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Key Facts: NV C-1G Gas Pipes and Vents Exam

50 Q

Official Exam Questions

PSI Nevada Contractor CIB updated 3/25/2026

70%

Passing Score

PSI Nevada Contractor CIB updated 3/25/2026

2 hours

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-1G Pipes and Vents for Gas Contractor Examination is the official NSCB/PSI open book exam: 50 questions, 70% (35 of 50 points), 2 hours, USD 95 (bulletin 270, updated 3/25/2026). Official delivery: English.

Sample NV C-1G Gas Pipes and Vents Practice Questions

Try these sample questions to review concepts for the NV C-1G Gas Pipes and Vents exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1Per NFPA 54 2012, the point of delivery for a natural-gas piping system (other than undiluted LP-gas) is which of the following?
A.The utility main in the street
B.The outlet of the service meter assembly or the outlet of the service regulator, whichever is farther downstream
C.The first appliance shutoff valve inside the building
D.The inlet of the customer-owned second-stage regulator
Explanation: NFPA 54 covers piping from the point of delivery to the appliance connections. For natural gas that point is the outlet of the service meter assembly or the outlet of the service regulator, whichever is farther downstream. Everything upstream of that point is the serving-gas supplier's piping, not the C-1G building system.
2The NFPA 54 2012 and UMC 2018 Schedule 40 metallic-pipe sizing tables for natural gas are based on which specific gravity?
A.0.60
B.1.00
C.1.50
D.2.00
Explanation: Natural-gas capacity tables in NFPA 54 Chapter 6 and UMC 2018 Table 1315.2(1) are computed for a specific gravity of 0.60. That is lighter than air, so leaked natural gas rises. Using the 1.50 propane gravity on a natural-gas job under-predicts flow and is the wrong table.
3Unless a listed outdoor-appliance exception applies, underground fuel-gas piping shall be installed with a minimum cover of which depth?
A.6 inches below finished grade
B.8 inches below finished grade
C.12 inches below finished grade
D.36 inches below finished grade, at frost line only
Explanation: NFPA 54 7.1.2.1 and UMC 2018 1310.1.1 require not less than 12 inches of cover on underground gas piping. Where external damage is likely, cover is increased to 18 inches, or the pipe is installed in conduit or bridged. Twelve inches is the ordinary minimum on the open-book C-1G.
4An approved individual underground line serving only an outdoor grill, gas light, or similar outdoor appliance, in a location not subject to physical damage, may be installed with a minimum cover of:
A.4 inches
B.8 inches
C.12 inches with no exception
D.18 inches
Explanation: NFPA 54 and UMC 2018 allow individual outdoor-appliance lines to be buried not less than 8 inches below finished grade when the installation is approved and is not in a location susceptible to physical damage. The general 12 inch rule still applies to building services and to any line that can be damaged.
5Polyethylene (PE) plastic fuel-gas pipe is permitted in which of the following locations?
A.Concealed in an interior partition chase
B.Outdoors, underground only, with a listed transition (typically an anodeless riser) where the pipe comes above grade
C.Exposed along an exterior building wall
D.Inside a mechanical room if it is sleeved in Schedule 40 steel
Explanation: NFPA 54 and UMC 2018 limit plastic gas pipe to outdoor underground use. Where the pipe must rise above grade it terminates in a listed premanufactured anodeless riser or service-head adapter. Plastic pipe shall not be used inside or under a building except for the listed riser/adapter exceptions.
6An underground nonmetallic fuel-gas pipe shall have a tracer that is not smaller than which of the following?
A.14 AWG bare aluminum, laid on top of the backfill
B.18 AWG yellow insulated copper wire, or another approved conductor, installed adjacent to the pipe with an accessible above-grade termination at each end
C.6 AWG bare copper, bonded to the electrical grounding electrode
D.No tracer is required if the pipe is PE listed for gas
Explanation: UMC 2018 / NFPA 54 require a yellow insulated copper tracer wire, or another approved conductor, adjacent to underground nonmetallic piping, not smaller than 18 AWG, with access to the tracer above grade at each end. The yellow insulation type must be suitable for direct burial. The tracer locates the plastic line; it is not a bonding jumper.
7Which statement about corrosion protection of underground steel fuel-gas piping is correct under NFPA 54 2012 / UMC 2018?
A.Factory zinc coating (galvanizing) is deemed adequate protection for underground steel gas pipe
B.Zinc coating (galvanizing) shall not be deemed adequate protection for underground gas piping; approved coating or wrapping is required
C.Bare black steel may be buried if the trench is sand-bedded
D.Only cathodic protection is acceptable; coatings are prohibited
Explanation: NFPA 54 7.1.3.1 and UMC 2018 1310.1.3.1 state that zinc coating (galvanizing) shall not be deemed adequate protection for underground gas piping. Steel in contact with earth needs an approved coating or wrapping, and uncoated threaded or socket-welded joints shall not be used in soil. Dissimilar-metal joints require an insulating fitting.
8A yellow-jacket CSST natural-gas piping system installed in a building shall be bonded to the electrical-service grounding electrode system with a jumper not smaller than:
A.14 AWG copper
B.10 AWG copper
C.6 AWG copper or equivalent
D.1/0 AWG copper
Explanation: NFPA 54 2012 7.13.2 and UMC 2018 1311.2 require CSST gas piping, and systems containing any CSST segment, to be electrically continuous and bonded to the electrical-service grounding electrode system. The bonding jumper shall not be smaller than 6 AWG copper or equivalent. Gas piping shall not be used as a grounding electrode.
9Which of the following uses of metallic fuel-gas piping is prohibited?
A.Bonding CSST to the electrical-service grounding electrode system
B.Using the gas piping as a grounding electrode
C.Supporting the pipe with metal hangers attached to the building structure
D.Connecting a listed appliance connector downstream of the shutoff valve
Explanation: NFPA 54 and UMC 2018 prohibit using gas piping as a grounding electrode. CSST must be bonded to the existing grounding electrode system, but the pipe itself is not an electrode. Using the pipe as an electrode can impress fault and lightning current on the gas system.
10Each gas appliance shall have an accessible approved manual shutoff valve in the same room and within what maximum distance of the appliance, installed upstream of any connector?
A.3 feet
B.6 feet
C.10 feet
D.25 feet if the valve is readily accessible
Explanation: UMC 2018 1312.5 / NFPA 54 9.6.4 require an accessible approved manual shutoff with a nondisplaceable valve member, or a listed gas convenience outlet, within 6 feet of the appliance it serves. Where a connector is used the valve is upstream of the connector. A meter valve does not replace the appliance shutoff.

About the NV C-1G Gas Pipes and Vents Exam

The Nevada C-1G Pipes and Vents for Gas Contractor Examination is the official Nevada State Contractors Board trade or management examination administered by PSI Services LLC. The official exam has 50 scored questions. Passing is 70% (35 of 50 points) in 2 hours. The examination is open book. Approved center references include UMC 2018 and NFPA 54 (2012) (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. This English-language MCQ bank is a study aid, not an official PSI form. It does not replace required trade experience, board approval, fingerprints, bonding, or the official examination.

Exam sponsor: PSI Services LLC (for the Nevada State Contractors Board). The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Assessment

Open Book computer-based multiple-choice. UMC 2018 and NFPA 54 (2012) (allowed in center)

Time Limit

2 hours

Passing Score

70% (35 of 50 points)

Exam / Certification Fees

USD 95

Exam sponsor website

Fees, eligibility, and exam policies can change. Confirm them with the exam sponsor before applying or paying.

Our practice resources: topics covered

We aim to reflect publicly available exam outlines and topic information in our study resources. Coverage, format, and difficulty may differ from the actual exam, and we cannot guarantee that every detail is accurate or current. Confirm exam requirements, fees, and policies with the official exam sponsor.

24%

Natural Gas Piping

Natural-gas piping (12 items)

24%

LP Gas Piping

LP-gas piping (12 items)

20%

Chimneys, Flues and Vents

Chimneys, flues, and vents (10 items)

10%

Appliance Installation

Gas appliance installation (5 items)

10%

Sizing and Estimating

Pipe sizing and estimating (5 items)

6%

Testing and Inspection

Testing and inspection (3 items)

6%

Combustion Air

Combustion air (3 items)

Preparing for the NV C-1G Gas Pipes and Vents Exam

What You Need to Know

  • Passing score: 70% (35 of 50 points)
  • Assessment: Open Book computer-based multiple-choice. UMC 2018 and NFPA 54 (2012) (allowed in center)
  • Time limit: 2 hours
  • Exam / certification fees: USD 95 Official sources

Using Our Practice Resources

  • 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-1G Gas Pipes and Vents: Suggested Study Strategy

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-1G Pipes and Vents for Gas Contractor Examination?

The official PSI examination has 50 scored questions. Passing is 70% (35 of 50 points) within 2 hours (Candidate Information Bulletin 270, updated 3/25/2026).

How much does the NV C-1G Gas Pipes and Vents 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-1G Gas Pipes and Vents exam open book?

Yes. PSI lists this examination as open book. UMC 2018 and NFPA 54 (2012) (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.