NASCLA ACCREDITED JOURNEYMAN ELECTRICIAN EXAM – QUESTIONS AND ANSWERS | VERIFIED AND WELL
DETAILED ANSWERS | PLUS RATIONALES | DOWNLOAD AND PASS | LATEST EXAM UPDATE 2026/2027
Core Domains
Electrical Theory and Application
National Electrical Code (NEC) Standards and Compliance
Load Calculations and Demand Factors
Wiring Methods and Materials
Grounding and Bonding
Overcurrent Protection and Device Coordination
Raceway and Box Sizing
Motor and Transformer Calculations
Hazardous Locations and Special Occupancies
Safety Protocols and OSHA Standards
,Introduction
This comprehensive examination is designed to assess the knowledge, skills, and professional judgment required for a
journeyman electrician. It rigorously evaluates a candidate’s understanding of foundational electrical theory, the
practical application of the National Electrical Code, and the ability to navigate complex, real-world scenarios
encountered in the field. The assessment employs multiple-choice questions, including scenario-based items, to test
decision-making, ethical conduct, compliance with safety regulations, and analytical problem-solving abilities. Success
on this exam demonstrates readiness to handle the responsibilities of the trade with competence, safety, and adherence
to industry standards.
SECTION ONE: QUESTIONS 1–50
1. In a resistive-capacitive (RC) series circuit, if the resistance is 30 ohms and the capacitive reactance is 40 ohms,
what is the total impedance of the circuit?
A. 70 ohms
B. 10 ohms
C. 50 ohms
D. 1,200 ohms
,🟢 Correct Answer: C. 50 ohms
🔴 Explanation: The total impedance (Z) is the phasor sum of resistance (R) and reactance (X). It is calculated as the
square root of (R² + X²), which is the square root of (30² + 40²) = 50 ohms.
2. A branch circuit supplies a continuous load of 16 amperes. According to the NEC, the minimum overcurrent
device rating for this circuit must be at least what value?
A. 16 amperes
B. 20 amperes
C. 25 amperes
D. 30 amperes
🟢 Correct Answer: B. 20 amperes
🔴 Explanation: NEC 210.20(A) requires the overcurrent device rating for continuous loads to be 125% of the
continuous load current. 16 A * 1.25 = 20 A, so a 20-ampere device is the minimum rating.
3. When sizing a grounding electrode conductor for a service, the conductor must be sized according to which of
the following?
A. The rating of the largest overcurrent device
B. The total load on the service
C. The size of the largest ungrounded service-entrance conductor
D. The cross-sectional area of the service neutral conductor
🟢 Correct Answer: A. The rating of the largest overcurrent device
, 🔴 Explanation: NEC Table 250.66 is used to size the grounding electrode conductor based on the area of the
largest ungrounded service-entrance conductor, but the reference point for the table is derived from the rating of
the service’s overcurrent protection device.
4. A 3-phase, 4-wire, 208Y/120-volt panelboard is supplied by a transformer. The maximum voltage to ground on
this system is:
A. 208 volts
B. 120 volts
C. 240 volts
D. 277 volts
🟢 Correct Answer: B. 120 volts
🔴 Explanation: In a 208Y/120-volt system, the voltage to ground is 120 volts. The 208 volts is the line-to-line
voltage.
5. How many 12 AWG conductors are permitted in a 4-inch square, 1½-inch deep metal box (21.5 cubic inches) if
no internal clamps or devices are present?
A. 9
B. 10
C. 11
D. 12
🟢 Correct Answer: C. 11
DETAILED ANSWERS | PLUS RATIONALES | DOWNLOAD AND PASS | LATEST EXAM UPDATE 2026/2027
Core Domains
Electrical Theory and Application
National Electrical Code (NEC) Standards and Compliance
Load Calculations and Demand Factors
Wiring Methods and Materials
Grounding and Bonding
Overcurrent Protection and Device Coordination
Raceway and Box Sizing
Motor and Transformer Calculations
Hazardous Locations and Special Occupancies
Safety Protocols and OSHA Standards
,Introduction
This comprehensive examination is designed to assess the knowledge, skills, and professional judgment required for a
journeyman electrician. It rigorously evaluates a candidate’s understanding of foundational electrical theory, the
practical application of the National Electrical Code, and the ability to navigate complex, real-world scenarios
encountered in the field. The assessment employs multiple-choice questions, including scenario-based items, to test
decision-making, ethical conduct, compliance with safety regulations, and analytical problem-solving abilities. Success
on this exam demonstrates readiness to handle the responsibilities of the trade with competence, safety, and adherence
to industry standards.
SECTION ONE: QUESTIONS 1–50
1. In a resistive-capacitive (RC) series circuit, if the resistance is 30 ohms and the capacitive reactance is 40 ohms,
what is the total impedance of the circuit?
A. 70 ohms
B. 10 ohms
C. 50 ohms
D. 1,200 ohms
,🟢 Correct Answer: C. 50 ohms
🔴 Explanation: The total impedance (Z) is the phasor sum of resistance (R) and reactance (X). It is calculated as the
square root of (R² + X²), which is the square root of (30² + 40²) = 50 ohms.
2. A branch circuit supplies a continuous load of 16 amperes. According to the NEC, the minimum overcurrent
device rating for this circuit must be at least what value?
A. 16 amperes
B. 20 amperes
C. 25 amperes
D. 30 amperes
🟢 Correct Answer: B. 20 amperes
🔴 Explanation: NEC 210.20(A) requires the overcurrent device rating for continuous loads to be 125% of the
continuous load current. 16 A * 1.25 = 20 A, so a 20-ampere device is the minimum rating.
3. When sizing a grounding electrode conductor for a service, the conductor must be sized according to which of
the following?
A. The rating of the largest overcurrent device
B. The total load on the service
C. The size of the largest ungrounded service-entrance conductor
D. The cross-sectional area of the service neutral conductor
🟢 Correct Answer: A. The rating of the largest overcurrent device
, 🔴 Explanation: NEC Table 250.66 is used to size the grounding electrode conductor based on the area of the
largest ungrounded service-entrance conductor, but the reference point for the table is derived from the rating of
the service’s overcurrent protection device.
4. A 3-phase, 4-wire, 208Y/120-volt panelboard is supplied by a transformer. The maximum voltage to ground on
this system is:
A. 208 volts
B. 120 volts
C. 240 volts
D. 277 volts
🟢 Correct Answer: B. 120 volts
🔴 Explanation: In a 208Y/120-volt system, the voltage to ground is 120 volts. The 208 volts is the line-to-line
voltage.
5. How many 12 AWG conductors are permitted in a 4-inch square, 1½-inch deep metal box (21.5 cubic inches) if
no internal clamps or devices are present?
A. 9
B. 10
C. 11
D. 12
🟢 Correct Answer: C. 11
