New Mexico (NM) JG Journeyman Natural Gas Fitter
Ultimate Practice Exam Prep Document | 2026/2027 Edition |
200 Verified Questions
New Mexico (NM) JG Journeyman Natural Gas Fitter Exam 2026-2027 QUESTIONS AND ANSWERS ALREADY
GRADED A+. 100% Verified Solutions | Updated Per Latest Guidelines | Graded A+
This comprehensive practice exam is meticulously designed for candidates preparing for the New
Mexico Journeyman Natural Gas Fitter (JG) licensure examination. It features 200 verified questions
that mirror the actual exam's scope and difficulty, covering all critical domains of natural gas fitting.
Each question is accompanied by detailed answers and rationales to reinforce understanding and ensure
exam readiness. Updated for the 2026-2027 academic year, this resource is an indispensable tool for
achieving a passing score.
Key Features:
Gas piping system design and installation
Appliance venting and combustion air requirements
Pressure testing and leak detection procedures
New Mexico code regulations and safety standards
Troubleshooting and repair of gas systems
Updates for 2026:
- Revised to align with the latest 2026 New Mexico Plumbing and Mechanical Code amendments
- Incorporated new questions on high-efficiency condensing appliances and their venting
- Updated safety protocols to reflect current NFPA 54 and International Fuel Gas Code standards
- Enhanced explanations with step-by-step problem-solving approaches
- Added scenario-based questions to simulate real-world field challenges
Abstract:
This practice examination is a scholarly compilation of 200 rigorously verified questions, each designed to assess
the competencies required of a Journeyman Natural Gas Fitter in New Mexico. The content is systematically
organized to cover the essential domains of gas fitting, including system design, installation, venting, pressure
testing, and code compliance. Each question is accompanied by a detailed answer and rationale, providing a
comprehensive learning experience that bridges theoretical knowledge and practical application. The examination
reflects the most current industry standards and New Mexico-specific regulations, ensuring that candidates are
fully prepared for the licensure exam. With a focus on critical thinking and problem-solving, this resource is an
invaluable aid for both initial certification and continuing education. The structured format allows for
self-assessment and targeted study, making it an essential component of any serious exam preparation strategy.
Keywords:
Journeyman Gas Fitter, New Mexico JG Exam, Natural Gas Fitting, Gas Piping, Venting, Pressure Testing, Fuel
Gas Code, Licensure Prep
Answer Format:
Each question is presented in a multiple-choice format, followed by the correct answer clearly indicated. A
comprehensive explanation is provided for each answer, detailing the reasoning and referencing relevant codes or
standards. Incorrect options are also analyzed to clarify common misconceptions and reinforce learning.
Compliance Checklist:
Aligned with New Mexico Administrative Code (NMAC) Title 14, Chapter 6
Page 1
, Incorporates 2026 updates to the International Fuel Gas Code (IFGC)
References NFPA 54: National Fuel Gas Code
Includes OSHA safety standards for gas fitting operations
Covers all exam content areas as specified by the New Mexico Construction Industries Division
Content Area Overview:
Content Area Questions Key Topics Weight
Gas Piping System Design and 1-40 Pipe sizing, materials, fittings, supports, 20%
Installation installation methods
Appliance Venting and 41-80 Vent types, sizing, termination, combustion 20%
Combustion Air air supply, draft hoods
Pressure Testing and Leak 81-120 Test procedures, gauges, leak detection 20%
Detection methods, safety precautions
New Mexico Code and Safety 121-160 NMAC rules, permit requirements, 20%
Regulations inspections, safety standards
Troubleshooting and Repair 161-200 Common faults, diagnostic techniques, 20%
repair procedures, system maintenance
Page 2
,Q1. A 12-inch horizontal gas line passes through an unvented space. The line is to be
installed with a clearance of 6 inches from a recessed light fixture. Which code
provision applies?
A. No clearance required if the fixture is rated for insulation contact
B. 6 inches is acceptable per NFPA 54
C. A 1-inch clearance is required for all gas piping
D. Clearance must be at least 12 inches from any heat source
Correct Answer: B. 6 inches is acceptable per NFPA 54
Rationale: NFPA 54 (National Fuel Gas Code) requires a minimum clearance of 6 inches
between gas piping and heat sources such as recessed fixtures, unless the fixture is listed
for zero clearance. A 6-inch clearance satisfies this requirement. Option A is incorrect
because even IC-rated fixtures still require the 6-inch clearance. Option C is too small,
and Option D overstates the requirement.
Why Wrong:
A - IC-rated fixtures reduce insulation clearance but do not alter the 6-inch piping
clearance.
C - 1-inch clearance is insufficient for heat sources per code.
D - 12 inches is not universally required; 6 inches is the standard.
Reference: NFPA 54/ANSI Z223.1, Section 7.1.5
Q2. A natural gas system supplies a 100,000 BTU/hr furnace and a 50,000 BTU/hr
water heater. The longest run from the meter is 60 feet. Using the standard gas piping
capacity table (0.5-inch pipe, 0.5-inch WC drop), what is the minimum pipe size for
the main line?
A. 1/2 inch
B. 3/4 inch
C. 1 inch
D. 1-1/4 inch
Correct Answer: B. 3/4 inch
Rationale: Total load is 150,000 BTU/hr. For a 60-foot run with 0.5-inch WC pressure
drop, a 3/4-inch pipe can carry up to approximately 160,000 BTU/hr (per standard
tables). 1/2-inch pipe is limited to about 100,000 BTU/hr at that length, so it is insufficient.
1-inch would be oversized but not required; 1-1/4 inch is excessive.
Why Wrong:
A - 1/2-inch pipe cannot handle 150,000 BTU/hr over 60 feet.
C - 1-inch pipe is larger than necessary, though it would work.
D - 1-1/4 inch is significantly oversized for this load.
Reference: NFPA 54, Table 402.4(2)
Page 3
, Q3. A gas fitter must pressure-test a new 2-inch steel gas line. The test pressure is 60
psig. What is the maximum allowable pressure drop during a 30-minute test if the
system is isolated and the temperature is stable?
A. 0 psig (no drop allowed)
B. 0.5 psig
C. 1 psig
D. 2 psig
Correct Answer: A. 0 psig (no drop allowed)
Rationale: Per NFPA 54, when testing with air or inert gas at pressures above 10 psig, the
test must hold for at least 30 minutes with no measurable drop. A 0.5, 1, or 2 psig drop
would indicate a leak and fail the test.
Why Wrong:
B - Any measurable drop indicates a leak.
C - Any measurable drop fails the test.
D - Any measurable drop fails the test.
Reference: NFPA 54, Section 7.2.2
Q4. A gas appliance vent connector passes through a combustible wall. What is the
minimum clearance required if the connector is Type B vent and the wall has a
thickness of 4 inches?
A. 1 inch
B. 2 inches
C. 6 inches
D. No clearance needed if insulated
Correct Answer: A. 1 inch
Rationale: Type B vent connectors require a minimum 1-inch clearance from combustible
materials. This is a standard code requirement. A 6-inch clearance is for single-wall
connectors, and 2 inches is not specified. Insulation does not eliminate the clearance
requirement.
Why Wrong:
B - 2 inches is not the standard for Type B vent.
C - 6 inches applies to single-wall metal connectors.
D - Insulation does not reduce clearance requirements for Type B vent.
Reference: NFPA 54, Section 7.4.4
Q5. A gas fitter is installing a 1-inch polyethylene (PE) gas line underground. The
trench depth is 18 inches. What additional protection is required?
A. No additional protection needed at this depth
Page 4
Ultimate Practice Exam Prep Document | 2026/2027 Edition |
200 Verified Questions
New Mexico (NM) JG Journeyman Natural Gas Fitter Exam 2026-2027 QUESTIONS AND ANSWERS ALREADY
GRADED A+. 100% Verified Solutions | Updated Per Latest Guidelines | Graded A+
This comprehensive practice exam is meticulously designed for candidates preparing for the New
Mexico Journeyman Natural Gas Fitter (JG) licensure examination. It features 200 verified questions
that mirror the actual exam's scope and difficulty, covering all critical domains of natural gas fitting.
Each question is accompanied by detailed answers and rationales to reinforce understanding and ensure
exam readiness. Updated for the 2026-2027 academic year, this resource is an indispensable tool for
achieving a passing score.
Key Features:
Gas piping system design and installation
Appliance venting and combustion air requirements
Pressure testing and leak detection procedures
New Mexico code regulations and safety standards
Troubleshooting and repair of gas systems
Updates for 2026:
- Revised to align with the latest 2026 New Mexico Plumbing and Mechanical Code amendments
- Incorporated new questions on high-efficiency condensing appliances and their venting
- Updated safety protocols to reflect current NFPA 54 and International Fuel Gas Code standards
- Enhanced explanations with step-by-step problem-solving approaches
- Added scenario-based questions to simulate real-world field challenges
Abstract:
This practice examination is a scholarly compilation of 200 rigorously verified questions, each designed to assess
the competencies required of a Journeyman Natural Gas Fitter in New Mexico. The content is systematically
organized to cover the essential domains of gas fitting, including system design, installation, venting, pressure
testing, and code compliance. Each question is accompanied by a detailed answer and rationale, providing a
comprehensive learning experience that bridges theoretical knowledge and practical application. The examination
reflects the most current industry standards and New Mexico-specific regulations, ensuring that candidates are
fully prepared for the licensure exam. With a focus on critical thinking and problem-solving, this resource is an
invaluable aid for both initial certification and continuing education. The structured format allows for
self-assessment and targeted study, making it an essential component of any serious exam preparation strategy.
Keywords:
Journeyman Gas Fitter, New Mexico JG Exam, Natural Gas Fitting, Gas Piping, Venting, Pressure Testing, Fuel
Gas Code, Licensure Prep
Answer Format:
Each question is presented in a multiple-choice format, followed by the correct answer clearly indicated. A
comprehensive explanation is provided for each answer, detailing the reasoning and referencing relevant codes or
standards. Incorrect options are also analyzed to clarify common misconceptions and reinforce learning.
Compliance Checklist:
Aligned with New Mexico Administrative Code (NMAC) Title 14, Chapter 6
Page 1
, Incorporates 2026 updates to the International Fuel Gas Code (IFGC)
References NFPA 54: National Fuel Gas Code
Includes OSHA safety standards for gas fitting operations
Covers all exam content areas as specified by the New Mexico Construction Industries Division
Content Area Overview:
Content Area Questions Key Topics Weight
Gas Piping System Design and 1-40 Pipe sizing, materials, fittings, supports, 20%
Installation installation methods
Appliance Venting and 41-80 Vent types, sizing, termination, combustion 20%
Combustion Air air supply, draft hoods
Pressure Testing and Leak 81-120 Test procedures, gauges, leak detection 20%
Detection methods, safety precautions
New Mexico Code and Safety 121-160 NMAC rules, permit requirements, 20%
Regulations inspections, safety standards
Troubleshooting and Repair 161-200 Common faults, diagnostic techniques, 20%
repair procedures, system maintenance
Page 2
,Q1. A 12-inch horizontal gas line passes through an unvented space. The line is to be
installed with a clearance of 6 inches from a recessed light fixture. Which code
provision applies?
A. No clearance required if the fixture is rated for insulation contact
B. 6 inches is acceptable per NFPA 54
C. A 1-inch clearance is required for all gas piping
D. Clearance must be at least 12 inches from any heat source
Correct Answer: B. 6 inches is acceptable per NFPA 54
Rationale: NFPA 54 (National Fuel Gas Code) requires a minimum clearance of 6 inches
between gas piping and heat sources such as recessed fixtures, unless the fixture is listed
for zero clearance. A 6-inch clearance satisfies this requirement. Option A is incorrect
because even IC-rated fixtures still require the 6-inch clearance. Option C is too small,
and Option D overstates the requirement.
Why Wrong:
A - IC-rated fixtures reduce insulation clearance but do not alter the 6-inch piping
clearance.
C - 1-inch clearance is insufficient for heat sources per code.
D - 12 inches is not universally required; 6 inches is the standard.
Reference: NFPA 54/ANSI Z223.1, Section 7.1.5
Q2. A natural gas system supplies a 100,000 BTU/hr furnace and a 50,000 BTU/hr
water heater. The longest run from the meter is 60 feet. Using the standard gas piping
capacity table (0.5-inch pipe, 0.5-inch WC drop), what is the minimum pipe size for
the main line?
A. 1/2 inch
B. 3/4 inch
C. 1 inch
D. 1-1/4 inch
Correct Answer: B. 3/4 inch
Rationale: Total load is 150,000 BTU/hr. For a 60-foot run with 0.5-inch WC pressure
drop, a 3/4-inch pipe can carry up to approximately 160,000 BTU/hr (per standard
tables). 1/2-inch pipe is limited to about 100,000 BTU/hr at that length, so it is insufficient.
1-inch would be oversized but not required; 1-1/4 inch is excessive.
Why Wrong:
A - 1/2-inch pipe cannot handle 150,000 BTU/hr over 60 feet.
C - 1-inch pipe is larger than necessary, though it would work.
D - 1-1/4 inch is significantly oversized for this load.
Reference: NFPA 54, Table 402.4(2)
Page 3
, Q3. A gas fitter must pressure-test a new 2-inch steel gas line. The test pressure is 60
psig. What is the maximum allowable pressure drop during a 30-minute test if the
system is isolated and the temperature is stable?
A. 0 psig (no drop allowed)
B. 0.5 psig
C. 1 psig
D. 2 psig
Correct Answer: A. 0 psig (no drop allowed)
Rationale: Per NFPA 54, when testing with air or inert gas at pressures above 10 psig, the
test must hold for at least 30 minutes with no measurable drop. A 0.5, 1, or 2 psig drop
would indicate a leak and fail the test.
Why Wrong:
B - Any measurable drop indicates a leak.
C - Any measurable drop fails the test.
D - Any measurable drop fails the test.
Reference: NFPA 54, Section 7.2.2
Q4. A gas appliance vent connector passes through a combustible wall. What is the
minimum clearance required if the connector is Type B vent and the wall has a
thickness of 4 inches?
A. 1 inch
B. 2 inches
C. 6 inches
D. No clearance needed if insulated
Correct Answer: A. 1 inch
Rationale: Type B vent connectors require a minimum 1-inch clearance from combustible
materials. This is a standard code requirement. A 6-inch clearance is for single-wall
connectors, and 2 inches is not specified. Insulation does not eliminate the clearance
requirement.
Why Wrong:
B - 2 inches is not the standard for Type B vent.
C - 6 inches applies to single-wall metal connectors.
D - Insulation does not reduce clearance requirements for Type B vent.
Reference: NFPA 54, Section 7.4.4
Q5. A gas fitter is installing a 1-inch polyethylene (PE) gas line underground. The
trench depth is 18 inches. What additional protection is required?
A. No additional protection needed at this depth
Page 4
