WYOMING MASTER ELECTRICIAN EXAM – QUESTIONS AND ANSWERS |
VERIFIED AND WELL DETAILED ANSWERS | PLUS RATIONALES | GUARANTEED
PASS | LATEST EXAM UPDATE
Core Domains
• National Electrical Code (NEC) Compliance
• Wiring Methods and Materials
• Overcurrent Protection and Grounding
• Load Calculations and Branch Circuits
• Motors, Transformers, and Equipment
• Wyoming Electrical Statutes and Licensing Rules
• Electrical Safety and NFPA 70E
• Professional Ethics and Enforcement
Introduction
The Wyoming Master Electrician Examination assesses the knowledge and
competence required to perform as a licensed master electrician in the State of
Wyoming. Candidates must demonstrate mastery of the National Electrical Code,
electrical theory, load calculations, wiring methods, and Wyoming-specific statutes
and administrative rules. The exam employs multiple-choice and scenario-based
questions that evaluate practical application, critical thinking, and professional
judgment. Emphasis is placed on real-world problem solving, regulatory compliance,
and ethical decision-making consistent with the standards of the electrical
profession.
SECTION ONE – QUESTIONS 1–50
Question 1
A master electrician is calculating the minimum ampacity for service-entrance
,conductors supplying a 120/240-volt, single-phase dwelling unit. The calculated
load is 185 amperes. The conductors will be installed in a raceway with an ambient
temperature of 30°C. Which conductor size is permitted?
A. 2/0 AWG copper THWN
B. 3/0 AWG copper THWN
C. 1/0 AWG copper THWN
D. 4/0 AWG copper THWN
🟢 Correct Answer: B. 3/0 AWG copper THWN
🔴 Rationale: Service-entrance conductors must have an ampacity not less than
the calculated load. At 75°C, 3/0 AWG copper has an ampacity of 200 amperes,
which exceeds 185 amperes. The 1/0 and 2/0 AWG conductors have ampacities of
150 A and 175 A respectively, which are insufficient. 4/0 AWG would be oversized
for this application.
Question 2
Under Wyoming Administrative Code Chapter 5, what is the minimum passing
grade for the master electrician examination?
A. 70 percent
B. 75 percent
C. 80 percent
D. 65 percent
🟢 Correct Answer: B. 75 percent
🔴 Rationale: Wyoming Administrative Code Section 5-3(e) explicitly states that
master electrician applicants shall receive a passing grade of 75 percent on the
examination .
Question 3
A 3-phase, 4-wire, 208Y/120-volt panelboard feeds a balanced load. The current in
each phase conductor is 42 amperes. What is the current in the neutral conductor?
A. 42 amperes
,B. 21 amperes
C. 0 amperes
D. 73 amperes
🟢 Correct Answer: C. 0 amperes
🔴 Rationale: In a balanced three-phase, four-wire system, the line-to-neutral
currents are equal in magnitude but displaced by 120 degrees. Their vector sum
cancels, resulting in zero neutral current.
Question 4
A master electrician discovers that a metal raceway containing branch circuits has
been used as the equipment grounding conductor. What is the primary concern
with this installation?
A. The raceway may overheat during normal operation
B. The raceway may not provide a low-impedance fault current path if improperly
installed
C. The raceway cannot carry voltage
D. The raceway must be painted to serve as an EGC
🟢 Correct Answer: B. The raceway may not provide a low-impedance fault current
path if improperly installed
🔴 Rationale: Metal raceways are permitted as equipment grounding conductors,
but they must provide a continuous, low-impedance path for fault current. Poor
connections, corrosion, or improper installation can compromise this path,
delaying overcurrent device operation.
Question 5
According to NFPA 70E, what is the arc flash boundary defined as?
A. The distance at which a worker must wear a hard hat
B. The distance at which incident energy equals 1.2 cal/cm²
C. The distance at which voltage can be safely measured
D. The distance at which only qualified persons may enter
, 🟢 Correct Answer: B. The distance at which incident energy equals 1.2 cal/cm²
🔴 Rationale: The arc flash boundary is the distance from exposed energized
conductors or circuit parts at which a person could receive a second-degree burn
if an arc flash occurred. This threshold is defined as 1.2 cal/cm² .
Question 6
A 480-volt, 3-phase motor has a nameplate full-load current of 52 amperes. What
is the minimum rating of the branch-circuit short-circuit and ground-fault
protective device using an inverse-time circuit breaker?
A. 60 amperes
B. 70 amperes
C. 80 amperes
D. 100 amperes
🟢 Correct Answer: C. 80 amperes
🔴 Rationale: For a 52-ampere motor, NEC Table 430.52 permits an inverse-time
breaker sized up to 250 percent of FLC. 52 × 2.50 = 130 amperes; however,
standard ratings are applied. A 70-ampere breaker would be insufficient for
starting. The 80-ampere standard rating is permitted and provides adequate
protection while accommodating motor inrush.
Question 7
Which of the following is required for renewal of a Wyoming master electrician
license?
A. Sixteen hours of continuing education, with at least eight hours covering the
NEC
B. Forty hours of continuing education annually
C. A passing score on a renewal examination
D. Proof of five years of active practice
🟢 Correct Answer: A. Sixteen hours of continuing education, with at least eight
hours covering the NEC
VERIFIED AND WELL DETAILED ANSWERS | PLUS RATIONALES | GUARANTEED
PASS | LATEST EXAM UPDATE
Core Domains
• National Electrical Code (NEC) Compliance
• Wiring Methods and Materials
• Overcurrent Protection and Grounding
• Load Calculations and Branch Circuits
• Motors, Transformers, and Equipment
• Wyoming Electrical Statutes and Licensing Rules
• Electrical Safety and NFPA 70E
• Professional Ethics and Enforcement
Introduction
The Wyoming Master Electrician Examination assesses the knowledge and
competence required to perform as a licensed master electrician in the State of
Wyoming. Candidates must demonstrate mastery of the National Electrical Code,
electrical theory, load calculations, wiring methods, and Wyoming-specific statutes
and administrative rules. The exam employs multiple-choice and scenario-based
questions that evaluate practical application, critical thinking, and professional
judgment. Emphasis is placed on real-world problem solving, regulatory compliance,
and ethical decision-making consistent with the standards of the electrical
profession.
SECTION ONE – QUESTIONS 1–50
Question 1
A master electrician is calculating the minimum ampacity for service-entrance
,conductors supplying a 120/240-volt, single-phase dwelling unit. The calculated
load is 185 amperes. The conductors will be installed in a raceway with an ambient
temperature of 30°C. Which conductor size is permitted?
A. 2/0 AWG copper THWN
B. 3/0 AWG copper THWN
C. 1/0 AWG copper THWN
D. 4/0 AWG copper THWN
🟢 Correct Answer: B. 3/0 AWG copper THWN
🔴 Rationale: Service-entrance conductors must have an ampacity not less than
the calculated load. At 75°C, 3/0 AWG copper has an ampacity of 200 amperes,
which exceeds 185 amperes. The 1/0 and 2/0 AWG conductors have ampacities of
150 A and 175 A respectively, which are insufficient. 4/0 AWG would be oversized
for this application.
Question 2
Under Wyoming Administrative Code Chapter 5, what is the minimum passing
grade for the master electrician examination?
A. 70 percent
B. 75 percent
C. 80 percent
D. 65 percent
🟢 Correct Answer: B. 75 percent
🔴 Rationale: Wyoming Administrative Code Section 5-3(e) explicitly states that
master electrician applicants shall receive a passing grade of 75 percent on the
examination .
Question 3
A 3-phase, 4-wire, 208Y/120-volt panelboard feeds a balanced load. The current in
each phase conductor is 42 amperes. What is the current in the neutral conductor?
A. 42 amperes
,B. 21 amperes
C. 0 amperes
D. 73 amperes
🟢 Correct Answer: C. 0 amperes
🔴 Rationale: In a balanced three-phase, four-wire system, the line-to-neutral
currents are equal in magnitude but displaced by 120 degrees. Their vector sum
cancels, resulting in zero neutral current.
Question 4
A master electrician discovers that a metal raceway containing branch circuits has
been used as the equipment grounding conductor. What is the primary concern
with this installation?
A. The raceway may overheat during normal operation
B. The raceway may not provide a low-impedance fault current path if improperly
installed
C. The raceway cannot carry voltage
D. The raceway must be painted to serve as an EGC
🟢 Correct Answer: B. The raceway may not provide a low-impedance fault current
path if improperly installed
🔴 Rationale: Metal raceways are permitted as equipment grounding conductors,
but they must provide a continuous, low-impedance path for fault current. Poor
connections, corrosion, or improper installation can compromise this path,
delaying overcurrent device operation.
Question 5
According to NFPA 70E, what is the arc flash boundary defined as?
A. The distance at which a worker must wear a hard hat
B. The distance at which incident energy equals 1.2 cal/cm²
C. The distance at which voltage can be safely measured
D. The distance at which only qualified persons may enter
, 🟢 Correct Answer: B. The distance at which incident energy equals 1.2 cal/cm²
🔴 Rationale: The arc flash boundary is the distance from exposed energized
conductors or circuit parts at which a person could receive a second-degree burn
if an arc flash occurred. This threshold is defined as 1.2 cal/cm² .
Question 6
A 480-volt, 3-phase motor has a nameplate full-load current of 52 amperes. What
is the minimum rating of the branch-circuit short-circuit and ground-fault
protective device using an inverse-time circuit breaker?
A. 60 amperes
B. 70 amperes
C. 80 amperes
D. 100 amperes
🟢 Correct Answer: C. 80 amperes
🔴 Rationale: For a 52-ampere motor, NEC Table 430.52 permits an inverse-time
breaker sized up to 250 percent of FLC. 52 × 2.50 = 130 amperes; however,
standard ratings are applied. A 70-ampere breaker would be insufficient for
starting. The 80-ampere standard rating is permitted and provides adequate
protection while accommodating motor inrush.
Question 7
Which of the following is required for renewal of a Wyoming master electrician
license?
A. Sixteen hours of continuing education, with at least eight hours covering the
NEC
B. Forty hours of continuing education annually
C. A passing score on a renewal examination
D. Proof of five years of active practice
🟢 Correct Answer: A. Sixteen hours of continuing education, with at least eight
hours covering the NEC
