Illinois Commerce Commission (ICC) Certified Contractor Exam — Questions and Answers

Question 1: In Illinois, small claims court can be used to resolve contractor disputes involving amounts up to:

$10,000 (Correct answer)
$5,000
$2,500
$25,000

Correct answer: $10,000

Illinois small claims court handles civil disputes involving $10,000 or less, making it accessible for smaller contractor-client disputes.

Question 2: If a client refuses to pay for completed work, an ICC contractor's most direct legal remedy in Illinois is to:

Remove all installed materials from the property
Hire a collections agency only
File a mechanics lien and potentially sue for payment (Correct answer)
Report the client to the ICC

Correct answer: File a mechanics lien and potentially sue for payment

Filing a mechanics lien preserves the contractor's legal claim against the property and creates leverage to secure payment or pursue court action.

Question 3: Why should an ICC contractor always obtain a signed lien waiver from subcontractors before issuing final payment?

It substitutes for a final inspection
It satisfies OSHA recordkeeping requirements
It is required by the ICC for certification renewal
It confirms the subcontractor waives their right to file a lien once paid (Correct answer)

Correct answer: It confirms the subcontractor waives their right to file a lien once paid

A signed lien waiver confirms that upon receiving payment, the subcontractor releases their right to place a lien on the property.

Question 4: Which public utility did not file its annual ethics report with the Illinois Commerce Commission as required by the Climate and Equitable Jobs Act (CEJA)?

Ameren Illinois Company
Northern Illinois Gas Company
Commonwealth Edison
Mid-American Energy Company (Correct answer)

Correct answer: Mid-American Energy Company

Mid-American Energy did not file their annual report in May of 2025 per statute.

Question 5: What is the primary purpose of erosion and sediment controls on Illinois construction sites?

To reduce noise pollution
To reduce dust in dry weather
To comply with OSHA trenching regulations
To prevent sediment-laden stormwater from polluting nearby waterways (Correct answer)

Correct answer: To prevent sediment-laden stormwater from polluting nearby waterways

Erosion controls such as silt fences and inlet protection prevent disturbed soil from washing into streams and storm drains.

Question 6: What is a key process for managing changes in a project?

Disregarding stakeholder feedback during changes
Implementing change management processes (Correct answer)
Adjusting project scopes without documentation
Ignoring changes to adhere to the original plan

Correct answer: Implementing change management processes

Implementing processes to manage changes in scope, budget, or schedule is crucial for minimizing disruption in project management.

Question 7: Arbitration differs from mediation because arbitration:

Requires both parties to hire lawyers
Only applies to disputes over $100,000
Results in a binding decision imposed by the arbitrator (Correct answer)
Is always free of charge

Correct answer: Results in a binding decision imposed by the arbitrator

In arbitration, the arbitrator reviews evidence and issues a binding decision, similar to a judge but outside of the court system.

Question 8: Under 49 CFR Part 192, what is the minimum cover depth required for natural gas distribution pipelines installed in normal soil conditions?

30 inches
18 inches
12 inches
24 inches (Correct answer)

Correct answer: 24 inches

49 CFR Part 192 requires a minimum of 24 inches of cover for natural gas distribution lines installed in normal soil to provide adequate protection from surface loads and third-party damage.

Question 9: Who bears legal responsibility for locating and physically marking the position of underground natural gas facilities prior to excavation under Illinois law?

The natural gas utility (pipeline operator) (Correct answer)
The local municipality or county
The property owner on whose land the work occurs
The excavating contractor

Correct answer: The natural gas utility (pipeline operator)

Under Illinois' JULIE One-Call law, the pipeline operator (natural gas utility) is responsible for locating and marking the position of its underground facilities in response to a dig notice.

Question 10: In Illinois, what is the maximum voltage permitted for temporary wiring used during construction?

There is no maximum for temporary wiring
600V (Correct answer)
240V
120V

Correct answer: 600V

Temporary wiring used during construction is permitted up to 600 volts under NEC guidelines adopted in Illinois.

Question 11: In Illinois, who is responsible for ensuring that underground storage tanks (USTs) discovered during excavation are properly reported?

The local fire chief only
Only the property owner
No reporting is needed if the tank is empty
The contractor who discovers them must report to Illinois EPA (Correct answer)

Correct answer: The contractor who discovers them must report to Illinois EPA

Contractors who discover USTs during excavation are required to report them to Illinois EPA regardless of whether the tank appears empty.

Question 12: Under Illinois law, what right does a homeowner have if a contractor solicits work at their door without being invited?

A 3-day right to cancel the contract (Right of Rescission) (Correct answer)
The right to negotiate a 20% discount
The right to demand a background check
No special rights — the contract is immediately binding

Correct answer: A 3-day right to cancel the contract (Right of Rescission)

Illinois and federal law provide consumers a 3-business-day right to cancel contracts signed in their home following an unsolicited sales visit.

Question 13: What is the first recommended step when an ICC contractor and a client have a payment dispute?

Attempt to resolve the dispute through direct negotiation or mediation (Correct answer)
Report the client to the ICC
File a lawsuit immediately
Stop all work and abandon the project

Correct answer: Attempt to resolve the dispute through direct negotiation or mediation

Direct negotiation or mediation is the fastest and least expensive first step to resolve contractor-client payment disputes before pursuing legal remedies.

Question 14: When performing work near an Illinois water supply well, a contractor must maintain what minimum horizontal setback distance from the wellhead?

25 feet
200 feet
50 feet (Correct answer)
5 feet

Correct answer: 50 feet

Illinois regulations typically require a minimum 50-foot horizontal setback from a private water supply well for most construction activities.

Question 15: Which electrical code serves as the primary reference for wiring installations in Illinois?

OSHA 1910
National Electrical Code (NEC) (Correct answer)
Illinois Fire Prevention Code
ICC Mechanical Code

Correct answer: National Electrical Code (NEC)

The National Electrical Code (NEC) is the standard reference adopted in Illinois for all electrical wiring and installation work.

Question 16: Which of the following changes did Commonwealth Edison (ComEd) implement in 2025 as part of its ethics and compliance program?

All of the above. (Correct answer)
Updating its Code of Business Conduct and guidelines on political contributions.
Transitioning executive oversight of the Enterprise Risk Management function.
Enhancing cybersecurity resources to comply with applicable obligations.

Correct answer: All of the above.

ComEd implemented several material changes in 2025, including updating its Code of Business Conduct, guidelines on political contributions, transitioning executive oversight of the Enterprise Risk Management function, and enhancing cybersecurity resources.

Question 17: Which pipe material is prohibited from use in new natural gas distribution main or service line installations?

Polyethylene (PE) pipe
Cast iron pipe (Correct answer)
Copper tubing for service lines
Steel pipe

Correct answer: Cast iron pipe

Cast iron pipe is prohibited for new natural gas installations due to its brittleness and susceptibility to cracking; 49 CFR Part 192 does not permit cast iron for new construction.

Question 18: What is the minimum age requirement to apply for an ICC contractor certification in Illinois?

18 (Correct answer)
16
25
21

Correct answer: 18

Applicants must be at least 18 years old to apply for an ICC contractor certification in Illinois.

Question 19: Which Illinois permit is required before discharging stormwater from a construction site into a waterway?

Local municipal water permit
NPDES Construction General Permit (issued by Illinois EPA) (Correct answer)
ICC Operating Permit
Army Corps of Engineers Section 404 permit only

Correct answer: NPDES Construction General Permit (issued by Illinois EPA)

The NPDES Construction General Permit from Illinois EPA is required to authorize stormwater discharges from construction sites.

Question 20: When a natural gas main is taken out of service for repairs, what procedure is required before work begins?

No special procedures are needed for repairs lasting less than 8 hours
Purge the main with inert gas and follow proper isolation and lockout/tagout procedures (Correct answer)
Only install tape barriers around the work area
Leave the main open to atmosphere after closing the upstream valve

Correct answer: Purge the main with inert gas and follow proper isolation and lockout/tagout procedures

Mains taken out of service must be purged of residual gas using inert gas (such as nitrogen) and properly isolated through lockout/tagout to prevent ignition hazards during repair operations.

Question 21: An ICC contractor who moves their business to a new address must:

Notify the ICC of the address change (Correct answer)
Post a new bond only
Apply for a brand-new certification
Surrender their current certification

Correct answer: Notify the ICC of the address change

Contractors are required to keep their contact information current with the ICC, including notifying the agency of any address changes.

Question 22: In Illinois, how long must ICC contractors generally retain project records and documentation after project completion?

10 years
6 months
1 year
3 years (Correct answer)

Correct answer: 3 years

Illinois contractors should retain project documentation for a minimum of 3 years to comply with potential audit, warranty, or legal requirements.

Question 23: When working near energized electrical equipment, Illinois contractors must follow which safety standard?

ASHRAE 90.1
NFPA 13
ICC A117.1
OSHA 29 CFR 1910.333 (Electrical Safety) (Correct answer)

Correct answer: OSHA 29 CFR 1910.333 (Electrical Safety)

OSHA 29 CFR 1910.333 establishes safety-related work practices that apply when working on or near energized electrical equipment.

Question 24: What is required for a member of the public to speak at an ICC open meeting?

They must have a formal complaint against a utility.
They can speak without any prior notice.
They must be a registered lobbyist.
They must submit a request at least 24 hours in advance. (Correct answer)

Correct answer: They must submit a request at least 24 hours in advance.

Members of the public wishing to address the ICC must submit a request at least 24 hours in advance to be granted approval to speak at an open meeting.

Question 25: Which type of conduit is required in areas exposed to physical damage in Illinois commercial buildings?

Flexible metallic conduit
Electrical Metallic Tubing (EMT)
Rigid Metal Conduit (RMC) (Correct answer)
PVC Schedule 40

Correct answer: Rigid Metal Conduit (RMC)

Rigid Metal Conduit (RMC) provides the highest physical protection and is required in areas subject to physical damage.

Question 26: In Illinois, contractors must provide homeowners with a written contract for home repair projects costing more than:

$1,000
$100
$500 (Correct answer)
$5,000

Correct answer: $500

Illinois law requires written contracts for home repair and remodeling projects exceeding $500 to protect both homeowners and contractors.

Question 27: Illinois contractors generating hazardous waste on job sites must comply with which federal program?

Resource Conservation and Recovery Act (RCRA) hazardous waste rules (Correct answer)
OSHA Hazard Communication Standard
Clean Air Act Title V
Safe Drinking Water Act

Correct answer: Resource Conservation and Recovery Act (RCRA) hazardous waste rules

RCRA establishes the framework for hazardous waste management from generation through disposal, and applies to contractors who generate such waste.

Question 28: Which Illinois state agency is responsible for issuing ICC contractor certifications?

Illinois EPA
Illinois Department of Labor
Illinois Commerce Commission (Correct answer)
Illinois Secretary of State

Correct answer: Illinois Commerce Commission

The Illinois Commerce Commission oversees and issues certifications for contractors working in regulated utility and commerce sectors.

Question 29: Which Illinois regulatory body has primary jurisdiction over the safety of natural gas pipelines operated by public utilities in the state?

Illinois Department of Natural Resources
Illinois Commerce Commission (Correct answer)
Illinois State Fire Marshal
Illinois Environmental Protection Agency

Correct answer: Illinois Commerce Commission

The Illinois Commerce Commission (ICC) has primary jurisdiction over natural gas pipeline safety for public utilities operating in Illinois, adopting and enforcing federal pipeline safety standards.

Question 30: Before excavating near underground utilities in Illinois, contractors are legally required to call:

The local fire department
The property owner's insurance company
JULIE (811 — Joint Utility Locating Information for Excavators) (Correct answer)
OSHA directly

Correct answer: JULIE (811 — Joint Utility Locating Information for Excavators)

Illinois law requires contractors to call JULIE (811) at least 48 hours before excavating to have underground utilities marked.

Illinois Commerce Commission (ICC) Certified Contractor Exam

The ICC Certified Contractor exam certifies contractors and installers in Illinois who perform energy efficiency work, testing knowledge of contractor licensing requirements, electrical and natural gas systems safety, environmental compliance, utility regulations, and project management under the Illinois Commerce Commission's Part 462 rules.

Questions

35 min

Time Limit

70%

To Pass

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These practice questions were written with AI tools. They are not real exam questions. Exam facts are checked against the official sources listed below. Not reviewed by a subject-matter expert. Editorial policy

Sources & references

Exam facts on this page (fees, format, dates, passing scores) are checked against these official sources; the date is our last check. Editorial policy

ilga.gov — Test delivery, late registration, renewal, score validity, eligibility, fees · verified Oct 2026
icc.illinois.gov — Eligibility, fees · verified Oct 2026