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100+ Free NV C-2D Low Voltage Practice Questions

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2026 Statistics

Key Facts: NV C-2D Low Voltage Exam

35 Q

Official Exam Questions

PSI Nevada Contractor CIB updated 3/25/2026

25 of 35 points

Passing Score

PSI Nevada Contractor CIB updated 3/25/2026

1 hour

Time Allowed

PSI Nevada Contractor CIB updated 3/25/2026

USD 95

PSI Exam Fee (one portion)

PSI Nevada Contractor CIB updated 3/25/2026

Open Book

Book Policy

PSI Nevada Contractor CIB updated 3/25/2026

Nevada C-2D Low Voltage Contractor Examination is the official NSCB/PSI open book exam: 35 questions, 25 of 35 points, 1 hour, USD 95 (bulletin 270, updated 3/25/2026). Official delivery: English and Spanish.

Sample NV C-2D Low Voltage Practice Questions

Try these sample questions to test your NV C-2D Low Voltage exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1Which 2017 NEC article covers audio signal processing, amplification, and reproduction equipment, including permanently installed sound systems?
A.Article 640
B.Article 645
C.Article 725
D.Article 760
Explanation: NEC Article 640 applies to audio signal processing, amplification, and reproduction equipment and to the wiring and equipment used for sound-reinforcement and similar systems. Nevada C-2D work commonly includes these sound systems when they operate within the classification voltage limit.
2Which 2017 NEC article covers communications circuits such as telephone and similar premises communications wiring?
A.Article 725
B.Article 770
C.Article 800
D.Article 820
Explanation: NEC Article 800 covers communications circuits, including telephone and other premises communications cable and their protectors, grounding, and installation. Chapter 8 is independent of Chapters 1 through 7 except where Article 800 specifically references another rule.
3Under the 2017 NEC communications cable substitution hierarchy, which listed cable type is permitted as a substitute for Type CMR riser cable?
A.Type CM
B.Type CMG
C.Type CMX
D.Type CMP
Explanation: NEC 800.154 and Figure 800.154(A) allow a higher fire-rated communications cable to substitute for a lower-rated type. Type CMP (communications plenum) sits above Type CMR (riser) and may replace CMR, CMG, CM, and CMX. A lower-rated cable cannot replace a higher-rated one.
4Per 2017 NEC 800.48, unlisted outside-plant communications cable may enter a building for not more than which length, measured from the point of entrance, if it is kept out of risers and environmental-air spaces and is terminated on a listed primary protector or in an enclosure?
A.25 feet
B.50 feet
C.100 feet
D.10 feet
Explanation: NEC 800.48 permits unlisted outside-plant communications cable inside a building for not more than 50 feet (15 m) from the point of entrance when it is not in a riser or environmental-air space and it terminates in an enclosure or on a listed primary protector. The 2017 Code also allows the point of entrance to be extended by continuously enclosing the entrance cable in RMC or IMC.
5According to 2017 NEC 90.3, how does Chapter 8 (Communications Systems) apply relative to Chapters 1 through 7?
A.Chapter 8 always modifies Chapters 1 through 4 the same way Chapters 5 through 7 do
B.Chapter 8 is independent of Chapters 1 through 7 except where it specifically references a rule in those chapters
C.Chapter 8 applies only if the Authority Having Jurisdiction adopts it separately from the NEC
D.Chapter 8 is informational only and is not enforceable
Explanation: NEC 90.3 states that Chapters 1 through 4 apply generally, Chapters 5 through 7 supplement or modify those chapters, and Chapter 8 is independent except where it specifically references another chapter. That is why communications fill, support, and grounding are found in Articles 770, 800, 810, 820, 830, and 840 rather than assumed from Chapter 3.
6Which 2017 NEC optical fiber cable type is nonconductive and listed for use in ducts, plenums, and other spaces used for environmental air?
A.Type OFNP
B.Type OFCR
C.Type OFNG
D.Type OFNR
Explanation: NEC 770.179 lists Type OFNP as optical fiber nonconductive plenum cable, suitable for ducts, plenums, and other environmental-air spaces because it is fire-resistant and low-smoke. The “N” means nonconductive (no metallic members); the “P” means plenum.
7Under 2017 NEC 840.160, when communications cable also carries power to communications equipment at more than 60 watts, the installation must comply with which additional requirement?
A.Section 725.144, using communications cable in place of Class 2 or Class 3 cable
B.Article 760 power-limited fire alarm rules
C.No additional ampacity rule; any listed CM cable may carry unlimited power
D.Article 690 photovoltaic rules
Explanation: The 2017 NEC added 840.160 for premises powering of communications equipment over communications cable (including many Power over Ethernet installations). Cable may carry communications and power, but if the power exceeds 60 watts the installation must comply with 725.144, using communications cable in place of Class 2/3 cable. Section 725.144 and Table 725.144 address heating in bundled data/power cable.
8A 70-volt distributed sound system has ten loudspeakers. Each speaker transformer is tapped at 5 watts. Ignoring transformer insertion loss, what is the minimum amplifier output power required to drive the line at those taps?
A.35 watts
B.50 watts
C.70 watts
D.5 watts
Explanation: In a 70-volt (constant-voltage) distributed sound system, each speaker draws the wattage of its transformer tap from the amplifier. Ten speakers at 5 watts each require 50 watts of audio power, plus any design headroom the specifier adds. The 70-volt rating is the nominal distribution voltage, not the required amplifier wattage.
9What is the minimum size of a copper grounding conductor for a receiving-station antenna mast or antenna discharge unit under 2017 NEC 810.21?
A.12 AWG copper
B.10 AWG copper
C.6 AWG copper
D.14 AWG copper
Explanation: NEC 810.21(H) requires the antenna grounding conductor to be not smaller than 10 AWG copper, 17 AWG copper-clad steel or bronze, or 8 AWG aluminum or copper-clad aluminum. Article 810 stands alone from Article 800, so the 14 AWG communications-protector minimum in 800.100 does not set the antenna-mast size.
10Where a coaxial CATV cable with a metallic shield enters a building, 2017 NEC 820.93 generally requires which action at the building entrance?
A.Ground the outer conductive shield of the coaxial cable
B.Install a Class 1 power-limited transformer on the shield
C.Replace the coaxial cable with Type NM-B inside the wall
D.Leave the shield floating so noise does not enter the premises wiring
Explanation: NEC 820.93 requires the outer conductive shield of a coaxial cable to be grounded as close as practicable to the point of entrance. Bonding/grounding of that shield then follows 820.100 so the CATV system and the power grounding-electrode system stay at the same potential.

About the NV C-2D Low Voltage Exam

The Nevada C-2D Low Voltage Contractor Examination is the official Nevada State Contractors Board trade or management examination administered by PSI Services LLC. The official exam has 35 scored questions. Passing is 25 of 35 points in 1 hour. The examination is open book. Approved center references include National Electrical Code, 2017 (allowed in center). PSI lists USD 95 for one examination portion and USD 140 if taken with CMS; otherwise USD 95 per trade exam (Candidate Information Bulletin updated 3/25/2026). NSCB requires a separate CMS examination for most new applicants, plus a USD 300 application fee and a USD 600 biennial license fee. PSI also offers this examination in Spanish; this bank is an English-language MCQ study adaptation, not an official translation. It does not replace required trade experience, board approval, fingerprints, bonding, or the official examination.

Assessment

Open Book computer-based multiple-choice. National Electrical Code, 2017 (allowed in center)

Time Limit

1 hour

Passing Score

25 of 35 points

Exam Fee

USD 95 (PSI Services LLC (for the Nevada State Contractors Board))

NV C-2D Low Voltage Exam Content Outline

14%

Sound and Communications

Sound and communications (5 items)

14%

Services, Feeders, Branch Circuits and Overcurrent Protection

Services and overcurrent (5 items)

14%

Conductors

Low-voltage conductors (5 items)

17%

General Knowledge and Calculations

General knowledge and calculations (6 items)

11%

Grounding and Bonding

Grounding and bonding (4 items)

9%

Power Supplies

Power supplies (3 items)

14%

Intrusion Alarm Systems

Intrusion alarms (5 items)

3%

Utilization and General Use Equipment

Utilization equipment (1 item)

3%

Raceways and Enclosures

Raceways and enclosures (1 item)

How to Pass the NV C-2D Low Voltage Exam

What You Need to Know

  • Passing score: 25 of 35 points
  • Assessment: Open Book computer-based multiple-choice. National Electrical Code, 2017 (allowed in center)
  • Time limit: 1 hour
  • Exam fee: USD 95

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

NV C-2D Low Voltage Study Tips from Top Performers

1Distribute study time to the official bulletin 270 content outline (updated 3/25/2026)
2Use only the PSI-listed references; temporary tabs such as Post-it notes are prohibited
3Confirm NSCB experience documentation before scheduling with PSI
4This bank is an English-language MCQ study aid, not an official PSI form

Frequently Asked Questions

How many questions are on the Nevada C-2D Low Voltage Contractor Examination?

The official PSI examination has 35 scored questions. Passing is 25 of 35 points within 1 hour (Candidate Information Bulletin 270, updated 3/25/2026).

How much does the NV C-2D Low Voltage exam cost?

PSI lists USD 95 for one examination portion. Two portions cost USD 140 only if the second portion is CMS. NSCB charges a separate USD 300 application fee and USD 600 biennial license fee.

Is the NV C-2D Low Voltage exam open book?

Yes. PSI lists this examination as open book. National Electrical Code, 2017 (allowed in center)

Do I still need the CMS examination?

CMS is the required Nevada business-and-law examination. Most new applicants must pass CMS and a trade examination for the requested classification. In most cases you will not retake an exam if you have actively served as a qualified employee in the same classification within the last four years.