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100+ Free SC Fire Alarm Practice Questions

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2026 Statistics

Key Facts: SC Fire Alarm 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 Fire Alarm 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 Fire Alarm Practice Questions

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

1Ohm's law states that current (I) equals which relationship of voltage (V) and resistance (R)?

A.I = V × R

B.I = V / R

C.I = R / V

D.I = V² / R

Explanation: Ohm's law is I = V / R. Current in amperes equals voltage in volts divided by resistance in ohms. This relationship is the starting point for fire-alarm notification-circuit and battery calculations on the South Carolina Fire Alarm Contractor Examination.

2What is the SI unit of electrical resistance?

A.Ampere

B.Volt

C.Ohm

D.Watt

Explanation: Resistance is measured in ohms (Ω). One ohm is the resistance that allows one ampere to flow when one volt is applied. Amperes measure current, volts measure potential difference, and watts measure power.

3Per the 2020 NEC, which conductor identification is required for an equipment grounding conductor?

A.White or gray insulation only

B.Black, red, or blue insulation

C.Green, green with a yellow stripe, or bare copper

D.Orange insulation

Explanation: NEC 250.119 requires an equipment grounding conductor to be identified by a continuous green finish, green with one or more yellow stripes, or to be bare. White or gray is reserved for grounded (neutral) conductors, and orange is commonly used for a high-leg on a 4-wire delta.

4Which 2020 NEC article covers the installation of wiring and equipment for fire alarm systems?

A.Article 250

B.Article 300

C.Article 725

D.Article 760

Explanation: NEC Article 760, Fire Alarm Systems, governs installation of fire-alarm wiring and equipment, including non-power-limited (NPLFA) and power-limited (PLFA) circuits. South Carolina's PSI Fire Alarm examination is based on the 2020 NEC with South Carolina modifications.

5What is the primary purpose of an overcurrent protective device on a branch circuit?

A.To improve power factor

B.To protect conductors and equipment from excessive current

C.To convert AC to DC

D.To reduce voltage drop on long runs

Explanation: Overcurrent devices (fuses and circuit breakers) open the circuit when current exceeds the rating, protecting conductors and equipment from overload and short-circuit damage (NEC Article 240). They are not used to correct power factor, convert voltage, or reduce voltage drop.

6Per NEC 2020 Table 110.26(A)(1), what is the minimum depth of working space in front of 120/240-volt equipment under Condition 1 (exposed live parts on one side and no live or grounded parts on the other side)?

A.2 feet

B.3 feet

C.3 feet 6 inches

D.4 feet

Explanation: For 0–150 volts to ground, Table 110.26(A)(1) requires 3 feet of working-space depth under Conditions 1, 2, and 3. A typical 120/240-volt panel is 120 volts to ground, so the 3-foot rule applies. The space must also be at least 30 inches wide and 6½ feet high.

7Per NEC 2020 240.4(D), unless specifically permitted otherwise, what is the maximum overcurrent protection for a 14 AWG copper conductor?

A.10 amperes

B.15 amperes

C.20 amperes

D.25 amperes

Explanation: The small-conductor rule in 240.4(D) limits 14 AWG copper to 15 amperes, 12 AWG copper to 20 amperes, and 10 AWG copper to 30 amperes, even if Table 310.16 would appear to allow more. Fire-alarm branch circuits that use 14 AWG copper must follow this limit.

8Per the 2020 NEC, a grounded (neutral) conductor 6 AWG or smaller is generally identified by which insulation color?

A.Green or bare

B.White or gray

C.Black or red

D.Yellow or orange

Explanation: NEC 200.6 generally requires a grounded conductor 6 AWG or smaller to have a continuous white or gray outer finish, or three continuous white or gray stripes. Green or bare identifies an equipment grounding conductor.

9What is the purpose of lockout/tagout before working on a fire-alarm power circuit?

A.To increase available fault current

B.To prevent unexpected re-energizing of the circuit while work is performed

C.To satisfy battery-sizing requirements in NFPA 72

D.To identify the circuit as a Class 2 power-limited circuit

Explanation: Lockout/tagout isolates energy sources and prevents unexpected re-energizing while conductors or equipment are being serviced. OSHA 29 CFR 1910.147 and good electrical practice require it before work on energized or potentially energized circuits, including the dedicated fire-alarm branch circuit.

10In a series circuit, which quantity is the same through every component?

A.Voltage drop

B.Power dissipation

C.Current

D.Resistance

Explanation: In a series circuit there is only one current path, so the same current flows through every component. Voltage divides across the resistances in proportion to their ohmic values, and power (I²R) is therefore different if the resistances differ.

About the SC Fire Alarm Exam

The South Carolina Fire Alarm 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). Candidates must also pass the Alarm Code of Laws Examination. NTS Level I or NICET Level II is required. This commercial contractor fire alarm examination is distinct from the generic sc-fire-alarm-installer bank. Candidates must also pass the Alarm Code of Laws Examination. They do not take the Business Management and Law for Commercial Contractor 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 Fire Alarm Exam Content Outline

30%

General Electrical Knowledge

General Electrical Knowledge (15 items)

30%

Low Voltage

Low Voltage (15 items)

40%

Fire Detection and Alarm Systems

Fire Detection and Alarm Systems (20 items)

How to Pass the SC Fire Alarm 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 Fire Alarm 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 Fire Alarm 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 Fire Alarm 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 Fire Alarm 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.

What extra requirements apply to the SC fire alarm classification?

Candidates must pass this technical examination and the Alarm Code of Laws Examination. NTS Level I or NICET Level II is required. Work experience is not an examination prerequisite. This is the CLB commercial fire alarm examination, not a generic installer test.