Nevada C-1D Plumbing Contractor Examination

Per the 2018 UPC Section 1213.3 allowed on the Nevada C-1D exam, a new low-pressure fuel-gas piping system (not welded, operating at not more than 14 inches water column) shall stand an air, carbon dioxide, or nitrogen test of not less than which pressure and time?

• A3 psi for 10 minutes
• B10 psi for not less than 15 minutes with no perceptible drop
• C60 psi for 30 minutes
• DWorking pressure only, held for 5 minutes

Per 2018 UPC Section 1213.3, welded fuel-gas piping, or piping that will carry gas at pressures in excess of 14 inches water column, shall be tested at not less than which of the following?

• A10 psi for 15 minutes
• B15 psi for 15 minutes
• C25 psi for 10 minutes
• D60 psi for not less than 30 minutes

Where a sediment trap is not built into a gas appliance, the 2018 UPC requires the sediment trap to be installed in which location?

• AUpstream of the appliance shutoff valve, as close to the meter as practical
• BDownstream of the appliance shutoff valve, as close to the appliance inlet as practical
• CIn the street-side service riser below the meter
• DOnly on propane systems; natural-gas appliances do not need sediment traps

Per the 2018 UPC, each gas appliance shall have a shutoff valve located in the same room as the appliance and within what maximum distance of the appliance?

• A3 feet
• B6 feet
• C10 feet
• D25 feet, if the valve is readily accessible

Per 2018 UPC Section 1211.2, CSST gas piping shall be bonded to the electrical service grounding electrode system with a copper bonding jumper not smaller than which size?

• A10 AWG copper
• B8 AWG copper
• C6 AWG copper
• D4 AWG aluminum only

Per the 2018 UPC, underground fuel-gas piping shall have a minimum cover of 12 inches, increased to 18 inches where external damage is likely. If 12 inches of cover cannot be provided, which installation is acceptable?

• ALeave the pipe at 6 inches of cover if it is polyethylene
• BInstall the pipe in a conduit or bridge (shield) it
• CWrap steel pipe with duct tape and bury at 8 inches
• DReduce cover to 6 inches if a tracer wire is provided

A listed gas appliance connector used under the 2018 UPC shall not exceed what maximum length?

• A3 feet
• B6 feet
• C10 feet
• DThere is no length limit if the connector is listed

Polyethylene (PE) fuel-gas piping under the 2018 UPC is limited to which application, and what locating method is required?

• AIndoor exposed piping only, with no tracer
• BUnderground outdoor use, with an electrically continuous corrosion-resistant tracer wire…
• CConcealed indoor wall cavities if sleeved
• DAppliance connectors inside the mechanical room

A CSST bonding jumper under 2018 UPC 1211.2 shall connect to metallic gas piping or a fitting in which location?

• AOn the utility side of the meter, ahead of the point of delivery
• BBetween the point of delivery and the first downstream CSST fitting
• COnly at the last appliance shutoff valve on the system
• DTo the nearest cold-water pipe, which then serves as the electrode

Using the 2018 UPC longest-length method, a branch takeoff 25 feet from the meter on a system whose most remote appliance is 90 feet from the meter is sized from which table column?

• AThe 25-foot column, because that is the branch length
• BThe 50-foot column, averaging the two lengths
• CThe 90-foot column, because the entire system is sized from the longest run
• DThe 10-foot column, because the branch is short

Per 2018 UPC Section 707.4, each horizontal drainage pipe shall have a cleanout at its upper terminal, and additional cleanouts shall be provided for each how many feet of developed length?

• A50 feet or fraction thereof
• B75 feet or fraction thereof
• C100 feet or fraction thereof
• D200 feet if the pipe is 4 inches or larger

Per 2018 UPC 707.4, an additional cleanout is required in a drainage line for each aggregate horizontal change of direction exceeding how many degrees?

• A45 degrees
• B90 degrees
• C135 degrees
• D180 degrees

Per 2018 UPC 707.4, a cleanout shall be installed in which location relative to each urinal?

• AOnly at the building drain if the urinal is within 25 feet of a stack
• BAbove the fixture-connection fitting serving the urinal, regardless of where the urinal s…
• CIn the floor immediately in front of the urinal lip
• DUrinals never require their own cleanouts under the UPC

Per the 2018 UPC, a cleanout serving 3-inch drainage piping shall be which size, and a cleanout serving 6-inch drainage piping shall be not less than which size?

• A2 inches and 2 inches
• B3 inches and 4 inches
• C3 inches and 6 inches
• D4 inches and 6 inches

Per 2018 UPC 707.9, what minimum clear space is required in front of a cleanout on piping that exceeds 2 inches, and which horizontal run is exempt from an upper-terminal cleanout under 707.4 Exception?

• A12 inches by 12 inches; any run shorter than 25 feet
• B18 inches by 18 inches; water-closet branches of any length
• C24 inches by 24 inches; a horizontal drain less than 5 feet long that does not serve a si…
• D36 inches by 36 inches; stacks only

Per 2018 UPC Section 402.5, the centerline of a water closet shall be not less than which distance from a side wall, and not less than which distance center-to-center from an adjacent water closet?

• A12 inches from the wall and 24 inches center-to-center
• B15 inches from the wall and 30 inches center-to-center
• C18 inches from the wall and 36 inches center-to-center
• D21 inches from the wall and 42 inches center-to-center

Per 2018 UPC Section 408.6, a shower compartment shall have not less than which interior floor area and which minimum interior dimension?

• A900 square inches and 24 inches
• B1,024 square inches and 30 inches
• C1,296 square inches and 36 inches
• D1,600 square inches and 40 inches

Per 2018 UPC Section 407.3, the maximum hot-water temperature supplied to a public lavatory is limited to which value?

• A105 degrees F
• B110 degrees F
• C120 degrees F
• D140 degrees F

Per the 2018 UPC, a shower or tub-shower combination shall be equipped with a listed compensating-type mixing valve and the mixed-water outlet temperature shall not exceed which value?

• A115 degrees F without a listed valve if the water heater is set to 120 degrees F
• B120 degrees F at a listed ASSE 1016, 1069, or 1070 device as applicable
• C130 degrees F if a pressure-balancing valve is used
• D140 degrees F if a warning sign is posted

The Nevada C-1D plumbing classification, as described on PSI bulletin 270, includes hydronic heating not exceeding which input?

• A100,000 Btu/h
• B200,000 Btu/h
• C400,000 Btu/h
• DUnlimited hydronic input if the loop is closed

Makeup water serving a closed hydronic heating boiler shall be protected from backflow under the 2018 UPC by which method?

• AA hose-bibb vacuum breaker on the boiler drain
• BAn air gap or a reduced-pressure-principle backflow preventer
• CA dual-check valve under the sink in the same room
• DNo protection is required if the boiler pressure is less than city pressure

A closed hydronic heating loop that has no room to accept thermally expanded water requires which device on the system?

• AA sewage ejector
• BAn expansion tank sized for the loop volume and temperature rise
• CA grease interceptor
• DA Type B gas vent

A C-1D hydronic circulator delivers 8 gallons per minute through a closed loop with a 25 degree F temperature drop. What is the approximate heat delivery, and is the plant inside the C-1D 200,000 Btu/h cap?

• A10,000 Btu/h, inside the cap
• B50,000 Btu/h, inside the cap
• C100,000 Btu/h, inside the cap
• D400,000 Btu/h, outside the cap

Per the 2018 UPC, a storage-type potable water heater shall be provided with which relief device?

• AA temperature-and-pressure relief valve only if the tank exceeds 80 gallons
• BA combination temperature-and-pressure relief valve, or separate temperature and pressure…
• CA boiler-only ASME safety valve with no temperature element
• DNo relief valve if the water heater is electric

Per 2018 UPC Section 608.5, the discharge pipe from a water-heater temperature-and-pressure relief valve shall comply with which installation?

• AIt may be reduced one size, trapped, and terminated with a threaded cap
• BIt shall be full size, not trapped, have no valve, have no end threads, and terminate thr…
• CIt shall be pumped to the roof overflow drain
• DIt shall connect directly to the sanitary building drain with a sanitary tee

Per the 2018 UPC, a gas-fired water heater installed in a residential garage, unless it is listed as flammable-vapor-ignition-resistant, shall have its ignition source elevated not less than how far above the garage floor?

• A6 inches
• B12 inches
• C18 inches
• D36 inches

A storage water heater is installed on a potable system that already has a backflow preventer or a check valve at the service. Per the 2018 UPC, what additional device is required because the system is now closed?

• AA grease interceptor on the T&P discharge
• BA thermal-expansion tank or other listed expansion-control device
• CA sewage ejector
• DA second T&P valve in series

For a natural-draft Category I gas water heater, which vent-clearance pair matches common 2018 UPC / manufacturer practice tested on contractor exams?

• AType B double-wall vent 1 inch to combustibles; single-wall metal connector 6 inches to c…
• BType B vent 6 inches; single-wall connector 1 inch
• CPVC Schedule 40 for any Category I draft-hood heater, 0 inches to combustibles
• DSingle-wall vent through the roof with 0 inches of clearance if painted

In seismic design categories that require water-heater strapping under the 2018 UPC, a storage water heater shall be anchored to resist overturning with straps located how?

• AOne strap only, around the drain valve
• BStraps at the upper and lower thirds of the tank, with the lower strap at least 4 inches…
• CA single strap at the very top nipple
• DNo straps if the heater sits on a stand

A storage water heater installed in an attic or above a finished ceiling requires a drip pan under the 2018 UPC. The pan drain shall be not less than which size when the T&P does not discharge into the pan?

• A1/2 inch, piped into the T&P discharge
• B3/4 inch, piped indirectly to an approved location
• C2 inches, connected to the building sewer with a sanitary tee
• DNo drain is required if the pan is watertight

A bottom-fed storage water heater (cold water entering the bottom) requires which additional protection under the 2018 UPC, and the T&P valve shall be rated how relative to the tank?

• AA vacuum relief valve; T&P pressure rating not exceeding the tank working pressure and Bt…
• BA grease interceptor; T&P set at twice the tank pressure
• CA backwater valve; T&P rated for half the heater input
• DNo vacuum protection; any 150 psi valve regardless of tank listing

Per the 2018 UPC, the building water-service pipe shall be provided with a fullway (full-open) valve in which location?

• AOnly at each individual fixture
• BOn the discharge side of the water meter, or where the service enters the building if the…
• COnly on the hot-water recirculation return
• DValves are prohibited on the water service

Where copper water tube is joined to galvanized steel water pipe, the 2018 UPC requires which fitting to control galvanic corrosion?

• AA sanitary tee laid on its back
• BA dielectric union or other listed dielectric fitting
• CA brass cleanout plug
• DA rubber no-hub coupling

Per 2018 UPC Section 608.2, where static water pressure exceeds 80 psi, what shall be installed?

• AA booster pump to raise pressure further
• BAn approved pressure regulator preceded by an adequate strainer, reducing static pressure…
• CA vacuum breaker at the meter
• DNothing; 100 psi is the UPC maximum

Per the 2018 UPC, unions or an equivalent means of disconnection shall be provided in which location relative to water-heating and similar equipment?

• AUnions are prohibited on potable water
• BWithin 12 inches of each water heater and as required so the appliance can be removed wit…
• COnly on the gas line, never on the water line
• DOnly on piping larger than 2 inches

Per 2018 UPC Section 609.10, water-hammer arrestors shall be installed where?

• AOnly on fire-sprinkler mains
• BOn water-supply piping to fixtures or equipment that uses quick-acting valves, sized and…
• COn every trap arm
• DOnly if the static pressure is less than 40 psi

A building supply is reduced from 110 psi static to 70 psi by a pressure regulator. When sizing the water-distribution piping from 2018 UPC Table 610.4, which pressure shall be used?

• A110 psi, the street static pressure
• B80 psi, the code maximum, unadjusted
• C56 psi, which is 80 percent of the 70 psi reduced pressure
• D15 psi, the minimum residual at the fixture

Per 2018 UPC Section 608.2, the maximum static water pressure in a potable building supply, after any required regulator, shall not exceed which value?

• A40 psi
• B60 psi
• C80 psi
• D150 psi

Per the 2018 UPC water-supply sizing rules, the residual water pressure at the most remote fixture, during peak demand, shall be not less than which value (except as otherwise required for flushometers)?

• A5 psi
• B8 psi
• C15 psi
• D40 psi

Per the 2018 UPC, the minimum size of a water-service pipe serving a building is generally not less than which diameter?

• A3/8 inch
• B1/2 inch
• C3/4 inch
• D2 inches

Per 2018 UPC Section 609.1, underground water piping shall be installed below the frost line and not less than how far below finished grade?

• A6 inches
• B12 inches
• C24 inches in every climate
• D48 inches in every climate

Per 2018 UPC Section 720.0, a water-service pipe may share a trench with a building sewer of clay or other material not approved inside a building only when which conditions are both met?

• AThe water pipe is any distance below the sewer
• BThe bottom of the water pipe is at least 12 inches above the top of the sewer, and the wa…
• CThe pipes are tied together every 4 feet
• DA single 2 inch sand cushion is placed between them, water below the sewer

Per 2018 UPC Table 610.3, the water-supply fixture-unit value for a private 1.6 gpf gravity-tank water closet is which of the following?

• A1.0 WSFU
• B2.5 WSFU
• C5.0 WSFU
• D10.0 WSFU

Per 2018 UPC Table 610.3, a private lavatory is which water-supply fixture-unit value, and a private kitchen sink is which value?

• ALavatory 0.5 WSFU and kitchen sink 0.5 WSFU
• BLavatory 1.0 WSFU and kitchen sink 1.5 WSFU
• CLavatory 2.0 WSFU and kitchen sink 4.0 WSFU
• DLavatory 4.0 WSFU and kitchen sink 2.5 WSFU

Potable-water pipe, fittings, and fixtures installed under the 2018 UPC shall be lead-free, meaning a weighted-average lead content not exceeding which amount?

• A8.0 percent
• B0.25 percent
• C2.0 percent
• DLead content is unregulated if the pipe is painted

A private dwelling has two 1.6 gpf tank water closets (2.5 WSFU each), two lavatories (1.0 each), one bathtub (4.0), one shower (2.0), one kitchen sink (1.5), one dishwasher (1.5), one clothes washer (4.0), and one hose bibb (2.5). What total WSFU is used to enter Table 610.4?

• A12.0 WSFU
• B18.5 WSFU
• C22.5 WSFU
• D31.5 WSFU

A water service of copper tube crosses a clay building sewer. In addition to the 12 inch vertical-separation rule of UPC 720.0, which joint-and-material practice is required?

• AInstall as many water joints as possible directly over the sewer crossing
• BKeep the number of water-pipe joints to a minimum and maintain the water pipe not less th…
• CChange the water pipe to unlisted rubber hose at the crossing
• DSleeve the sewer in cardboard and rest the water pipe on it