Updated Nevada C-2D Low Voltage Practice Exam 2026 -2027
DESCRIPTION
The Nevada C-2D Low Voltage license is an open-book trade certification for
contractors installing systems up to 91 volts, including fiber optics, networking,
audio/video, and security alarms.
Exam Summary
• Trade Exam: 35 questions | 60 minutes | 70% to pass.
• CMS Exam: 60 questions | 120 minutes | 75% to pass (Business & Law).
• Provider: All exams are administered by PSI.
Core Topics
• NEC Standards: Heavy focus on Articles
725 (Control), 770 (Fiber), 800 (Comms), and 250 (Grounding).
• Electrical Theory: Mastery of Ohm’s Law (
) and Watt’s Law (
).
• System Knowledge: Circuitry (Series/Parallel), Voltage Drop calculations,
and Conduit Fill limits.
• Safety: OSHA standards and Class C fire prevention.
Key Licensing Requirements
• Experience: 4 years of verifiable journeyman-level experience.
• Financial: Must provide a financial statement and a Surety Bond.
• Law: Must provide a Notice to Owner regarding liens for residential work.
2026 Question And ANSWER Latest Update
,1. A low-voltage system is generally defined as operating at or below:
A. 24 volts
B. 50 volts
C. 120 volts
D. 240 volts
Answer: B
The NEC generally defines low voltage (Class 2 and Class 3 circuits) as systems operating at 50
volts or less.
2. Class 2 circuits are limited primarily to reduce risk of:
A. Data loss
B. Electrical shock and fire
C. Signal interference
D. Voltage drop
Answer: B
Class 2 power supplies limit current and voltage to reduce fire and shock hazards.
3. When running low-voltage cable in the same pathway as 120V conductors, you
must:
A. Tape the cables together
B. Maintain separation unless rated for the same enclosure
C. Use smaller wire
D. Increase voltage
Answer: B
NEC requires separation between power-limited and non-power-limited conductors unless
properly rated or separated by barriers.
4. Plenum-rated cable (CMP) is required when installed in:
A. Underground conduit
B. Open air
C. Air-handling spaces
D. Exterior walls
2026 Question And ANSWER Latest Update
,Answer: C
CMP cable is fire-rated for air-handling (plenum) spaces to reduce toxic smoke and flame
spread.
5. A fire alarm control panel battery must provide backup power for at least:
A. 30 minutes
B. 4 hours
C. 24 hours (standby) plus alarm time
D. 72 hours
Answer: C
Fire alarm systems typically require 24-hour standby power plus additional alarm duration per
code.
6. Twisted pair cabling reduces:
A. Voltage
B. Heat
C. Electromagnetic interference (EMI)
D. Power consumption
Answer: C
Twisting pairs helps cancel electromagnetic interference.
7. What is the maximum horizontal run length for standard Cat6 Ethernet
cable?
A. 50 meters
B. 90 meters
C. 150 meters
D. 200 meters
Answer: B
Structured cabling standards limit horizontal runs to 90 meters (295 feet).
8. Low-voltage cables penetrating fire-rated walls must be:
2026 Question And ANSWER Latest Update
, A. Painted red
B. Bundled tightly
C. Fire-stopped with approved materials
D. Wrapped in tape
Answer: C
Fire-rated assemblies must be restored using approved fire-stopping systems.
9. A PoE (Power over Ethernet) device receives power at approximately:
A. 12V
B. 24V
C. 48V
D. 120V
Answer: C
PoE typically operates around 48 volts DC.
10. Shielded cable is most appropriate in environments with:
A. Low humidity
B. High EMI
C. Low voltage drop
D. Short runs
Answer: B
Shielding reduces interference in electrically noisy environments.
11. Access control systems commonly use which type of wiring?
A. Coaxial only
B. Twisted pair and low-voltage multi-conductor cable
C. 12/2 Romex
D. Aluminum feeder cable
Answer: B
Access control uses multi-conductor low-voltage cable for readers, strikes, and controls.
2026 Question And ANSWER Latest Update
DESCRIPTION
The Nevada C-2D Low Voltage license is an open-book trade certification for
contractors installing systems up to 91 volts, including fiber optics, networking,
audio/video, and security alarms.
Exam Summary
• Trade Exam: 35 questions | 60 minutes | 70% to pass.
• CMS Exam: 60 questions | 120 minutes | 75% to pass (Business & Law).
• Provider: All exams are administered by PSI.
Core Topics
• NEC Standards: Heavy focus on Articles
725 (Control), 770 (Fiber), 800 (Comms), and 250 (Grounding).
• Electrical Theory: Mastery of Ohm’s Law (
) and Watt’s Law (
).
• System Knowledge: Circuitry (Series/Parallel), Voltage Drop calculations,
and Conduit Fill limits.
• Safety: OSHA standards and Class C fire prevention.
Key Licensing Requirements
• Experience: 4 years of verifiable journeyman-level experience.
• Financial: Must provide a financial statement and a Surety Bond.
• Law: Must provide a Notice to Owner regarding liens for residential work.
2026 Question And ANSWER Latest Update
,1. A low-voltage system is generally defined as operating at or below:
A. 24 volts
B. 50 volts
C. 120 volts
D. 240 volts
Answer: B
The NEC generally defines low voltage (Class 2 and Class 3 circuits) as systems operating at 50
volts or less.
2. Class 2 circuits are limited primarily to reduce risk of:
A. Data loss
B. Electrical shock and fire
C. Signal interference
D. Voltage drop
Answer: B
Class 2 power supplies limit current and voltage to reduce fire and shock hazards.
3. When running low-voltage cable in the same pathway as 120V conductors, you
must:
A. Tape the cables together
B. Maintain separation unless rated for the same enclosure
C. Use smaller wire
D. Increase voltage
Answer: B
NEC requires separation between power-limited and non-power-limited conductors unless
properly rated or separated by barriers.
4. Plenum-rated cable (CMP) is required when installed in:
A. Underground conduit
B. Open air
C. Air-handling spaces
D. Exterior walls
2026 Question And ANSWER Latest Update
,Answer: C
CMP cable is fire-rated for air-handling (plenum) spaces to reduce toxic smoke and flame
spread.
5. A fire alarm control panel battery must provide backup power for at least:
A. 30 minutes
B. 4 hours
C. 24 hours (standby) plus alarm time
D. 72 hours
Answer: C
Fire alarm systems typically require 24-hour standby power plus additional alarm duration per
code.
6. Twisted pair cabling reduces:
A. Voltage
B. Heat
C. Electromagnetic interference (EMI)
D. Power consumption
Answer: C
Twisting pairs helps cancel electromagnetic interference.
7. What is the maximum horizontal run length for standard Cat6 Ethernet
cable?
A. 50 meters
B. 90 meters
C. 150 meters
D. 200 meters
Answer: B
Structured cabling standards limit horizontal runs to 90 meters (295 feet).
8. Low-voltage cables penetrating fire-rated walls must be:
2026 Question And ANSWER Latest Update
, A. Painted red
B. Bundled tightly
C. Fire-stopped with approved materials
D. Wrapped in tape
Answer: C
Fire-rated assemblies must be restored using approved fire-stopping systems.
9. A PoE (Power over Ethernet) device receives power at approximately:
A. 12V
B. 24V
C. 48V
D. 120V
Answer: C
PoE typically operates around 48 volts DC.
10. Shielded cable is most appropriate in environments with:
A. Low humidity
B. High EMI
C. Low voltage drop
D. Short runs
Answer: B
Shielding reduces interference in electrically noisy environments.
11. Access control systems commonly use which type of wiring?
A. Coaxial only
B. Twisted pair and low-voltage multi-conductor cable
C. 12/2 Romex
D. Aluminum feeder cable
Answer: B
Access control uses multi-conductor low-voltage cable for readers, strikes, and controls.
2026 Question And ANSWER Latest Update
