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100+ Free AL Low Voltage Systems Practice Questions

Prepare for the Alabama Low Voltage Special Systems (Under 50 Volts) Examination exam with instant access — no signup required.

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2026 Statistics

Key Facts: AL Low Voltage Systems Exam

70%

Passing Score

PSI AL GC Bulletin

50 Q

Official Exam Questions

PSI AL GC Bulletin

2 hours

Time Allowed

PSI AL GC Bulletin

$96

PSI Exam Fee

PSI AL GC Bulletin

Open book

Exam Format

PSI AL GC Bulletin

Alabama AL Low Voltage Systems trade exam via PSI: 50 questions, 70% pass, 2 hours, fee $96. Open-book specialty classification under the Alabama Licensing Board for General Contractors (bulletin 1/23/26).

Sample AL Low Voltage Systems Practice Questions

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

1What is the voltage limit that defines Alabama Low Voltage Special Systems work under this specialty classification?
A.25 volts or less
B.50 volts or less
C.100 volts or less
D.120 volts or less
Explanation: Alabama Low Voltage Special Systems licensing covers interior and exterior special systems, cabling, and interconnections operating at 50 volts or less. Work on circuits above 50 volts is outside this specialty classification and requires appropriate electrical licensing.
2Which NEC article covers Class 1, Class 2, and Class 3 remote-control, signaling, and power-limited circuits?
A.Article 700
B.Article 725
C.Article 760
D.Article 800
Explanation: NEC Article 725 governs Class 1, Class 2, and Class 3 remote-control, signaling, and power-limited circuits. These classifications determine power limits, cable types, and permitted wiring methods used throughout low-voltage special systems work.
3Which NEC article specifically covers fire alarm system wiring and equipment?
A.Article 700
B.Article 725
C.Article 760
D.Article 820
Explanation: NEC Article 760 covers installation of wiring and equipment for fire alarm systems, including power-limited fire alarm (PLFA) and non-power-limited fire alarm (NPLFA) circuits, cable types, and separation requirements.
4Ohm’s Law states that voltage (V) equals which relationship?
A.V = I / R
B.V = I × R
C.V = I + R
D.V = I² × R
Explanation: Ohm’s Law is V = I × R, where V is voltage in volts, I is current in amperes, and R is resistance in ohms. This relationship is fundamental for sizing power supplies, checking loads, and troubleshooting low-voltage circuits.
5A 24 VDC power supply is feeding a load that draws 2 A. What is the load resistance?
A.6 ohms
B.12 ohms
C.24 ohms
D.48 ohms
Explanation: Using Ohm’s Law, R = V / I = 24 V / 2 A = 12 ohms. Knowing load resistance helps verify power-supply capacity and diagnose shorted or open field devices on low-voltage systems.
6Power in a DC circuit is calculated as which of the following?
A.P = V / I
B.P = V × I
C.P = V + I
D.P = V − I
Explanation: Electrical power P (watts) equals voltage times current: P = V × I. Installers use this to size transformers, power supplies, and battery loads for alarm, access, and AV systems.
7Under NEC Article 725, Class 2 and Class 3 circuits are distinguished primarily by which characteristic?
A.Wire color only
B.Power and voltage limitations of the power source
C.Whether copper or aluminum conductors are used
D.Whether the circuit is AC or DC
Explanation: Class 2 and Class 3 status is defined by the listed power source’s voltage and power (VA) limits in NEC Chapter 9 Tables 11(A) and 11(B). Class 2 sources are considered safer from both fire and electric shock standpoints under their listed limits.
8Which cable marking is appropriate for Class 2 circuits installed in a plenum air-handling space?
A.CL2
B.CL2R
C.CL2P
D.CM
Explanation: CL2P designates Class 2 plenum cable, which meets the flame and smoke requirements for use in ducts, plenums, and other air-handling spaces under NEC Article 725. Using non-plenum cable in a plenum is a code violation.
9What does the letter “R” indicate in cable type FPLR?
A.Residential only
B.Riser rating for vertical runs between floors
C.Remote power limited
D.Red sheath required
Explanation: In fire alarm and communications cable designations, “R” means riser. FPLR is power-limited fire alarm riser cable suitable for vertical shafts between floors but not for plenum air-handling spaces unless also plenum-rated.
10Which power-limited fire alarm cable type is required in plenum spaces?
A.FPL
B.FPLR
C.FPLP
D.NPLF
Explanation: FPLP (Fire Power-Limited Plenum) cable is required for power-limited fire alarm circuits in plenum and other air-handling spaces because it has the required low smoke and flame-spread characteristics per NEC Article 760.

About the AL Low Voltage Systems Exam

The Alabama Low Voltage Special Systems (Under 50 Volts) Examination is a classification trade examination administered by PSI for the Alabama Licensing Board for General Contractors. The official open-book exam has 50 questions, a 70% (35 of 50 correct) passing standard, and 120 minutes allowed. PSI examination fee is $96 per attempt (bulletin updated 1/23/26). This English-language MCQ bank is a study aid for the trade knowledge on the official content outline; it is not an official PSI form, does not replace the required Business & Law exam for primes, and is not a substitute for board-approved experience or the official open-book examination.

Questions

50 scored questions

Time Limit

120 minutes

Passing Score

70%

Exam Fee

$96 (PSI Services LLC (for Alabama Licensing Board for General Contractors))

AL Low Voltage Systems Exam Content Outline

12%

Electrical and Electronic Knowledge

Basic electrical/electronic theory under 50V

10%

Sound and Video Systems

AV cabling and systems

8%

Intrusion Detection and Alarms

Security alarm systems

8%

Conductors

Low-voltage conductors

4%

Electrical Power Conditioning

Power conditioning for LV systems

58%

Special Systems Installation and Codes

Fire alarm interfaces, data/voice, controls, and installation standards

How to Pass the AL Low Voltage Systems Exam

What You Need to Know

  • Passing score: 70%
  • Exam length: 50 questions
  • Time limit: 120 minutes
  • Exam fee: $96

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

AL Low Voltage Systems Study Tips from Top Performers

1Study only the approved references listed for your classification in the current PSI Alabama General Contractors bulletin
2Practice open-book navigation with permanent tabs and indexes before test day
3Drill OSHA 29 CFR 1926 topics that appear across nearly every trade outline
4Work quantity takeoff and plan-reading problems under timed conditions
5Confirm Board eligibility and classification scope on genconbd.alabama.gov before scheduling with PSI

Frequently Asked Questions

How many questions are on the AL Low Voltage Systems exam?

The official PSI trade examination has 50 scored questions (plus possible experimental items). Passing is 70% (35 of 50 correct) within 120 minutes.

How much does the AL Low Voltage Systems exam cost?

PSI lists $96 per examination registration for this Alabama general contractor classification exam (Candidate Information Bulletin updated 1/23/26). License application fees to the Board are separate.

Is the Alabama specialty contractor exam open book?

Yes. PSI administers these classification exams as open book. Only the bulletin-listed approved references are allowed; temporary tabs like Post-it notes are prohibited.

Do I still need the Business and Law exam?

Prime contractor applicants must also pass the Alabama Business & Law examination (50 questions, 70%, 120 minutes). Reciprocity may waive a trade exam in some cases but does not waive Business & Law.