Page 1 of 80
Wisconsin (WI) JOURNEYMAN PLUMBER Restricted
Appliance Exam Actual Test Questions and Correct
Answers With Rationales LATEST THIS YEAR
EXAM COVERAGE (Point Form)
• WI State Plumbing Code (SPS 382 & SPS 384): General plumbing requirements, material
standards, fixture clearances, and cross-connection control.
• Restricted Appliance Scope: Gas piping (sizing, materials, installation), venting (Category I, II, III,
IV), combustion air, appliance connections.
• International Fuel Gas Code (IFGC) – WI Amendments: Gas pipe sizing (longest run method),
pressure regulators, manual shut-off valves, drip legs.
• Specific Appliances: Water heaters (tank, tankless, power vent, direct vent), boilers (hydronic),
furnaces, unit heaters, pool heaters, infrared heaters.
• Venting Systems: Type B, Type L, AL29-4C, PVC/CPVC for condensing appliances, common
venting, vent connectors, draft hoods.
• Combustion Air: Indoor/outdoor methods, grille sizing, louver specifications, mechanical
combustion air.
• Gas Pipe Materials: Black steel, CSST (counterstrike protection), polyethylene (outdoor), copper
(if allowed locally).
• Pressure Testing: Air or inert gas, test pressure (1.5x working, not less than 3 psi for 10 min,
then 6” WC for 30 min).
• Gas Meter & Regulator: Location, venting, sediment traps, service line sizing.
• Safety Devices: T&P relief valves (temperature & pressure), BFP (backflow preventer), thermal
expansion tanks, high-limit controls.
• WI License Law: Scope of Restricted Appliance (gas piping to appliances, no sanitary drainage),
supervision ratios, continuing education.
200 MULTIPLE CHOICE QUESTIONS
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1. Under Wisconsin SPS 382, what is the minimum burial depth for a residential gas service line
(plastic) in a non-traffic area?
A) 12 inches
B) 18 inches
C) 24 inches
D) 36 inches
Answer: B) 18 inches
*Rationale: WI SPS 382.41 requires 18" cover for plastic gas lines in private non-traffic areas; 24" if
under a driveway.*
2. A restricted appliance plumber in Wisconsin may legally install which of the following?
A) Drain, waste, and vent piping
B) Gas piping from the meter to a boiler
C) Water service pipe inside a building
D) Sewer ejector pump
Answer: B) Gas piping from the meter to a boiler
Rationale: Restricted Appliance license limits work to gas piping and related appliance connections; no
sanitary drainage or water service.
3. What is the maximum allowable pressure drop for low-pressure gas systems (6-7” WC) from the
meter to the farthest appliance?
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A) 0.1” WC
B) 0.3” WC
C) 0.5” WC
D) 1.0” WC
Answer: C) 0.5” WC
*Rationale: IFGC 402.4.2 allows 0.5" WC drop for low-pressure systems; high-pressure systems (over 14"
WC) allow 1 psi drop.*
4. A 50-gallon storage water heater requires a T&P relief valve set to open at:
A) 150 psi and 150°F
B) 150 psi and 210°F
C) 125 psi and 200°F
D) 100 psi and 180°F
Answer: B) 150 psi and 210°F
Rationale: ASME code for water heaters – T&P opens at 150 psi or 210°F, whichever occurs first, to
prevent explosion.
5. When using CSST (corrugated stainless steel tubing) inside a building in Wisconsin, what additional
protection is required?
A) Dielectric unions
B) Arc-resistant jacket or bonding
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C) Plastic coating only
D) Vapor barrier
Answer: B) Arc-resistant jacket or bonding
Rationale: WI adopted amendments require CSST to be bonded to the building’s grounding electrode
system to reduce lightning-induced puncture risk.
6. The minimum combustion air opening for a gas furnace located in a confined space (room <50
cu.ft./1000 Btu) using the indoor air method, with louvered grilles, must be:
*A) 1 sq.in./1000 Btu*
*B) 1 sq.in./2000 Btu*
*C) 1 sq.in./3000 Btu*
*D) 1 sq.in./4000 Btu*
*Answer: A) 1 sq.in./1000 Btu*
*Rationale: IFGC 304.5.1 – Two openings (upper/lower) each 1 sq.in./1000 Btu, but not less than
100 sq.in.*
7. A Category IV gas appliance (condensing) vent system must be:
A) Type B gas vent
B) Masonry chimney
*C) PVC, CPVC, or stainless steel (AL29-4C)*
D) Single-wall galvanized
Wisconsin (WI) JOURNEYMAN PLUMBER Restricted
Appliance Exam Actual Test Questions and Correct
Answers With Rationales LATEST THIS YEAR
EXAM COVERAGE (Point Form)
• WI State Plumbing Code (SPS 382 & SPS 384): General plumbing requirements, material
standards, fixture clearances, and cross-connection control.
• Restricted Appliance Scope: Gas piping (sizing, materials, installation), venting (Category I, II, III,
IV), combustion air, appliance connections.
• International Fuel Gas Code (IFGC) – WI Amendments: Gas pipe sizing (longest run method),
pressure regulators, manual shut-off valves, drip legs.
• Specific Appliances: Water heaters (tank, tankless, power vent, direct vent), boilers (hydronic),
furnaces, unit heaters, pool heaters, infrared heaters.
• Venting Systems: Type B, Type L, AL29-4C, PVC/CPVC for condensing appliances, common
venting, vent connectors, draft hoods.
• Combustion Air: Indoor/outdoor methods, grille sizing, louver specifications, mechanical
combustion air.
• Gas Pipe Materials: Black steel, CSST (counterstrike protection), polyethylene (outdoor), copper
(if allowed locally).
• Pressure Testing: Air or inert gas, test pressure (1.5x working, not less than 3 psi for 10 min,
then 6” WC for 30 min).
• Gas Meter & Regulator: Location, venting, sediment traps, service line sizing.
• Safety Devices: T&P relief valves (temperature & pressure), BFP (backflow preventer), thermal
expansion tanks, high-limit controls.
• WI License Law: Scope of Restricted Appliance (gas piping to appliances, no sanitary drainage),
supervision ratios, continuing education.
200 MULTIPLE CHOICE QUESTIONS
, Page 2 of 80
1. Under Wisconsin SPS 382, what is the minimum burial depth for a residential gas service line
(plastic) in a non-traffic area?
A) 12 inches
B) 18 inches
C) 24 inches
D) 36 inches
Answer: B) 18 inches
*Rationale: WI SPS 382.41 requires 18" cover for plastic gas lines in private non-traffic areas; 24" if
under a driveway.*
2. A restricted appliance plumber in Wisconsin may legally install which of the following?
A) Drain, waste, and vent piping
B) Gas piping from the meter to a boiler
C) Water service pipe inside a building
D) Sewer ejector pump
Answer: B) Gas piping from the meter to a boiler
Rationale: Restricted Appliance license limits work to gas piping and related appliance connections; no
sanitary drainage or water service.
3. What is the maximum allowable pressure drop for low-pressure gas systems (6-7” WC) from the
meter to the farthest appliance?
, Page 3 of 80
A) 0.1” WC
B) 0.3” WC
C) 0.5” WC
D) 1.0” WC
Answer: C) 0.5” WC
*Rationale: IFGC 402.4.2 allows 0.5" WC drop for low-pressure systems; high-pressure systems (over 14"
WC) allow 1 psi drop.*
4. A 50-gallon storage water heater requires a T&P relief valve set to open at:
A) 150 psi and 150°F
B) 150 psi and 210°F
C) 125 psi and 200°F
D) 100 psi and 180°F
Answer: B) 150 psi and 210°F
Rationale: ASME code for water heaters – T&P opens at 150 psi or 210°F, whichever occurs first, to
prevent explosion.
5. When using CSST (corrugated stainless steel tubing) inside a building in Wisconsin, what additional
protection is required?
A) Dielectric unions
B) Arc-resistant jacket or bonding
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C) Plastic coating only
D) Vapor barrier
Answer: B) Arc-resistant jacket or bonding
Rationale: WI adopted amendments require CSST to be bonded to the building’s grounding electrode
system to reduce lightning-induced puncture risk.
6. The minimum combustion air opening for a gas furnace located in a confined space (room <50
cu.ft./1000 Btu) using the indoor air method, with louvered grilles, must be:
*A) 1 sq.in./1000 Btu*
*B) 1 sq.in./2000 Btu*
*C) 1 sq.in./3000 Btu*
*D) 1 sq.in./4000 Btu*
*Answer: A) 1 sq.in./1000 Btu*
*Rationale: IFGC 304.5.1 – Two openings (upper/lower) each 1 sq.in./1000 Btu, but not less than
100 sq.in.*
7. A Category IV gas appliance (condensing) vent system must be:
A) Type B gas vent
B) Masonry chimney
*C) PVC, CPVC, or stainless steel (AL29-4C)*
D) Single-wall galvanized
