Wisconsin Master Electrician
Residential Exam Practice Questions
And Correct Answers (Verified Answers)
Plus Rationales 2026 Q&A | Instant
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1. According to electrical safety principles, the primary purpose of
overcurrent protection devices in a residential electrical system is to:
A. Increase circuit voltage
B. Prevent excessive current from damaging conductors and equipment
C. Improve power factor
D. Reduce the number of branch circuits required
Answer: B. Prevent excessive current from damaging conductors and
equipment
Overcurrent protection devices such as fuses and circuit breakers are
designed to interrupt excessive current caused by overloads or short
,circuits, protecting wiring and connected equipment from damage and fire
hazards.
2. In a residential electrical service, the grounded conductor is commonly
referred to as the:
A. Equipment grounding conductor
B. Phase conductor
C. Neutral conductor
D. Bonding jumper
Answer: C. Neutral conductor
The grounded conductor is the conductor intentionally connected to
ground at the service equipment and is commonly called the neutral
conductor in residential systems.
3. The National Electrical Code requires that service equipment be
installed in a location that is:
A. Difficult for occupants to access
B. Readily accessible
C. Located outdoors only
D. Installed inside bathrooms only
Answer: B. Readily accessible
,Service equipment must be readily accessible so authorized persons can
safely inspect, maintain, and operate disconnecting means.
4. A 120-volt residential branch circuit supplies a load of 1,800 watts.
What is the approximate current draw?
A. 5 amperes
B. 10 amperes
C. 15 amperes
D. 20 amperes
Answer: D. 15 amperes
Current is calculated using the formula I = P ÷ V. Dividing 1,800 watts by
120 volts gives 15 amperes.
5. The purpose of grounding an electrical system is primarily to:
A. Increase circuit voltage
B. Provide a safe path for fault current
C. Eliminate all electrical resistance
D. Reduce conductor size requirements
Answer: B. Provide a safe path for fault current
Grounding provides a low-impedance path for fault current, allowing
protective devices to operate quickly during electrical faults.
, 6. A residential circuit supplying general lighting loads is typically
protected by a:
A. 5-ampere breaker
B. 15- or 20-ampere breaker
C. 50-ampere breaker
D. 100-ampere breaker
Answer: B. 15- or 20-ampere breaker
General lighting branch circuits in residences are commonly supplied using
15- or 20-ampere overcurrent protection depending on conductor size and
installation requirements.
7. The minimum size equipment grounding conductor is determined
primarily by:
A. The number of outlets on the circuit
B. The rating of the overcurrent protection device
C. The building height
D. The length of the branch circuit
Answer: B. The rating of the overcurrent protection device
Equipment grounding conductor sizing is based on the rating of the
circuit’s overcurrent protective device according to NEC requirements.
Residential Exam Practice Questions
And Correct Answers (Verified Answers)
Plus Rationales 2026 Q&A | Instant
Download Pdf
1. According to electrical safety principles, the primary purpose of
overcurrent protection devices in a residential electrical system is to:
A. Increase circuit voltage
B. Prevent excessive current from damaging conductors and equipment
C. Improve power factor
D. Reduce the number of branch circuits required
Answer: B. Prevent excessive current from damaging conductors and
equipment
Overcurrent protection devices such as fuses and circuit breakers are
designed to interrupt excessive current caused by overloads or short
,circuits, protecting wiring and connected equipment from damage and fire
hazards.
2. In a residential electrical service, the grounded conductor is commonly
referred to as the:
A. Equipment grounding conductor
B. Phase conductor
C. Neutral conductor
D. Bonding jumper
Answer: C. Neutral conductor
The grounded conductor is the conductor intentionally connected to
ground at the service equipment and is commonly called the neutral
conductor in residential systems.
3. The National Electrical Code requires that service equipment be
installed in a location that is:
A. Difficult for occupants to access
B. Readily accessible
C. Located outdoors only
D. Installed inside bathrooms only
Answer: B. Readily accessible
,Service equipment must be readily accessible so authorized persons can
safely inspect, maintain, and operate disconnecting means.
4. A 120-volt residential branch circuit supplies a load of 1,800 watts.
What is the approximate current draw?
A. 5 amperes
B. 10 amperes
C. 15 amperes
D. 20 amperes
Answer: D. 15 amperes
Current is calculated using the formula I = P ÷ V. Dividing 1,800 watts by
120 volts gives 15 amperes.
5. The purpose of grounding an electrical system is primarily to:
A. Increase circuit voltage
B. Provide a safe path for fault current
C. Eliminate all electrical resistance
D. Reduce conductor size requirements
Answer: B. Provide a safe path for fault current
Grounding provides a low-impedance path for fault current, allowing
protective devices to operate quickly during electrical faults.
, 6. A residential circuit supplying general lighting loads is typically
protected by a:
A. 5-ampere breaker
B. 15- or 20-ampere breaker
C. 50-ampere breaker
D. 100-ampere breaker
Answer: B. 15- or 20-ampere breaker
General lighting branch circuits in residences are commonly supplied using
15- or 20-ampere overcurrent protection depending on conductor size and
installation requirements.
7. The minimum size equipment grounding conductor is determined
primarily by:
A. The number of outlets on the circuit
B. The rating of the overcurrent protection device
C. The building height
D. The length of the branch circuit
Answer: B. The rating of the overcurrent protection device
Equipment grounding conductor sizing is based on the rating of the
circuit’s overcurrent protective device according to NEC requirements.
