ICC E2 Commercial Electrical Inspector Exam
Complete Study Guide (150+ Questions)
Multiple Choice with Answers & Rationales
EXAM OVERVIEW
The ICC E2 Commercial Electrical Inspector
certification validates knowledge of commercial and
industrial electrical systems under the National
Electrical Code (NEC) . This certification is for
professionals inspecting electrical systems in all types
of buildings and structures with no limit as to voltage
or amperage .
Feature Details
Primary Reference 2023 NFPA 70 (National Electrical Code
Number of Questions 80 multiple-choice
Time Allowed 3.5 hours (210 minutes)
Format Open Book
,Feature Details
Passing Score 75% (60 correct answers)
Content Areas :
• Project Administration & Public Information (5%)
• Conductors (5%)
• Services (17%)
• Branch Circuit and Feeder Requirements (19%)
• Wiring Methods and Distribution Systems (19%)
• General Use Equipment (12%)
• Special Occupancies (9%)
• Special Equipment (7%)
• Special Systems (7%)
SECTION 1: GENERAL REQUIREMENTS & CODE
ADMINISTRATION (Questions 1-15)
1. A feeder is 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 panel to branch circuits, not directly to
individual loads. Branch circuits supply the final loads .
2. The maximum allowable voltage drop for branch
circuits to maintain efficiency is:
A) 5%
B) 3%
C) 10%
D) 12%
Answer: B
Rationale: The National Electrical Code (NEC)
recommends a maximum of 3% voltage drop for
branch circuits and 5% total (feeder + branch circuit) to
, ensure proper equipment performance. This is an
informational note, not a mandatory requirement .
3. Which conductor color is typically used for
equipment grounding in a commercial system?
A) Black
B) White
C) Green or bare copper
D) Red
Answer: C
Rationale: Green or bare copper conductors are
designated for equipment grounding per NEC 250.119.
White or gray is for grounded (neutral) conductors .
4. Which device protects a branch circuit from
overload?
A) GFCI
B) Circuit breaker or fuse
Complete Study Guide (150+ Questions)
Multiple Choice with Answers & Rationales
EXAM OVERVIEW
The ICC E2 Commercial Electrical Inspector
certification validates knowledge of commercial and
industrial electrical systems under the National
Electrical Code (NEC) . This certification is for
professionals inspecting electrical systems in all types
of buildings and structures with no limit as to voltage
or amperage .
Feature Details
Primary Reference 2023 NFPA 70 (National Electrical Code
Number of Questions 80 multiple-choice
Time Allowed 3.5 hours (210 minutes)
Format Open Book
,Feature Details
Passing Score 75% (60 correct answers)
Content Areas :
• Project Administration & Public Information (5%)
• Conductors (5%)
• Services (17%)
• Branch Circuit and Feeder Requirements (19%)
• Wiring Methods and Distribution Systems (19%)
• General Use Equipment (12%)
• Special Occupancies (9%)
• Special Equipment (7%)
• Special Systems (7%)
SECTION 1: GENERAL REQUIREMENTS & CODE
ADMINISTRATION (Questions 1-15)
1. A feeder is 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 panel to branch circuits, not directly to
individual loads. Branch circuits supply the final loads .
2. The maximum allowable voltage drop for branch
circuits to maintain efficiency is:
A) 5%
B) 3%
C) 10%
D) 12%
Answer: B
Rationale: The National Electrical Code (NEC)
recommends a maximum of 3% voltage drop for
branch circuits and 5% total (feeder + branch circuit) to
, ensure proper equipment performance. This is an
informational note, not a mandatory requirement .
3. Which conductor color is typically used for
equipment grounding in a commercial system?
A) Black
B) White
C) Green or bare copper
D) Red
Answer: C
Rationale: Green or bare copper conductors are
designated for equipment grounding per NEC 250.119.
White or gray is for grounded (neutral) conductors .
4. Which device protects a branch circuit from
overload?
A) GFCI
B) Circuit breaker or fuse
