ICC COMMERCIAL ELECTRICAL INSPECTOR
EXAM (E2) QUESTIONS AND ANSWERS
MASTER STUDY PACK 2026
This premium study pack features all verified multiple-choice
practice questions with detailed code rationales tailored for the
ICC E2 exam. Designed to mimic the actual testing environment,
the material covers critical commercial electrical inspection topics
including grounding, bonding, hazardous locations, and
workspace clearances under the latest National Electrical Code
guidelines. It serves as an indispensable tool for electrical
contractors, inspectors, and engineers looking to secure their
official commercial certification on the first attempt.
1. What is the minimum depth of working space
required in front of an electrical panel operating
at 120/208V where live parts are exposed on one
side and grounded parts on the other (Condition
2)?
A) 30 inches
B) 36 inches
C) 42 inches
D) 48 inches
Rationale: NEC 110.26(A)(1) Table specifies that
for voltages to ground up to 150V, the minimum
clear working space depth for Condition 2 is 36
inches (3 feet) to ensure personnel safety during
live maintenance.
,2. When installing a commercial service
consisting of parallel sets of conductors in
multiple raceways, how must the equipment
grounding conductors be run?
A) Run in parallel within each raceway, sized fully
according to the overcurrent device.
B) Run as a single oversized conductor outside the
raceways.
C) Run only in one primary master raceway.
D) Sized fractionally based on the number of total
parallel conduits.
Rationale: NEC 250.122(F) dictates that where
conductors are run in parallel in multiple
raceways, the equipment grounding conductor
must be run in parallel within each raceway and
must be full-sized based on the rating of the
overcurrent protective device.
3. What is the maximum distance from a kitchen
sink that a 125-volt, single-phase, 15- or 20-amp
commercial receptacle can be installed without
requiring GFCI protection?
A) 3 feet
B) 4 feet
C) 6 feet
D) 8 feet
,Rationale: NEC 210.8(B)(5) explicitly states that
all 125-volt, single-phase, 15- and 20-amp
receptacles installed within 6 feet (1.8 meters) of
the top inside edge of the bowl of the sink in
non-dwelling locations must have GFCI
protection.
4. Which of the following defines the term
"Continuous Load" as applied to commercial
electrical systems?
A) A load where the maximum current is expected to
continue for 1 hour or more.
B) A load where the maximum current is expected to
continue for 2 hours or more.
C) A load where the maximum current is expected to
continue for 3 hours or more.
D) A load that operates 24 hours a day without
cycling off.
Rationale: NEC Article 100 defines a continuous
load as a load where the maximum current is
expected to continue for 3 hours or more.
Branch circuits and service conductors must be
sized at 125% of this continuous value.
5. What is the minimum size of a copper
grounding electrode conductor required for a
, commercial service supplied by 3/0 AWG copper
ungrounded service-entry conductors?
A) 6 AWG
B) 4 AWG
C) 2 AWG
D) 1/0 AWG
Rationale: NEC Table 250.66 states that for
ungrounded service-entry copper conductors
sized 2/0 AWG or 3/0 AWG, the minimum
required size for a copper grounding electrode
conductor is 4 AWG.
6. A 480V, 3-phase commercial service
transformer must have an individual overcurrent
protection device on the primary side rated at
what maximum percentage of its rated primary
current, assuming no secondary protection?
A) 100%
B) 125%
C) 250%
D) 300%
Rationale: NEC Table 450.3(A) and (B) state that
transformers operating over or under 1000V with
primary-only protection must have an
overcurrent device rated at a maximum of 125%
of the primary current, or the next higher
EXAM (E2) QUESTIONS AND ANSWERS
MASTER STUDY PACK 2026
This premium study pack features all verified multiple-choice
practice questions with detailed code rationales tailored for the
ICC E2 exam. Designed to mimic the actual testing environment,
the material covers critical commercial electrical inspection topics
including grounding, bonding, hazardous locations, and
workspace clearances under the latest National Electrical Code
guidelines. It serves as an indispensable tool for electrical
contractors, inspectors, and engineers looking to secure their
official commercial certification on the first attempt.
1. What is the minimum depth of working space
required in front of an electrical panel operating
at 120/208V where live parts are exposed on one
side and grounded parts on the other (Condition
2)?
A) 30 inches
B) 36 inches
C) 42 inches
D) 48 inches
Rationale: NEC 110.26(A)(1) Table specifies that
for voltages to ground up to 150V, the minimum
clear working space depth for Condition 2 is 36
inches (3 feet) to ensure personnel safety during
live maintenance.
,2. When installing a commercial service
consisting of parallel sets of conductors in
multiple raceways, how must the equipment
grounding conductors be run?
A) Run in parallel within each raceway, sized fully
according to the overcurrent device.
B) Run as a single oversized conductor outside the
raceways.
C) Run only in one primary master raceway.
D) Sized fractionally based on the number of total
parallel conduits.
Rationale: NEC 250.122(F) dictates that where
conductors are run in parallel in multiple
raceways, the equipment grounding conductor
must be run in parallel within each raceway and
must be full-sized based on the rating of the
overcurrent protective device.
3. What is the maximum distance from a kitchen
sink that a 125-volt, single-phase, 15- or 20-amp
commercial receptacle can be installed without
requiring GFCI protection?
A) 3 feet
B) 4 feet
C) 6 feet
D) 8 feet
,Rationale: NEC 210.8(B)(5) explicitly states that
all 125-volt, single-phase, 15- and 20-amp
receptacles installed within 6 feet (1.8 meters) of
the top inside edge of the bowl of the sink in
non-dwelling locations must have GFCI
protection.
4. Which of the following defines the term
"Continuous Load" as applied to commercial
electrical systems?
A) A load where the maximum current is expected to
continue for 1 hour or more.
B) A load where the maximum current is expected to
continue for 2 hours or more.
C) A load where the maximum current is expected to
continue for 3 hours or more.
D) A load that operates 24 hours a day without
cycling off.
Rationale: NEC Article 100 defines a continuous
load as a load where the maximum current is
expected to continue for 3 hours or more.
Branch circuits and service conductors must be
sized at 125% of this continuous value.
5. What is the minimum size of a copper
grounding electrode conductor required for a
, commercial service supplied by 3/0 AWG copper
ungrounded service-entry conductors?
A) 6 AWG
B) 4 AWG
C) 2 AWG
D) 1/0 AWG
Rationale: NEC Table 250.66 states that for
ungrounded service-entry copper conductors
sized 2/0 AWG or 3/0 AWG, the minimum
required size for a copper grounding electrode
conductor is 4 AWG.
6. A 480V, 3-phase commercial service
transformer must have an individual overcurrent
protection device on the primary side rated at
what maximum percentage of its rated primary
current, assuming no secondary protection?
A) 100%
B) 125%
C) 250%
D) 300%
Rationale: NEC Table 450.3(A) and (B) state that
transformers operating over or under 1000V with
primary-only protection must have an
overcurrent device rated at a maximum of 125%
of the primary current, or the next higher
