supplying a continuous load must generally be sized so that
the ampacity is at least what percentage of the continuous load?
A. 80%
B. 100%
C. 110%
D. 125%
Answer: 125%
Rationale: Continuous loads are generally calculated at 125 percent for
conductor and overcurrent-protection sizing unless a specific provision permits
otherwise.
9. A circuit supplies a continuous load of 32 amperes. What minimum
ampacity is generally required for the conductors?
A. 32 amperes
B. 35 amperes
C. 40 amperes
D. 45 amperes
Answer: 40 amperes
Rationale: Thirty-two amperes multiplied by 125 percent equals 40 amperes.
The conductor ampacity must therefore generally be at least 40 amperes before
applicable adjustment and correction considerations.
10.Which condition is most likely to require conductor ampacity adjustment?
Examination — Local Jurisdiction
Practice Exam 2026 | 100 Questions &
Answers with Detailed Rationales |
Complete Exam Prep & Study Guide
1. What is the primary purpose of the National Electrical Code (NEC) in an
electrical installation?
A. To establish electrical utility rates
B. To provide practical safeguards for persons and property from hazards arising
from electricity
C. To regulate electrical contractor business taxes
D. To establish wholesale equipment prices
Answer: To provide practical safeguards for persons and property from hazards
arising from electricity
Rationale: The NEC establishes minimum safety requirements for electrical
installations. It is intended primarily to protect people and property from
electrical hazards rather than regulate business operations or utility pricing.
, 2. In a dwelling unit, what is the general maximum rating of a single
receptacle installed on an individual branch circuit rated 20 amperes?
A. 15 amperes
B. 20 amperes
C. 25 amperes
D. 30 amperes
Answer: 20 amperes
Rationale: A single receptacle on an individual branch circuit must generally
have a rating not less than the branch-circuit rating. A 20-ampere individual
circuit therefore requires a receptacle rated at least 20 amperes.
3. Which conductor is normally identified by a continuous white or gray
finish?
A. Ungrounded conductor
B. Equipment grounding conductor
C. Grounded conductor
D. Switched conductor
Answer: Grounded conductor
Rationale: The grounded conductor is generally identified by white or gray
insulation or markings. The identification rules help prevent confusion between
grounded, ungrounded, and grounding conductors.
4. What is the principal function of an equipment grounding conductor?
A. To carry normal circuit current
B. To increase circuit voltage
C. To provide a low-impedance path for fault current
D. To reduce the connected load
Answer: To provide a low-impedance path for fault current
,Rationale: The equipment grounding conductor provides an effective fault-
current path that permits overcurrent protective devices to operate promptly
when a fault occurs.
5. A 120/240-volt single-phase dwelling service has a calculated load of 150
amperes. What is the minimum service rating based solely on that
calculated load?
A. 100 amperes
B. 125 amperes
C. 150 amperes
D. 200 amperes
Answer: 150 amperes
Rationale: The service rating cannot be less than the calculated load. Other
requirements may cause a larger service to be selected, but the calculated load
establishes a minimum of 150 amperes in this example.
6. Which device is designed primarily to protect people from electric shock
caused by current flowing through an unintended path to ground?
A. AFCI
B. GFCI
C. Surge protective device
D. Disconnect switch
Answer: GFCI
Rationale: A ground-fault circuit-interrupter detects an imbalance between
current leaving and returning on the circuit conductors and opens the circuit
when the leakage reaches its trip threshold.
7. What is the purpose of an arc-fault circuit interrupter?
A. To regulate voltage
B. To protect against hazardous arcing conditions
, C. To increase available fault current
D. To replace all overcurrent protection
Answer: To protect against hazardous arcing conditions
Rationale: AFCIs are intended to detect dangerous arcing conditions and
interrupt the circuit before the arc can develop into a fire hazard.
8. A conductor supplying a continuous load must generally be sized so that
the ampacity is at least what percentage of the continuous load?
A. 80%
B. 100%
C. 110%
D. 125%
Answer: 125%
Rationale: Continuous loads are generally calculated at 125 percent for
conductor and overcurrent-protection sizing unless a specific provision permits
otherwise.
9. A circuit supplies a continuous load of 32 amperes. What minimum
ampacity is generally required for the conductors?
A. 32 amperes
B. 35 amperes
C. 40 amperes
D. 45 amperes
Answer: 40 amperes
Rationale: Thirty-two amperes multiplied by 125 percent equals 40 amperes.
The conductor ampacity must therefore generally be at least 40 amperes before
applicable adjustment and correction considerations.
10.Which condition is most likely to require conductor ampacity adjustment?
