Massachusetts Electrical Inspector Exam
Practice Test Questions and Correct Answers
(Verified Answers) Plus Rationales 2026 Q&A |
Instant Download Pdf
1. What is the primary purpose of the National Electrical Code
(NEC)?
A. To provide electrical design recommendations
B. To ensure safe electrical installations
C. To reduce construction costs
D. To regulate utility companies
Answer: B
Rationale: The NEC is designed to safeguard persons and
property from electrical hazards by establishing minimum safety
standards.
2. Which NEC article covers grounding and bonding requirements?
A. Article 110
B. Article 210
C. Article 250
, D. Article 300
Answer: C
Rationale: Article 250 specifically addresses grounding and
bonding to ensure safe fault current paths.
3. What is the minimum working space depth for equipment
operating at 0–150 volts to ground?
A. 24 inches
B. 30 inches
C. 36 inches
D. 42 inches
Answer: C
Rationale: NEC requires a minimum of 36 inches of working
clearance for such equipment.
4. What type of conductor is identified by green insulation?
A. Grounded conductor
B. Ungrounded conductor
C. Equipment grounding conductor
D. Neutral conductor
Answer: C
Rationale: Green or green with yellow stripes identifies
equipment grounding conductors.
,5. What is required for all electrical equipment installations?
A. Manufacturer branding
B. Labeling and listing
C. Utility approval
D. Insurance certification
Answer: B
Rationale: NEC requires equipment to be listed and labeled to
ensure safety compliance.
6. Which device protects against overcurrent?
A. Switch
B. Transformer
C. Circuit breaker
D. Capacitor
Answer: C
Rationale: Circuit breakers interrupt current flow when it exceeds
safe levels.
7. What does GFCI stand for?
A. Ground Fault Circuit Interrupter
B. General Fault Circuit Indicator
C. Ground Function Control Interface
D. General Fuse Circuit Installation
, Answer: A
Rationale: GFCIs protect against ground faults that can cause
shock hazards.
8. Where are GFCI protections required?
A. Bedrooms
B. Living rooms
C. Bathrooms
D. Attics
Answer: C
Rationale: Bathrooms require GFCI protection due to increased
shock risk from moisture.
9. What is the purpose of bonding?
A. Increase voltage
B. Ensure continuity of current
C. Reduce resistance
D. Equalize electrical potential
Answer: D
Rationale: Bonding prevents voltage differences between
conductive parts.
10. What is the maximum overcurrent protection for #14 AWG
copper conductors?
Practice Test Questions and Correct Answers
(Verified Answers) Plus Rationales 2026 Q&A |
Instant Download Pdf
1. What is the primary purpose of the National Electrical Code
(NEC)?
A. To provide electrical design recommendations
B. To ensure safe electrical installations
C. To reduce construction costs
D. To regulate utility companies
Answer: B
Rationale: The NEC is designed to safeguard persons and
property from electrical hazards by establishing minimum safety
standards.
2. Which NEC article covers grounding and bonding requirements?
A. Article 110
B. Article 210
C. Article 250
, D. Article 300
Answer: C
Rationale: Article 250 specifically addresses grounding and
bonding to ensure safe fault current paths.
3. What is the minimum working space depth for equipment
operating at 0–150 volts to ground?
A. 24 inches
B. 30 inches
C. 36 inches
D. 42 inches
Answer: C
Rationale: NEC requires a minimum of 36 inches of working
clearance for such equipment.
4. What type of conductor is identified by green insulation?
A. Grounded conductor
B. Ungrounded conductor
C. Equipment grounding conductor
D. Neutral conductor
Answer: C
Rationale: Green or green with yellow stripes identifies
equipment grounding conductors.
,5. What is required for all electrical equipment installations?
A. Manufacturer branding
B. Labeling and listing
C. Utility approval
D. Insurance certification
Answer: B
Rationale: NEC requires equipment to be listed and labeled to
ensure safety compliance.
6. Which device protects against overcurrent?
A. Switch
B. Transformer
C. Circuit breaker
D. Capacitor
Answer: C
Rationale: Circuit breakers interrupt current flow when it exceeds
safe levels.
7. What does GFCI stand for?
A. Ground Fault Circuit Interrupter
B. General Fault Circuit Indicator
C. Ground Function Control Interface
D. General Fuse Circuit Installation
, Answer: A
Rationale: GFCIs protect against ground faults that can cause
shock hazards.
8. Where are GFCI protections required?
A. Bedrooms
B. Living rooms
C. Bathrooms
D. Attics
Answer: C
Rationale: Bathrooms require GFCI protection due to increased
shock risk from moisture.
9. What is the purpose of bonding?
A. Increase voltage
B. Ensure continuity of current
C. Reduce resistance
D. Equalize electrical potential
Answer: D
Rationale: Bonding prevents voltage differences between
conductive parts.
10. What is the maximum overcurrent protection for #14 AWG
copper conductors?
