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100+ Free SC Heating Practice Questions

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2026 Statistics

Key Facts: SC Heating Exam

50 Q

Official Exam Questions

PSI SC Commercial Contractor CIB updated 5/15/2025

70%

Passing Score (35 of 50)

PSI SC Commercial Contractor CIB updated 5/15/2025

3 hours

Time Allowed

PSI SC Commercial Contractor CIB updated 5/15/2025

USD 75

PSI Exam Fee

PSI SC Commercial Contractor CIB updated 5/15/2025

Open Book

Book Policy

PSI SC Commercial Contractor CIB updated 5/15/2025

South Carolina Heating Contractor Examination is the official CLB/PSI open-book exam: 50 questions, 70% (35 of 50), 3 hours, USD 75 (bulletin updated 5/15/2025). Official delivery is English.

Sample SC Heating Practice Questions

Try these sample questions to test your SC Heating exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1South Carolina currently enforces which mechanical and fuel-gas codes for commercial heating work?
A.2015 IMC and 2015 IFGC with no state modifications
B.2021 International Mechanical Code and 2021 International Fuel Gas Code, each with South Carolina modifications, effective January 1, 2023
C.2018 Uniform Mechanical Code and NFPA 54 only
D.2024 IMC and 2024 IFGC adopted statewide without a Building Codes Council vote
Explanation: The South Carolina Building Codes Council adopted the 2021 South Carolina Mechanical Code and 2021 South Carolina Fuel Gas Code (2021 IMC/IFGC with SC modifications) on October 6, 2021, with a statewide effective date of January 1, 2023. The PSI Heating Contractor CIB allows either those 2021 codes or the earlier 2018 South Carolina editions listed as references. Fuel-gas appliances and gas piping are governed by the Fuel Gas Code, not by a stand-alone UMC adoption.
2Per 2021 IMC Section 303.3, a natural-draft gas furnace is prohibited in which location unless a listed exception applies?
A.A mechanical room that opens to a corridor
B.A basement utility room with a solid door to the living space
C.A sleeping room, bathroom, toilet room, storage closet, or surgical room
D.A garage if the ignition source is 18 inches above the floor
Explanation: IMC 303.3 prohibits fuel-fired appliances in sleeping rooms, bathrooms, toilet rooms, storage closets, and surgical rooms, and from taking combustion air from those rooms. Listed exceptions include direct-vent appliances that take all combustion air from outdoors, certain solid-fuel appliances, and appliances in a dedicated outdoor-air enclosure with a weather-stripped self-closing solid door. A garage installation is a different rule (elevation/protection), not a 303.3 prohibited room.
3In a private garage, equipment with an ignition source must be elevated so the ignition source is not less than how far above the floor, unless the appliance is listed as flammable-vapor-ignition resistant?
A.6 inches
B.12 inches
C.18 inches
D.24 inches
Explanation: IMC 304.3 and IFGC 305.3 require the ignition source to be not less than 18 inches above the floor in hazardous locations and in public, private, and repair garages, motor-fuel facilities, and parking garages. The elevation rule does not apply to appliances listed as flammable-vapor-ignition resistant. Separate rules then set appliance body clearances (6 feet in private garages, 8 feet in public garages) unless the unit is also protected from vehicle impact.
4Unless approved under the alternate-materials process, appliances regulated by the 2021 IMC must be which of the following?
A.Field-fabricated from any steel that meets ASTM A36
B.Listed and labeled for the application in which they are installed and used
C.Accepted if they carry only a manufacturer nameplate with no third-party mark
D.Converted to any available fuel without changing the listing
Explanation: IMC 301.7 requires appliances to be listed and labeled for the application in which they are installed and used, unless otherwise approved under Section 105. IMC 301.9 also requires a permanent factory nameplate with the manufacturer, model, serial number, and the mark of the approved agency, plus ratings and required clearances. Fuel conversion is allowed only where approved and done per the manufacturer's instructions without exceeding the altitude rating.
5Approval and installation of fuel-gas distribution piping, gas-fired appliances, and gas appliance vents in South Carolina are governed by which document?
A.South Carolina Fuel Gas Code (2021 IFGC with SC modifications)
B.NFPA 70 only
C.South Carolina Plumbing Code only
D.ASHRAE Standard 90.1 only
Explanation: IMC 301.6 sends fuel-gas piping, gas-fired appliances, and gas venting to the South Carolina Fuel Gas Code. IMC Chapter 7 likewise states that combustion and dilution air for gas-fired appliances are in the Fuel Gas Code; Chapter 7 covers oil (NFPA 31) and solid fuel (manufacturer's instructions). Electrical connections still follow NFPA 70, and potable-water connections follow the Plumbing Code, but those are not the gas-system installation code.
6Unless an exception applies, an attic containing a furnace must have a passageway not less than which dimensions, and not more than 20 feet long measured along the centerline?
A.24 inches high by 18 inches wide, with a 16-by-24-inch opening
B.30 inches high by 22 inches wide, with a clear access opening not less than 20 inches by 30 inches
C.36 inches high by 36 inches wide, with a 30-by-30-inch opening
D.48 inches high by 24 inches wide, with a 22-by-22-inch opening
Explanation: IMC 306.3 requires an unobstructed attic passageway not less than 30 inches high and 22 inches wide, not more than 20 feet long to the appliance, continuous solid flooring not less than 24 inches wide, a 30-by-30-inch level service space, and a clear opening not less than 20 inches by 30 inches and large enough to remove the largest appliance. A switch-controlled luminaire and a receptacle are required at or near the appliance. If the passageway is at least 6 feet high and 22 inches wide for its entire length, it may be up to 50 feet long.
7In front of the control side of an appliance, the 2021 IMC requires a level working space of not less than which size?
A.24 inches deep by 24 inches wide
B.30 inches deep by 30 inches wide
C.36 inches deep by 36 inches wide
D.48 inches deep by 30 inches wide
Explanation: IMC 306.1 (and the matching IFGC 306.1 text) requires a level working space not less than 30 inches deep and 30 inches wide in front of the control side so the appliance can be inspected, serviced, repaired, or replaced without disabling a fire-resistance-rated assembly or removing permanent construction, other appliances, vents, or unrelated piping and ducts.
8Unless protected from vehicle impact and installed under the ignition-source rules, an appliance in a public garage or repair garage shall be installed not less than how far above the floor?
A.18 inches
B.6 feet
C.8 feet
D.10 feet
Explanation: IMC 304.6 and IFGC 305.4 require appliances in public garages, motor-fuel facilities, repair garages, and other areas frequented by motor vehicles to be at least 8 feet above the floor. If vehicles can pass under the appliance, it must also be at least 1 foot higher than the tallest vehicle door opening and must keep the manufacturer's clearances. The exception allows a lower mounting only when the appliance is protected from vehicle impact and installed per the 18-inch ignition-source rule and NFPA 30A.
9Unless protected from vehicle impact and installed under IMC 304.3, appliances in a private garage or carport shall have a minimum clearance above the floor of which amount?
A.18 inches
B.3 feet
C.6 feet
D.8 feet
Explanation: IMC 304.7 requires a 6-foot clearance above the floor for appliances in private garages and carports, unless they are protected from motor-vehicle impact and installed per 304.3 (18-inch ignition-source elevation or FVIR listing). Do not apply the 8-foot public-garage rule to a private residential garage.
10Equipment installed at grade shall be supported in which manner?
A.Set directly on bare soil if the cabinet has a painted base
B.On a level concrete slab or other approved material extending not less than 3 inches above adjoining grade, or suspended not less than 6 inches above adjoining grade
C.On wood sleepers that hold the cabinet 1 inch above grade
D.On gravel only, with no slab, if the unit is listed for outdoor use
Explanation: IMC 304.10 and IFGC 305.7 require grade-level equipment to sit on a level concrete slab or other approved material extending not less than 3 inches above adjoining grade, or to be suspended not less than 6 inches above adjoining grade, and to follow the manufacturer's instructions. Direct soil contact and 1-inch wood sleepers do not meet the elevation or support rule.

About the SC Heating Exam

The South Carolina Heating Contractor Examination is the official CLB classification examination administered by PSI. The official exam has 50 scored questions. Passing is 70% (35 of 50) in 3 hours. The examination is open book. PSI lists USD 75 (South Carolina Commercial Contractor Candidate Information Bulletin updated 5/15/2025). All commercial general and mechanical contractor candidates must pass the Business Management and Law for Commercial Contractor Examination in addition to this technical examination. LLR charges a separate USD 350 license application fee. This bank is an English-language MCQ study adaptation. It does not replace required trade experience, board approval, financial statements or bonds, or the official examination.

Assessment

Open-book computer-based multiple-choice. Allowed references are listed in the South Carolina Commercial Contractor Candidate Information Bulletin updated 5/15/2025.

Time Limit

3 hours

Passing Score

70% (35 of 50)

Exam Fee

USD 75 (PSI Services LLC (for the South Carolina Contractor's Licensing Board))

SC Heating Exam Content Outline

16%

Code Compliance

Code Compliance (8 items)

8%

HARV General

HARV General (4 items)

8%

HARV Controls

HARV Controls (4 items)

14%

HARV Load Calculation

HARV Load Calculation (7 items)

12%

Fuel Gas Systems

Fuel Gas Systems (6 items)

12%

Piping

Piping (6 items)

6%

Ducts

Ducts (3 items)

14%

Boilers - Low Pressure

Boilers - Low Pressure (7 items)

10%

Boilers - High Pressure

Boilers - High Pressure (5 items)

How to Pass the SC Heating Exam

What You Need to Know

  • Passing score: 70% (35 of 50)
  • Assessment: Open-book computer-based multiple-choice. Allowed references are listed in the South Carolina Commercial Contractor Candidate Information Bulletin updated 5/15/2025.
  • Time limit: 3 hours
  • Exam fee: USD 75

Keys to Passing

  • Work through all 100 available questions
  • Review every answer and explanation
  • Track weak areas and revisit them
  • Use our AI tutor for tough concepts

SC Heating Study Tips from Top Performers

1Distribute study time to the official PSI content outline (bulletin updated 5/15/2025)
2Use only the PSI-listed references for this classification
3Temporary tabs such as Post-it notes are prohibited in the PSI center
4This bank is an English-language MCQ study aid, not an official PSI form

Frequently Asked Questions

How many questions are on the South Carolina Heating Contractor Examination?

The official PSI examination has 50 scored questions. Passing is 70% (35 of 50) within 3 hours (South Carolina Commercial Contractor Candidate Information Bulletin updated 5/15/2025).

How much does the SC Heating exam cost?

PSI lists USD 75 for this examination. The South Carolina Contractor's Licensing Board charges a separate USD 350 license application fee.

Is the SC Heating exam open book?

Yes. PSI lists the commercial contractor examinations as open book. Candidates may bring the PSI-listed references for this classification. Temporary tabs such as Post-it notes are prohibited.

Do I also need the Business Management and Law examination?

Yes. All commercial general and mechanical contractor candidates must pass the Business Management and Law for Commercial Contractor Examination in addition to this technical examination. Burglar and fire alarm candidates take the Alarm Code of Laws Examination instead.