Pennsylvania Uniform Construction Code
(UCC) – Master Electrician Examination (ICC
National Standard Exam Questions and
Correct Answers (Verified Answers) Plus
Rationale 2027 Q&A| Instant Download Pdf
1. What is the primary purpose of the National Electrical Code
(NEC)?
A. To establish electrical utility rates
B. To provide practical safeguards for persons and property from
electrical hazards
C. To regulate electrical contractor advertising
D. To determine electrician wages
Answer: B. To provide practical safeguards for persons and property
from electrical hazards
Rationale: The NEC is intended to provide practical safeguards for
people and property from hazards arising from the use of electricity. It
,establishes minimum requirements for electrical installations rather
than regulating rates, wages, or business advertising.
2. In a typical dwelling-unit branch circuit, which conductor is
generally identified as the grounded (neutral) conductor?
A. Green
B. Orange
C. White or gray
D. Bare copper only
Answer: C. White or gray
Rationale: The grounded conductor is generally identified by white or
gray insulation. Green or bare conductors are normally reserved for
equipment grounding purposes.
3. What is the primary function of an equipment grounding
conductor?
A. To carry normal circuit current
B. To provide a low-impedance path for fault current
C. To increase circuit voltage
D. To replace the grounded conductor
Answer: B. To provide a low-impedance path for fault current
,Rationale: The equipment grounding conductor provides a conductive
path intended to carry fault current back to the source so that the
overcurrent protective device can operate promptly.
4. A circuit is protected by a 20-ampere overcurrent device. What is
the general minimum copper conductor size permitted for a
typical 20-ampere branch circuit?
A. 14 AWG
B. 12 AWG
C. 10 AWG
D. 8 AWG
Answer: B. 12 AWG
Rationale: For typical circuits under the NEC ampacity rules, 12 AWG
copper is commonly used for 20-ampere branch circuits. Certain
conditions and adjustment or correction requirements can change
conductor requirements.
5. Which device is designed primarily to protect people from electric
shock caused by ground-fault current?
A. AFCI
B. GFCI
, C. Surge arrester
D. Transformer
Answer: B. GFCI
Rationale: A ground-fault circuit-interrupter monitors current balance
and disconnects the circuit when it detects a ground-fault current at
the required trip level. AFCI protection addresses hazardous arcing
conditions.
6. Which type of protection is specifically intended to detect
potentially hazardous arcing faults?
A. GFCI
B. AFCI
C. Thermal overload relay only
D. Grounding electrode
Answer: B. AFCI
Rationale: Arc-fault circuit-interrupters are designed to detect
characteristics of dangerous arcing and interrupt the circuit before an
arc develops into a fire hazard.
7. What is the purpose of a circuit breaker in an electrical
distribution system?
(UCC) – Master Electrician Examination (ICC
National Standard Exam Questions and
Correct Answers (Verified Answers) Plus
Rationale 2027 Q&A| Instant Download Pdf
1. What is the primary purpose of the National Electrical Code
(NEC)?
A. To establish electrical utility rates
B. To provide practical safeguards for persons and property from
electrical hazards
C. To regulate electrical contractor advertising
D. To determine electrician wages
Answer: B. To provide practical safeguards for persons and property
from electrical hazards
Rationale: The NEC is intended to provide practical safeguards for
people and property from hazards arising from the use of electricity. It
,establishes minimum requirements for electrical installations rather
than regulating rates, wages, or business advertising.
2. In a typical dwelling-unit branch circuit, which conductor is
generally identified as the grounded (neutral) conductor?
A. Green
B. Orange
C. White or gray
D. Bare copper only
Answer: C. White or gray
Rationale: The grounded conductor is generally identified by white or
gray insulation. Green or bare conductors are normally reserved for
equipment grounding purposes.
3. What is the primary function of an equipment grounding
conductor?
A. To carry normal circuit current
B. To provide a low-impedance path for fault current
C. To increase circuit voltage
D. To replace the grounded conductor
Answer: B. To provide a low-impedance path for fault current
,Rationale: The equipment grounding conductor provides a conductive
path intended to carry fault current back to the source so that the
overcurrent protective device can operate promptly.
4. A circuit is protected by a 20-ampere overcurrent device. What is
the general minimum copper conductor size permitted for a
typical 20-ampere branch circuit?
A. 14 AWG
B. 12 AWG
C. 10 AWG
D. 8 AWG
Answer: B. 12 AWG
Rationale: For typical circuits under the NEC ampacity rules, 12 AWG
copper is commonly used for 20-ampere branch circuits. Certain
conditions and adjustment or correction requirements can change
conductor requirements.
5. Which device is designed primarily to protect people from electric
shock caused by ground-fault current?
A. AFCI
B. GFCI
, C. Surge arrester
D. Transformer
Answer: B. GFCI
Rationale: A ground-fault circuit-interrupter monitors current balance
and disconnects the circuit when it detects a ground-fault current at
the required trip level. AFCI protection addresses hazardous arcing
conditions.
6. Which type of protection is specifically intended to detect
potentially hazardous arcing faults?
A. GFCI
B. AFCI
C. Thermal overload relay only
D. Grounding electrode
Answer: B. AFCI
Rationale: Arc-fault circuit-interrupters are designed to detect
characteristics of dangerous arcing and interrupt the circuit before an
arc develops into a fire hazard.
7. What is the purpose of a circuit breaker in an electrical
distribution system?
