NEVADA (NV) C-2D LOW VOLTAGE PRACTICE TEST EXAM QUESTIONS AND CORRECT
ANSWERS (VERIFIED ANSWERS) PLUS RATIONALES 2026 Q&A |LATEST EXAM UPDATE
2026/2027.
Core Domains:
1. National Electrical Code (NEC) Rules for Low-Voltage Wiring
2. Nevada Contractors Board Regulations and Licensing Law (NRS 624)
3. Fire Alarm and Signaling Systems (NFPA 72)
4. Telecommunications, Data, and Structured Cabling (TIA/EIA Standards)
5. Access Control, CCTV, and Security Systems
6. Low-Voltage Circuit Theory, Ohms Law, and Power Calculations
7. Safety, Jobsite Management, and OSHA Compliance
Introduction:
The purpose of this examination is to evaluate the technical competence, practical field knowledge, and
regulatory awareness of candidates seeking licensure in low-voltage electrical systems. The assessment
covers fundamental theory, structured cabling standards, fire alarm signaling, security integration, and
statutory compliance specific to trade practices. Featuring a rigorous combination of direct multiple-
choice queries and complex, real-world operational scenarios, the test emphasizes applied professional
decision-making and adherence to current safety codes. Candidates must demonstrate critical analytical
skills to troubleshoot system failures, calculate operational parameters, and comply with state and
national technical standards.
According to the National Electrical Code, what is the maximum voltage rating for Class 2 remote-
control, signaling, and power-limited circuits under normal operating conditions?
A. 15 volts
,B. 30 volts
C. 50 volts
D. 100 volts
🟢 B. 30 volts
🔴 RATIONALE: Class 2 circuits are specifically defined by the National Electrical Code as having
a maximum voltage of 30 volts for alternating current or direct current under normal operating
conditions, limiting shock and fire hazards.
Which Nevada Revised Statute chapter governs the licensing, classifications, and disciplinary
procedures for general and specialty contractors in the state?
A. NRS chapter 616A
B. NRS chapter 624
C. NRS chapter 704
D. NRS chapter 477
🟢 B. NRS chapter 624
🔴 RATIONALE: NRS Chapter 624 is the primary body of Nevada state law that establishes the
State Contractors Board and outlines all requirements, scopes of work, and disciplinary actions for
contractors.
When installing fire alarm cable in a vertical riser through multiple floors in a commercial building,
what minimum cable rating is required by the NEC if not installed in conduit?
A. FPLP
B. FPLR
C. FPL
D. CM
🟢 B. FPLR
🔴 RATIONALE: Fire alarm cables installed in vertical risers require a riser-rated cable such as
,FPLR to prevent the vertical spread of fire from floor to floor, unless placed inside approved
metallic raceways.
What is the maximum pull tension typically recommended for standard 4-pair unshielded twisted
pair (UTP) category copper data cables during installation?
A. 10 pounds
B. 25 pounds
C. 50 pounds
D. 100 pounds
🟢 B. 25 pounds
🔴 RATIONALE: TIA/EIA structured cabling standards specify a maximum pulling tension of 25
pounds-force for standard 4-pair horizontal UTP cables to prevent internal conductor deformation
and degradation of high-frequency performance.
In a distributed audio system, an amplifier outputs a 70.3V constant-voltage line. If a speaker tap is
set to 5 watts, what is the approximate impedance presented by that speaker tap?
A. 250 ohms
B. 500 ohms
C. 990 ohms
D. 1250 ohms
🟢 C. 990 ohms
🔴 RATIONALE: Using the constant voltage impedance formula Z = V 2 /P , squaring 70.3 volts
gives approximately 4942.09, and dividing by 5 watts yields roughly 988.4 ohms, closest to the 990
ohms standard calculation.
Under Nevada law, within what timeframe must a licensed contractor notify the State Contractors
Board in writing of any change of address or personnel changes specified by statute?
A. 7 days
, B. 10 days
C. 30 days
D. 60 days
🟢 C. 30 days
🔴 RATIONALE: Contractors licensed in Nevada are required by administrative regulations under
NRS 624 to report changes in address, management, or organizational structure to the State
Contractors Board within 30 days.
Which NFPA standard governs the National Fire Alarm and Signaling Code used extensively for
commercial low-voltage fire system installations?
A. NFPA 70
B. NFPA 72
C. NFPA 101
D. NFPA 90A
🟢 B. NFPA 72
🔴 RATIONALE: NFPA 72 is the definitive standard governing the application, installation, location,
performance, and inspection of fire alarm systems and public emergency reporting systems.
What optical fiber color designation is standard for multimode OM3 and OM4 fiber optic connector
jackets or boot indicators per TIA-598?
A. Yellow
B. Orange
C. Aqua
D. Blue
🟢 C. Aqua
🔴 RATIONALE: Aqua is the standardized TIA-598 color code used to designate laser-optimized
50/125 micrometer multimode optical fiber cables such as OM3 and OM4.
ANSWERS (VERIFIED ANSWERS) PLUS RATIONALES 2026 Q&A |LATEST EXAM UPDATE
2026/2027.
Core Domains:
1. National Electrical Code (NEC) Rules for Low-Voltage Wiring
2. Nevada Contractors Board Regulations and Licensing Law (NRS 624)
3. Fire Alarm and Signaling Systems (NFPA 72)
4. Telecommunications, Data, and Structured Cabling (TIA/EIA Standards)
5. Access Control, CCTV, and Security Systems
6. Low-Voltage Circuit Theory, Ohms Law, and Power Calculations
7. Safety, Jobsite Management, and OSHA Compliance
Introduction:
The purpose of this examination is to evaluate the technical competence, practical field knowledge, and
regulatory awareness of candidates seeking licensure in low-voltage electrical systems. The assessment
covers fundamental theory, structured cabling standards, fire alarm signaling, security integration, and
statutory compliance specific to trade practices. Featuring a rigorous combination of direct multiple-
choice queries and complex, real-world operational scenarios, the test emphasizes applied professional
decision-making and adherence to current safety codes. Candidates must demonstrate critical analytical
skills to troubleshoot system failures, calculate operational parameters, and comply with state and
national technical standards.
According to the National Electrical Code, what is the maximum voltage rating for Class 2 remote-
control, signaling, and power-limited circuits under normal operating conditions?
A. 15 volts
,B. 30 volts
C. 50 volts
D. 100 volts
🟢 B. 30 volts
🔴 RATIONALE: Class 2 circuits are specifically defined by the National Electrical Code as having
a maximum voltage of 30 volts for alternating current or direct current under normal operating
conditions, limiting shock and fire hazards.
Which Nevada Revised Statute chapter governs the licensing, classifications, and disciplinary
procedures for general and specialty contractors in the state?
A. NRS chapter 616A
B. NRS chapter 624
C. NRS chapter 704
D. NRS chapter 477
🟢 B. NRS chapter 624
🔴 RATIONALE: NRS Chapter 624 is the primary body of Nevada state law that establishes the
State Contractors Board and outlines all requirements, scopes of work, and disciplinary actions for
contractors.
When installing fire alarm cable in a vertical riser through multiple floors in a commercial building,
what minimum cable rating is required by the NEC if not installed in conduit?
A. FPLP
B. FPLR
C. FPL
D. CM
🟢 B. FPLR
🔴 RATIONALE: Fire alarm cables installed in vertical risers require a riser-rated cable such as
,FPLR to prevent the vertical spread of fire from floor to floor, unless placed inside approved
metallic raceways.
What is the maximum pull tension typically recommended for standard 4-pair unshielded twisted
pair (UTP) category copper data cables during installation?
A. 10 pounds
B. 25 pounds
C. 50 pounds
D. 100 pounds
🟢 B. 25 pounds
🔴 RATIONALE: TIA/EIA structured cabling standards specify a maximum pulling tension of 25
pounds-force for standard 4-pair horizontal UTP cables to prevent internal conductor deformation
and degradation of high-frequency performance.
In a distributed audio system, an amplifier outputs a 70.3V constant-voltage line. If a speaker tap is
set to 5 watts, what is the approximate impedance presented by that speaker tap?
A. 250 ohms
B. 500 ohms
C. 990 ohms
D. 1250 ohms
🟢 C. 990 ohms
🔴 RATIONALE: Using the constant voltage impedance formula Z = V 2 /P , squaring 70.3 volts
gives approximately 4942.09, and dividing by 5 watts yields roughly 988.4 ohms, closest to the 990
ohms standard calculation.
Under Nevada law, within what timeframe must a licensed contractor notify the State Contractors
Board in writing of any change of address or personnel changes specified by statute?
A. 7 days
, B. 10 days
C. 30 days
D. 60 days
🟢 C. 30 days
🔴 RATIONALE: Contractors licensed in Nevada are required by administrative regulations under
NRS 624 to report changes in address, management, or organizational structure to the State
Contractors Board within 30 days.
Which NFPA standard governs the National Fire Alarm and Signaling Code used extensively for
commercial low-voltage fire system installations?
A. NFPA 70
B. NFPA 72
C. NFPA 101
D. NFPA 90A
🟢 B. NFPA 72
🔴 RATIONALE: NFPA 72 is the definitive standard governing the application, installation, location,
performance, and inspection of fire alarm systems and public emergency reporting systems.
What optical fiber color designation is standard for multimode OM3 and OM4 fiber optic connector
jackets or boot indicators per TIA-598?
A. Yellow
B. Orange
C. Aqua
D. Blue
🟢 C. Aqua
🔴 RATIONALE: Aqua is the standardized TIA-598 color code used to designate laser-optimized
50/125 micrometer multimode optical fiber cables such as OM3 and OM4.
