Journeyman Electrician Licensing Exam
Questions And Correct Answers (Verified
Answers) Plus Rationales 2026 Q&A |
Instant Download Pdf
1. What is the standard voltage for a typical residential single-phase
circuit in the United States?
120/240 volts
Most U.S. homes use 120/240V for standard appliances and
lighting.
2. Which conductor color is typically used for grounding in
residential wiring?
Green or bare copper
Green or bare copper wires are reserved for grounding to prevent
electrical shock hazards.
3. In a three-phase system, the phase sequence is important
because:
It determines the direction of rotation of motors
Motors depend on phase sequence for correct rotation; reversing
it can damage equipment.
4. What is the maximum allowable voltage drop for branch circuits?
3%
Limiting voltage drop ensures efficient operation of equipment and
prevents overheating.
,5. What type of conduit is generally required for wet locations?
Rigid metal conduit (RMC) or PVC
These conduits are water-resistant and protect conductors from
moisture.
6. The NEC requires that GFCI protection be provided for which of
the following locations?
Bathrooms, kitchens, and outdoor receptacles
GFCIs protect against ground faults where water is present.
7. Which tool is used to test continuity in a conductor?
Ohmmeter
An ohmmeter measures resistance; zero resistance indicates
continuity.
8. What is the primary function of a circuit breaker?
To interrupt current flow in case of overload or short circuit
Circuit breakers prevent overheating and fires by disconnecting
power under fault conditions.
9. How often should a residential service disconnect be rated in
amperes?
100–200 amps
Most modern homes require a 100–200A service to handle typical
loads.
10. Which device is used to step down voltage from 240V to
120V?
Transformer
Transformers adjust voltage levels for equipment compatibility.
, 11. In NEC, what is the minimum cover required for
underground PVC conduit in a residential area?
18 inches
This depth protects conductors from accidental contact and
damage.
12. Which wire gauge is typically used for a 20A residential
circuit?
12 AWG
12 AWG copper wire safely carries 20A without overheating.
13. What is the primary hazard of aluminum wiring if improperly
connected?
Fire due to oxidation and poor connections
Aluminum oxidizes and expands, increasing resistance and risk of
fire.
14. Which type of grounding electrode is commonly used for
residential grounding?
Grounding rod
Ground rods provide a low-resistance path to earth for fault
currents.
15. What is the NEC standard for the minimum height of
receptacles above the finished floor?
12 inches
This prevents moisture exposure and provides accessibility.
16. What does a three-way switch allow you to do?
Control a light from two different locations
Three-way switches use travelers to operate the same load from
multiple points.
Questions And Correct Answers (Verified
Answers) Plus Rationales 2026 Q&A |
Instant Download Pdf
1. What is the standard voltage for a typical residential single-phase
circuit in the United States?
120/240 volts
Most U.S. homes use 120/240V for standard appliances and
lighting.
2. Which conductor color is typically used for grounding in
residential wiring?
Green or bare copper
Green or bare copper wires are reserved for grounding to prevent
electrical shock hazards.
3. In a three-phase system, the phase sequence is important
because:
It determines the direction of rotation of motors
Motors depend on phase sequence for correct rotation; reversing
it can damage equipment.
4. What is the maximum allowable voltage drop for branch circuits?
3%
Limiting voltage drop ensures efficient operation of equipment and
prevents overheating.
,5. What type of conduit is generally required for wet locations?
Rigid metal conduit (RMC) or PVC
These conduits are water-resistant and protect conductors from
moisture.
6. The NEC requires that GFCI protection be provided for which of
the following locations?
Bathrooms, kitchens, and outdoor receptacles
GFCIs protect against ground faults where water is present.
7. Which tool is used to test continuity in a conductor?
Ohmmeter
An ohmmeter measures resistance; zero resistance indicates
continuity.
8. What is the primary function of a circuit breaker?
To interrupt current flow in case of overload or short circuit
Circuit breakers prevent overheating and fires by disconnecting
power under fault conditions.
9. How often should a residential service disconnect be rated in
amperes?
100–200 amps
Most modern homes require a 100–200A service to handle typical
loads.
10. Which device is used to step down voltage from 240V to
120V?
Transformer
Transformers adjust voltage levels for equipment compatibility.
, 11. In NEC, what is the minimum cover required for
underground PVC conduit in a residential area?
18 inches
This depth protects conductors from accidental contact and
damage.
12. Which wire gauge is typically used for a 20A residential
circuit?
12 AWG
12 AWG copper wire safely carries 20A without overheating.
13. What is the primary hazard of aluminum wiring if improperly
connected?
Fire due to oxidation and poor connections
Aluminum oxidizes and expands, increasing resistance and risk of
fire.
14. Which type of grounding electrode is commonly used for
residential grounding?
Grounding rod
Ground rods provide a low-resistance path to earth for fault
currents.
15. What is the NEC standard for the minimum height of
receptacles above the finished floor?
12 inches
This prevents moisture exposure and provides accessibility.
16. What does a three-way switch allow you to do?
Control a light from two different locations
Three-way switches use travelers to operate the same load from
multiple points.
