110+ Free ICC E2 Practice Questions

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Key Facts: ICC E2 Exam

80 Qs

Exam Questions

Open-book

3.5 hrs

Time Limit

210 minutes

Passing Score

Scaled score

$220-$320

Exam Fee

ICC member discount

Select cycle

Reference Code

ICC Exam Catalog

The ICC E2 exam has 80 multiple-choice questions, a 3.5-hour limit, and an open-book format. The passing standard is a scaled 75; ICC does not publish a fixed raw-score conversion or candidate pass rate. Confirm the selected code cycle and approved references in the current catalog before studying or purchasing.

Sample ICC E2 Practice Questions

Try these sample questions to test your ICC E2 exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 110+ question experience with AI tutoring.

1Per NEC 110.26(A)(1), what is the minimum depth of working space in front of electrical equipment operating at 300 volts where exposed live parts are on one side and grounded parts (such as concrete walls) are on the other side (Condition 2)?

A.3 feet

B.3.5 feet

C.4 feet

D.4.5 feet

Explanation: NEC Table 110.26(A)(1) requires 3.5 feet of working space for Condition 2 at 151-600 volts nominal to ground. Condition 1 (no exposed live parts on the opposite side) requires 3 feet, and Condition 3 (live parts on both sides) requires 4 feet. These clearances ensure safe access for installation and maintenance. Exam tip: memorize the 3/3.5/4 foot Condition 1/2/3 pattern for 151-600 V — it is one of the most frequently tested general-requirement items on the E2.

2According to NEC Article 100, the term 'continuous load' is defined as a load where the maximum current is expected to continue for at least how long?

A.1 hour

B.2 hours

C.3 hours

D.4 hours

Explanation: NEC Article 100 defines a continuous load as a load where the maximum current is expected to continue for 3 hours or more. This definition triggers the 125% sizing rule in 210.19, 210.20, 215.2, and 215.3 for branch circuits and feeders supplying continuous loads. Commercial lighting and store display loads are typically continuous. Exam tip: whenever a question mentions a load operating 3+ hours, immediately think 125% conductor and OCPD sizing.

3Per NEC 110.26(E), what is the minimum required headroom of working space about service equipment, switchboards, panelboards, and motor control centers in commercial occupancies?

A.6 feet

B.6 feet 6 inches

C.6 feet 6 inches or height of equipment, whichever is greater

D.7 feet

Explanation: NEC 110.26(E) requires the minimum headroom of working spaces about service equipment, switchboards, panelboards, and motor control centers to be 6 feet 6 inches (78 inches) or the height of the equipment, whichever is greater. This ensures that workers can safely stand in front of equipment during maintenance. Exam tip: the 6'6" (78-inch) value applies to commercial spaces — residential 1φ panelboards of 200 A or less are exempt from the headroom rule.

4NEC 110.26(C)(2) requires how many entrances to and egress from the working space for large equipment rated 1200 amperes or more and over 6 feet wide?

A.1 entrance

B.At least 1 entrance not less than 24 in. wide and 6.5 ft high

C.Two entrances, one at each end of the working space

D.Three entrances equally spaced

Explanation: NEC 110.26(C)(2) requires at least one entrance not less than 24 in. wide and 6.5 ft high at each end of the working space for equipment rated 1200 A or more and over 6 ft wide. This ensures workers can quickly escape if an arc flash occurs. Exceptions allow a single entrance if a continuous and unobstructed way of egress is provided or if the working space is doubled. Exam tip: 1200 A and 6 ft wide is the dual trigger — miss either threshold and the two-entrance rule does not apply.

5Per NEC 110.14(C)(1), conductors with a temperature rating higher than the termination rating (for example 90°C conductors terminating on 75°C-rated equipment) must have their ampacity determined based on which temperature column of Table 310.16?

A.60°C column

B.75°C column

C.90°C column

D.The highest rating of any component

Explanation: NEC 110.14(C)(1) requires the conductor ampacity to be selected based on the lowest temperature rating of any connected termination, conductor, or device. A 90°C THHN conductor terminating on 75°C-rated lugs must use the 75°C column of Table 310.16, not the 90°C column. The higher 90°C rating is only used for ampacity adjustment and correction factors. Exam tip: use the 90°C column only as the starting point for derating — the final ampacity must still come from the termination temperature column.

6Per NEC 110.22(A), each disconnecting means must be legibly marked to indicate its purpose unless located and arranged so the purpose is evident. What additional marking requirement applies in 110.22?

A.The marking must be engraved only

B.The marking must be of sufficient durability to withstand the environment involved

C.The marking must be at least 1 inch tall

D.No durability requirement exists

Explanation: NEC 110.22(A) requires each disconnecting means to be legibly marked to indicate its purpose, and the marking must be of sufficient durability to withstand the environment involved. Simple handwritten labels on masking tape fail this requirement in damp or outdoor locations. Exam tip: engraved phenolic or laminated tags are common compliant methods — inspectors frequently cite fading Sharpie labels in mechanical rooms.

7Per NEC 110.26(A)(3), the minimum width of working space in front of electrical equipment shall be the width of the equipment or how many inches, whichever is greater?

A.24 inches

B.30 inches

C.36 inches

D.42 inches

Explanation: NEC 110.26(A)(3) requires the width of the working space in front of the electrical equipment to be the width of the equipment or 30 inches, whichever is greater. The space must permit at least a 90-degree opening of equipment doors or hinged panels. This 30-inch rule is independent of the depth requirements in 110.26(A)(1). Exam tip: the 30-inch width can be measured from either the left or right edge of the equipment — it does not have to be centered on the enclosure.

8NEC 110.24(A) requires service equipment in other than dwelling units to be legibly field-marked with the maximum available fault current, the date the calculation was performed, and to meet which additional requirement?

A.The marking must be updated every 5 years regardless of changes

B.The calculation must be updated when modifications affect the maximum available fault current

C.The marking must be approved by a licensed engineer

D.Only the service transformer rating is required

Explanation: NEC 110.24(B) requires the field-marked available fault current calculation to be updated whenever modifications to the electrical installation affect the maximum available fault current. The marking must be sufficient durability to withstand the environment involved. This ensures the service equipment's short-circuit current rating (SCCR) is not exceeded. Exam tip: inspectors verify the label exists, shows a date, and has been updated after any significant service change — missing the date is a common cited violation.

9Per NEC 210.19(A)(1), branch circuit conductors must have an ampacity of not less than the maximum load to be served, and for continuous loads plus noncontinuous loads, the minimum branch circuit conductor size (before derating) must be at least what percentage of the continuous load plus 100% of the noncontinuous load?

A.100% continuous + 100% noncontinuous

B.115% continuous + 100% noncontinuous

C.125% continuous + 100% noncontinuous

D.150% continuous + 100% noncontinuous

Explanation: NEC 210.19(A)(1) requires branch circuit conductors to have an ampacity before any derating of at least 125% of the continuous load plus 100% of the noncontinuous load. The same 125% factor applies to the OCPD sizing in 210.20(A) unless both the OCPD and its assembly are listed for operation at 100% of their rating. Exam tip: the 125% factor is one of the most tested rules on the E2 — expect several calculation questions applying it.

10A commercial lighting branch circuit has a continuous load of 16 amperes and no noncontinuous load. What is the minimum branch circuit OCPD rating per NEC 210.20(A)?

A.15 amperes

B.16 amperes

C.20 amperes

D.25 amperes

Explanation: NEC 210.20(A) requires the branch circuit OCPD rating to be at least 125% of continuous loads plus 100% of noncontinuous loads. 16 A × 1.25 = 20 A, so the next standard size per 240.6(A) is 20 amperes. A 15-ampere breaker would be undersized, and there is no need to go to 25 amperes. Exam tip: always round up to the next standard size in 240.6(A) — 15, 20, 25, 30, 35, 40, 45, 50, 60, 70, 80, 90, 100, 110, 125, 150, etc.

About the ICC E2 Exam

The ICC Commercial Electrical Inspector (E2) exam certifies commercial electrical inspection knowledge across general requirements, services, branch circuits and feeders, wiring methods, general-use equipment, special occupancies, special equipment, and special systems. ICC sells E2 by code cycle, so candidates must verify the cycle and approved references selected at purchase.

Questions

80 scored questions

Time Limit

3.5 hours (210 minutes)

Passing Score

75 (scaled score)

Exam Fee

$220-$320 (ICC (Pearson VUE / PRONTO))

ICC E2 Exam Content Outline

10%

General Requirements

Administration, public information, conductors, splices, and terminations

17%

Services

Service size, ratings, installation, grounding, and bonding

19%

Branch Circuit and Feeder Requirements

Installation, calculations, ratings, overcurrent protection, equipment grounding, and bonding

19%

Wiring Methods and Distribution Systems

Outlets, boxes, panelboards, raceways, cables, bus ducts, flexible cords, and fixture wires

12%

General Use Equipment

Switches, receptacles, luminaires, appliances, HVAC, motors, controllers, transformers, and generators

Special Occupancies

Hazardous locations, health care, commercial garages and fuel areas, and other special occupancies

Special Equipment

Pools, fountains, signs, data equipment, and miscellaneous special equipment

Special Systems

Emergency, standby, signaling, fire alarm, and communications systems

How to Pass the ICC E2 Exam

What You Need to Know

Passing score: 75 (scaled score)
Exam length: 80 questions
Time limit: 3.5 hours (210 minutes)
Exam fee: $220-$320

Keys to Passing

Work through all 110 available questions
Review every answer and explanation
Track weak areas and revisit them
Use our AI tutor for tough concepts

ICC E2 Study Tips from Top Performers

1Verify the selected E2 code cycle and approved references before tabbing or annotating a book; follow the current delivery method's reference rules

2Memorize the 3/6/9 foot working space depths in NEC 110.26(A)(1) for Conditions 1/2/3 and the 6.5 ft (78 in) minimum headroom — these general-requirement questions are free points

3Master the 125% continuous load rule in NEC 210.20(A) and 215.3 for branch circuit and feeder OCPD sizing — this is the most tested calculation pattern on the E2 exam

4Know Article 250 cold: 250.66 grounding electrode conductor sizing by service conductor size, 250.122 equipment grounding conductor sizing by OCPD rating, and the 25-ohm rod rule in 250.53(A)(2)

5For conduit fill, practice using Chapter 9 Table 1 (53% for 1 wire, 31% for 2 wires, 40% for 3+ wires) with Table 5 conductor dimensions and Table 4 raceway areas — or use Annex C directly when all conductors are the same size

Frequently Asked Questions

What score do I need to pass the ICC E2 exam?

The ICC E2 exam requires a scaled score of 75. ICC does not publish a fixed raw-to-scaled conversion, so do not interpret 75 as exactly 60 correct answers or 75% raw. Passing candidates receive a pass result rather than a numerical score.

Is the ICC E2 exam open-book?

Yes. ICC's E2 outline identifies the exam as open book. Verify the approved reference edition and alteration rules for the exact code cycle and delivery method selected in the current Exam Catalog.

How hard is the ICC E2 exam?

The official outline's two largest domains are Branch Circuit and Feeder Requirements (19%) and Wiring Methods and Distribution Systems (19%). Open-book testing still requires fast navigation and accurate application; ICC does not publish candidate difficulty or study-hour benchmarks.

Which codebook do I need for the ICC E2 exam?

ICC's E2 purchase flow requires a code-cycle selection. Verify the chosen cycle and its approved reference list in the current Exam Catalog. These local practice materials are 2023 NEC-aligned and should be paired with the matching E2 code-cycle selection.

What is the ICC E2 retake policy?

ICC permits six attempts at a National Certification exam within six months. After six attempts, a candidate must wait six months from the first attempt before registering again, and each attempt requires a new fee.

How do I prepare for the ICC E2 exam?

Start with the official eight-domain outline and the approved references for the selected code cycle. Practice locating the controlling rule, applying it to field conditions, and completing an 80-question session within 3.5 hours.

110+ Free ICC E2 Practice Questions

ICC Commercial Electrical Inspector (E2)

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