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100+ Free SC Lightning Protection Practice Questions

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2026 Statistics

Key Facts: SC Lightning Protection 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 60

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 Lightning Protection Systems Contractor Examination is the official CLB/PSI open-book exam: 50 questions, 70% (35 of 50), 3 hours, USD 60 (bulletin updated 5/15/2025). Official delivery is English.

Sample SC Lightning Protection Practice Questions

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

1Per NFPA 780 (2020), Class I lightning-protection materials are required on ordinary structures of what maximum height?
A.50 ft (15 m)
B.75 ft (23 m)
C.100 ft (30 m)
D.150 ft (46 m)
Explanation: NFPA 780 Table 4.1.1.1.1 requires Class I materials on structures not exceeding 75 ft (23 m) in height. Structures taller than 75 ft must use the heavier Class II materials in Table 4.1.1.1.2. Height is measured to the highest protected roof or strike-termination level.
2What is the minimum cross-sectional area of a Class I main copper lightning conductor in NFPA 780 (2020)?
A.41,740 circular mils
B.52,620 circular mils
C.57,400 circular mils
D.115,000 circular mils
Explanation: NFPA 780 Table 4.1.1.1.1 lists 57,400 circular mils as the minimum Class I main copper conductor area, with a corresponding minimum weight of 187 lb per 1,000 ft. That value is larger than #3 AWG (52,620 CM) and is the Class I copper baseline used throughout Chapter 4.
3What is the minimum cross-sectional area of a Class I main aluminum lightning conductor in NFPA 780 (2020)?
A.57,400 circular mils
B.66,360 circular mils
C.98,600 circular mils
D.115,000 circular mils
Explanation: Table 4.1.1.1.1 requires Class I main aluminum conductors to have at least 98,600 circular mils and a minimum weight of 95 lb per 1,000 ft, with each strand not smaller than 14 AWG. Aluminum must be larger than copper of the same class because it has lower conductivity.
4What is the minimum cross-sectional area of a Class II main copper lightning conductor in NFPA 780 (2020)?
A.57,400 circular mils
B.83,690 circular mils
C.105,600 circular mils
D.115,000 circular mils
Explanation: Table 4.1.1.1.2 requires Class II main copper conductors to have at least 115,000 circular mils. That is roughly twice the Class I copper area and is used on structures taller than 75 ft, where stroke current and mechanical exposure are treated as more severe.
5What is the minimum diameter of a solid Class I copper air terminal in NFPA 780 (2020)?
A.1/4 in (6.4 mm)
B.3/8 in (9.5 mm)
C.1/2 in (12.7 mm)
D.5/8 in (15.9 mm)
Explanation: Table 4.1.1.1.1 lists 3/8 in (9.5 mm) as the minimum solid Class I copper air-terminal diameter. Aluminum Class I terminals must be larger (1/2 in) because aluminum is mechanically softer and less conductive than copper.
6What is the minimum diameter of a solid Class II copper air terminal in NFPA 780 (2020)?
A.3/8 in (9.5 mm)
B.1/2 in (12.7 mm)
C.5/8 in (15.9 mm)
D.3/4 in (19.1 mm)
Explanation: Table 4.1.1.1.2 requires solid Class II copper air terminals to be at least 1/2 in (12.7 mm) in diameter. Class II aluminum solid terminals step up again to 5/8 in. Class II hardware is used on structures taller than 75 ft.
7What is the minimum diameter of a solid Class I aluminum air terminal in NFPA 780 (2020)?
A.3/8 in (9.5 mm)
B.1/2 in (12.7 mm)
C.5/8 in (15.9 mm)
D.3/4 in (19.1 mm)
Explanation: Table 4.1.1.1.1 requires solid Class I aluminum air terminals to be at least 1/2 in (12.7 mm). Aluminum terminals are specified larger than the matching copper Class I size (3/8 in) to provide comparable conductivity and mechanical strength.
8A Class I main copper conductor must have at least 57,400 circular mils. What is the smallest standard AWG size that meets that NFPA 780 (2020) area?
A.4 AWG (41,740 CM)
B.3 AWG (52,620 CM)
C.2 AWG (66,360 CM)
D.1 AWG (83,690 CM)
Explanation: 4 AWG (41,740 CM) and 3 AWG (52,620 CM) are both smaller than 57,400 CM. 2 AWG at 66,360 CM is the smallest standard AWG that exceeds the Class I copper listing. NFPA 780 sizes lightning conductors by circular mils and weight, not by NEC ampacity tables.
9What is the minimum weight of a Class I main copper lightning conductor per 1,000 ft in NFPA 780 (2020)?
A.95 lb per 1,000 ft
B.187 lb per 1,000 ft
C.250 lb per 1,000 ft
D.375 lb per 1,000 ft
Explanation: Table 4.1.1.1.1 pairs the 57,400 CM Class I copper area with a minimum weight of 187 lb per 1,000 ft. Weight is an independent acceptance check because a conductor can meet area and still be under-weight if the stranding or alloy is wrong.
10An ordinary commercial building in South Carolina measures 80 ft from grade to the highest roof. Which NFPA 780 (2020) material class is required?
A.Class I only, because the building is under 100 ft
B.Class II materials for the entire lightning protection system
C.Class I on the roof and Class II only on down conductors
D.Either class, at the installer's option
Explanation: Structures exceeding 75 ft (23 m) require Class II materials per Table 4.1.1.1.2. An 80 ft building is over that limit, so air terminals, main roof conductors, and down conductors must all meet Class II sizes. Mixing classes on the same ordinary structure is not a permitted shortcut.

About the SC Lightning Protection Exam

The South Carolina Lightning Protection Systems 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 60 (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 60 (PSI Services LLC (for the South Carolina Contractor's Licensing Board))

SC Lightning Protection Exam Content Outline

56%

NFPA 780

NFPA 780 (28 items)

22%

General Theory

General Theory (11 items)

22%

NEC

NEC (11 items)

How to Pass the SC Lightning Protection 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 60

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 Lightning Protection 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 Lightning Protection Systems 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 Lightning Protection exam cost?

PSI lists USD 60 for this examination. The South Carolina Contractor's Licensing Board charges a separate USD 350 license application fee.

Is the SC Lightning Protection 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.