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ICC E2 Commercial Electrical Inspector Exam Questions
with Correct Answers and explanations LATEST THIS
YEAR -JUST RELEASED
ICC E2 Commercial Electrical Inspector Exam
SUMMARIZED EXAM COVERAGE
The ICC E2 Commercial Electrical Inspector certification exam is based on the National Electrical Code
(NEC) . Candidates must answer 80 multiple-choice questions within 3.5 hours and achieve a minimum
passing score of 75% . The exam is open-book, allowing reference to the current NFPA 70 (NEC) . Key
domains include: general requirements (NEC Article 110); services (Article 230); branch circuits and
feeders (Articles 210, 215); wiring methods (Articles 300-392); grounding and bonding (Article 250);
overcurrent protection (Article 240); conductors and ampacity (Article 310); motors and HVAC (Articles
430, 440); special occupancies (Articles 500-517); emergency systems (Article 700); and low-voltage/fire
alarm systems (Articles 725, 760) .
1. A feeder is defined as a set of conductors that:
A) Connect the service to the main disconnect
B) Supply power to branch circuits from the service equipment
C) Only supply lighting loads
D) Must be grounded at every junction box
Answer: B
Rationale: Feeders deliver electricity from the service equipment or panelboard to branch circuits, not
directly to individual loads .
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2. What is the maximum recommended voltage drop for branch circuits to ensure proper equipment
performance?
A) 5%
B) 3%
C) 10%
D) 12%
Answer: B
Rationale: The NEC recommends a maximum of 3% voltage drop for branch circuits to ensure proper
equipment performance .
3. Which conductor color is designated for equipment grounding in a commercial electrical system?
A) Black
B) White
C) Green
D) Red
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Answer: C
Rationale: Green or bare copper conductors are designated for equipment grounding per NEC
standards .
4. A GFCI (Ground Fault Circuit Interrupter) is required in which of the following locations in a
commercial building?
A) Living rooms
B) Bathrooms
C) Storage closets
D) Mechanical rooms
Answer: B
Rationale: Bathrooms are considered wet areas; GFCI protection is required to prevent electrical shock
hazards .
5. According to NEC Table 210.21(B)(1), what is the maximum number of 20A, 120V receptacle outlets
permitted on a general-use branch circuit?
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A) 5
B) 8
C) 10
D) 12
Answer: B
Rationale: NEC Table 210.21(B)(1) limits general-use branch circuits to 8 receptacles to prevent
overload .
6. When performing conduit fill calculations, what must be included?
A) Only the largest conductor
B) All conductors, including grounding conductors
C) Only current-carrying conductors
D) Conductor insulation type only
Answer: B
ICC E2 Commercial Electrical Inspector Exam Questions
with Correct Answers and explanations LATEST THIS
YEAR -JUST RELEASED
ICC E2 Commercial Electrical Inspector Exam
SUMMARIZED EXAM COVERAGE
The ICC E2 Commercial Electrical Inspector certification exam is based on the National Electrical Code
(NEC) . Candidates must answer 80 multiple-choice questions within 3.5 hours and achieve a minimum
passing score of 75% . The exam is open-book, allowing reference to the current NFPA 70 (NEC) . Key
domains include: general requirements (NEC Article 110); services (Article 230); branch circuits and
feeders (Articles 210, 215); wiring methods (Articles 300-392); grounding and bonding (Article 250);
overcurrent protection (Article 240); conductors and ampacity (Article 310); motors and HVAC (Articles
430, 440); special occupancies (Articles 500-517); emergency systems (Article 700); and low-voltage/fire
alarm systems (Articles 725, 760) .
1. A feeder is defined as a set of conductors that:
A) Connect the service to the main disconnect
B) Supply power to branch circuits from the service equipment
C) Only supply lighting loads
D) Must be grounded at every junction box
Answer: B
Rationale: Feeders deliver electricity from the service equipment or panelboard to branch circuits, not
directly to individual loads .
, Page 2 of 102
2. What is the maximum recommended voltage drop for branch circuits to ensure proper equipment
performance?
A) 5%
B) 3%
C) 10%
D) 12%
Answer: B
Rationale: The NEC recommends a maximum of 3% voltage drop for branch circuits to ensure proper
equipment performance .
3. Which conductor color is designated for equipment grounding in a commercial electrical system?
A) Black
B) White
C) Green
D) Red
, Page 3 of 102
Answer: C
Rationale: Green or bare copper conductors are designated for equipment grounding per NEC
standards .
4. A GFCI (Ground Fault Circuit Interrupter) is required in which of the following locations in a
commercial building?
A) Living rooms
B) Bathrooms
C) Storage closets
D) Mechanical rooms
Answer: B
Rationale: Bathrooms are considered wet areas; GFCI protection is required to prevent electrical shock
hazards .
5. According to NEC Table 210.21(B)(1), what is the maximum number of 20A, 120V receptacle outlets
permitted on a general-use branch circuit?
, Page 4 of 102
A) 5
B) 8
C) 10
D) 12
Answer: B
Rationale: NEC Table 210.21(B)(1) limits general-use branch circuits to 8 receptacles to prevent
overload .
6. When performing conduit fill calculations, what must be included?
A) Only the largest conductor
B) All conductors, including grounding conductors
C) Only current-carrying conductors
D) Conductor insulation type only
Answer: B
