ICC E2 COMMERCIAL ELECTRICAL INSPECTOR EXAM PRACTICE TEST EXAM QUESTIONS AND
CORRECT ANSWERS (VERIFIED ANSWERS) PLUS RATIONALES 2026 Q&A | INSTANT
DOWNLOAD PDF.
*Core Domains*
*General Electrical Requirements and Definitions*
*Wiring Methods and Materials*
*Equipment for General Use*
*Special Occupancies and Hazardous Locations*
*Service, Feeders, and Branch Circuit Calculations*
*Grounding and Bonding Requirements*
*Overcurrent Protection and Conductor Ampacity*
*Life Safety and Emergency Systems*
*Plan Review and Inspection Procedures*
*Legal and Administrative Responsibilities*
*Introduction*
*The purpose of this examination is to evaluate the technical competency and professional proficiency
Section One: Questions 1–100
,What is the maximum permitted voltage for branch circuits supplying luminaires in dwelling units?
A. 120 volts
B. 240 volts
C. 277 volts
D. 480 volts
🟢 A. 120 volts
🔴 RATIONALE: According to the National Electrical Code, branch circuits supplying luminaires in
dwelling units are generally limited to a maximum of 120 volts between conductors.
A non-metallic-sheathed cable must be secured within how many inches of a box or cabinet?
A. 6 inches
B. 8 inches
C. 12 inches
D. 24 inches
🟢 C. 12 inches
🔴 RATIONALE: Non-metallic-sheathed cable must be secured at intervals not exceeding 4.5 feet
and within 12 inches of every box, cabinet, or fitting.
Which of the following is required for a service disconnecting means?
A. It must be a circuit breaker only
B. It must be lockable in the open position
C. It must be located outdoors
D. It must be rated for 200 amps minimum
🟢 B. It must be lockable in the open position
🔴 RATIONALE: The service disconnecting means must be capable of being locked in the open
position to ensure safety during maintenance or repairs.
,What is the minimum depth for a conduit containing service conductors installed under a building?
A. 6 inches
B. 12 inches
C. 18 inches
D. 24 inches
🟢 C. 18 inches
🔴 RATIONALE: Rigid metal conduit or intermediate metal conduit installed under a building
requires a minimum cover of 18 inches.
When calculating the total load of a commercial service, what is the demand factor for continuous
loads?
A. 80%
B. 100%
C. 125%
D. 150%
🟢 C. 125%
🔴 RATIONALE: Continuous loads must be calculated at 125% of the rating of the branch circuit or
the equipment to prevent overheating of overcurrent protective devices.
What color must a grounding conductor be?
A. White
B. Gray
C. Green
D. Blue
🟢 C. Green
🔴 RATIONALE: An equipment grounding conductor is required to be identified by a continuous
green color, green with one or more yellow stripes, or bare.
, Which of the following is permitted to be used as a grounding electrode?
A. Metal underground gas piping
B. Aluminum water piping
C. Metal frame of a building or structure
D. Underground metallic storage tanks
🟢 C. Metal frame of a building or structure
🔴 RATIONALE: The metal frame of a building or structure that is effectively grounded is
recognized as an acceptable grounding electrode.
In a hazardous location (Class I, Division 1), what type of conduit is required?
A. EMT
B. PVC
C. Rigid Metal Conduit (RMC)
D. Flexible Metal Conduit (FMC)
🟢 C. Rigid Metal Conduit (RMC)
🔴 RATIONALE: Rigid metal conduit with threaded connections is required in Class I, Division 1
locations to prevent the passage of flammable gases or vapors through the raceway system.
What is the minimum working space depth in front of electrical equipment operating at 480 volts?
A. 3 feet
B. 3.5 feet
C. 4 feet
D. 5 feet
🟢 B. 3.5 feet
🔴 RATIONALE: For equipment operating at 480 volts (Condition 2), the minimum required depth of
the working space is 3.5 feet.
CORRECT ANSWERS (VERIFIED ANSWERS) PLUS RATIONALES 2026 Q&A | INSTANT
DOWNLOAD PDF.
*Core Domains*
*General Electrical Requirements and Definitions*
*Wiring Methods and Materials*
*Equipment for General Use*
*Special Occupancies and Hazardous Locations*
*Service, Feeders, and Branch Circuit Calculations*
*Grounding and Bonding Requirements*
*Overcurrent Protection and Conductor Ampacity*
*Life Safety and Emergency Systems*
*Plan Review and Inspection Procedures*
*Legal and Administrative Responsibilities*
*Introduction*
*The purpose of this examination is to evaluate the technical competency and professional proficiency
Section One: Questions 1–100
,What is the maximum permitted voltage for branch circuits supplying luminaires in dwelling units?
A. 120 volts
B. 240 volts
C. 277 volts
D. 480 volts
🟢 A. 120 volts
🔴 RATIONALE: According to the National Electrical Code, branch circuits supplying luminaires in
dwelling units are generally limited to a maximum of 120 volts between conductors.
A non-metallic-sheathed cable must be secured within how many inches of a box or cabinet?
A. 6 inches
B. 8 inches
C. 12 inches
D. 24 inches
🟢 C. 12 inches
🔴 RATIONALE: Non-metallic-sheathed cable must be secured at intervals not exceeding 4.5 feet
and within 12 inches of every box, cabinet, or fitting.
Which of the following is required for a service disconnecting means?
A. It must be a circuit breaker only
B. It must be lockable in the open position
C. It must be located outdoors
D. It must be rated for 200 amps minimum
🟢 B. It must be lockable in the open position
🔴 RATIONALE: The service disconnecting means must be capable of being locked in the open
position to ensure safety during maintenance or repairs.
,What is the minimum depth for a conduit containing service conductors installed under a building?
A. 6 inches
B. 12 inches
C. 18 inches
D. 24 inches
🟢 C. 18 inches
🔴 RATIONALE: Rigid metal conduit or intermediate metal conduit installed under a building
requires a minimum cover of 18 inches.
When calculating the total load of a commercial service, what is the demand factor for continuous
loads?
A. 80%
B. 100%
C. 125%
D. 150%
🟢 C. 125%
🔴 RATIONALE: Continuous loads must be calculated at 125% of the rating of the branch circuit or
the equipment to prevent overheating of overcurrent protective devices.
What color must a grounding conductor be?
A. White
B. Gray
C. Green
D. Blue
🟢 C. Green
🔴 RATIONALE: An equipment grounding conductor is required to be identified by a continuous
green color, green with one or more yellow stripes, or bare.
, Which of the following is permitted to be used as a grounding electrode?
A. Metal underground gas piping
B. Aluminum water piping
C. Metal frame of a building or structure
D. Underground metallic storage tanks
🟢 C. Metal frame of a building or structure
🔴 RATIONALE: The metal frame of a building or structure that is effectively grounded is
recognized as an acceptable grounding electrode.
In a hazardous location (Class I, Division 1), what type of conduit is required?
A. EMT
B. PVC
C. Rigid Metal Conduit (RMC)
D. Flexible Metal Conduit (FMC)
🟢 C. Rigid Metal Conduit (RMC)
🔴 RATIONALE: Rigid metal conduit with threaded connections is required in Class I, Division 1
locations to prevent the passage of flammable gases or vapors through the raceway system.
What is the minimum working space depth in front of electrical equipment operating at 480 volts?
A. 3 feet
B. 3.5 feet
C. 4 feet
D. 5 feet
🟢 B. 3.5 feet
🔴 RATIONALE: For equipment operating at 480 volts (Condition 2), the minimum required depth of
the working space is 3.5 feet.
