IPC Quiz Questions and Complete Solutions Graded A+

IPC Quiz Questions and Complete Solutions Graded A+ Plumbing products and materials required to comply with a referenced standard shall be listed by a__-__ __ __as complying with the referenced standards. - Answer: third-party certification agency Products and materials shall be identified in accordance with Section 303.1. Where sheathing is used to prevent direct contact between copper piping and concrete walls and floors, the sheathing shall be plastic and have a thickness of not less than ____inch. - Answer: 0.008 (8 mil) Where sheathing protects piping that penetrates concrete or masonry walls or floors, the sheathing shall be installed in a manner that allows movement of the piping within the sheathing. Sleeves for pipes that pass through a foundation wall shall be ____ pipe sizes greater than the pipe passing through the wall. - Answer: Two (2) Exterior water supply system piping shall be installed not less than _____inches below the frost line and not less than _____inches below grade. - Answer: 6. 12 2018 IPC Section 305.4 Freezing In concealed locations where piping is installed through holes or notches in studs, joists or rafters less than ___ inches from the nearest edge of the member, the pipe shall be protected by steel shield plates. - Answer: 1 1/4 " Other than cast-iron or galvanized steel piping. 2018 IPC Section 305.6 Protection against physical damage. Buried piping shall be ____ throughout its entire length. - Answer: supported Trenching installed parallel to footings and walls shall not extend into the ____ ____ of a footing or wall. - Answer: bearing plane The upper boundary of the bearing plane is a line that extends downward, at an angle of 45 degrees from horizontal, from the outside bottom edge of the footing or wall. 2018 IPC Section 307.5 Protection of footings. The maximum horizontal spacing to support copper or copper-alloy pipe is ___ feet. - Answer: 12 feet Review and know how to use this table Table 308.5 hanger spacing Trenching installled parallel to footings and walls shall not extend into the ___ ___ of a footing or wall - Answer: bearing plane The upper boundary of the bearing plane is a line that extends downward, at an angle of 45 degrees from horizontal, from the outside bottom edge of the footing or wall. Section 307.5 Protection of footings. For horizontal pipes, rigid support sway bracing shall be provided at changes in direction greater than 45 degrees for pipe sizes ____ inches and larger. - Answer: 4 inches For pipe sizes greater than ____ inches, restraints shall be provided for drain pipes at all changes in direction and at all changes in diameter greater than two pipe sizes. - Answer: 4 inches Braces, blocks, rodding and other suitable methods as specified by the coupling manufacturer shall be utilized. 2018 IPC Section 308.7.1 Location. In a parallel water distribution system where hot water piping is bundled with cold or hot water piping, each hot water pipe shall be ____. - Answer: Insulated A thermal expansion tank shall be _____ in accordance with the manufacturer's instructions. - Answer: Supported Plumbing system piping shall be tested with either _____ or, for piping systems other than plastic, by _____. - Answer: Water or air When doing a drainage and vent water test, the water shall be kept in the system, or portion under test, for at least _____ minutes. - Answer: 15 minutes An air test on a drainage and vent system requires a minimum uniform gauge pressure of _____ , ____ psi. This pressure shall be held for a test period of not less than _____ minutes. - Answer: 5, 15 Plastic piping shall not be tested using air. 2018 IPC Section 312.3 Drainage and The final test of the completed drainage and vent system shall be ____ and in sufficient detail to determine compliance with the provisions of this code. - Answer: Visual Upon completion of a section of or the entire water supply system, the system, or portion completed, shall be tested and proved tight under a water pressure not less than the of the ______ _____ system. - Answer: working pressure Or, for piping systems other than plastic, by an of not less than 50 psi. 312.5 Water supply system test. Annual inspections shall be made of all _______ prevention assemblies and air gaps to determine whether they are operable. - Answer: Backflow The minimum size condensate drainage line pipe diameter for refrigeration units over 20 tons but less than 35 tons shall be inch. - Answer: 1 inch 314.2.2 condensate dran sizing Restaurants shall have a minimum of 1 lavatory for each _____ persons. - Answer: 200 persons Review and know how to use this table. 2018 IPC Table 403.1 Minimum Number of Required Plumbing Fixtures. How do determine the occupant you load for each sex when calculating how many plumbing fixtures are required? - Answer: Divide the total occupant load in half. Review the exception based on approved statistical data in this section. 2018 IPC Section 403.1.1 Fixture calculations. Separate toilet facilities are not required in structures or tenant spaces with a total occupant load of ____ or fewer. - Answer: 15 or fewer Separate facilities shall not be required in mercantile occupancies in which the maximum occupant load is 100 and business occupancies in which the maximum occupant load is 25. 2018 IPC Section 403.2 Separate facilities, Exceptions 2, 3 and 4. Where separate toilet facilities are required for each sex and each toilet facility is required to have only one water closet, two or ____, _____ - _____ toilet facilities shall be permitted to serve as the required separate facilities. - Answer: family assisted-use In what occupancies do you need to provide toilet facilities employees? - Answer: All occupancies Public toilet facilities shall not be required in structures and tenant spaces intended for, ____ transactions having a public access area less than or equal to ____ square feet. - Answer: Quick 300 square feet Drinking fountains shall not be required to be located in individual tenant spaces provided that public drinking fountains are located within a travel distance of ____ feet of the most remote location in the tenant space. - Answer: 500 ft The length of a pipeline measured along the centerline of the pipe and fittings. - Answer: Developed Length A measure of the probable discharge into the drainage system by various types of plumbing fixtures. - Answer: Drainage Fixture Unit (dfu) Water closet compartments shall be not less than _____ inches in width and not less than _____ inches in depth for floor-mounted water closets. - Answer: 30" 60" _____ shall not be required for on- site nonpotable water reuse for subsurface landscape irrigation systems. - Answer: Disinfection Downspouts and leaders of a nonpotable rainwater collection system shall be equipped with a_____ _____ or equivalent device to prevent leaves, sticks, pine needles and similar material from entering the system. - Answer: Debris excluder Gray water used for flushing water closets and urinals shall be ____ - Answer: disinfected And shall be treated by an on-site water reuse treatment system complying with NSF 350. flushing. For a subsurface landscape irrigation system, the permeability of the soil in the proposed absorption system shall be determined by ____ tests or permeability evaluation. - Answer: Percolation Distribution piping in a subsurface landscape irrigation system shall be not less than _____ inches in diameter and the top of the pipe shall be not less than ______ inches below the original surface. - Answer: 3" 8" The of this code is to establish purpose standards to provide a reasonable level of safety, health, property protection and public welfare. - Answer: Minimum Where, in any specific case, different sections of this code specify different materials, methods of construction or other requirements, the most _____ shall govern. - Answer: Restrictive Minor plumbing repairs may be done in the same manner and arrangement as was in the existing system as long as it is not hazardous and is _____. - Answer: Approved Where the extent of a referenced standard includes subject matter that is within the of the IPC, the scope provisions of _____ _____ shall take precedence over the provisions in the referenced standard. - Answer: The IPC Where there are practical difficulties involved in carrying out the provisions of this code, the code official shall have the authority to grant ____ for individual cases. - Answer: Modifcations Where the code official finds that a proposed alternative material does not comply with the intent of the code provisions, the code official shall respond______ _______ , stating the _____ _____ _____. - Answer: In writing Reason for disapproval How many extensions of 180 days may a code official grant on an application for a permit? - Answer: One or more Notice issued permit can only be extended once per Section 106.5.4. Section 106.3.3 Time limitation of application. No permit presuming to give authority to violate or cancel the provisions of this code shall be ____. - Answer: Valid Underground inspection shall be made after trenches or ditches are excavated and bedded, piping installed, and before any ______ is put in place. - Answer: Backfill Rough-in inspection shall be made after the roof, framing, fireblocking, firestopping, draftstopping and bracing is in place and all sanitary, storm and water distribution piping is roughed-in, and prior to the installation of ______ or _____ membranes. - Answer: Wall Ceiling Final inspection shall be made after the building is complete, all plumbing fixtures are in place and properly connected, and the structure is ready for ______ - Answer: Occupancy The code official shall have the authority to authorize ______ of utility service to the building, structure or system regulated by the technical codes in case of where emergency, necessary, to eliminate an immediate danger to life or property. - Answer: Disconnection Any part of the piping system except a riser, main or stack. - Answer: Branch That part of the lowest piping of a drainage system that receives the discharge from soil, waste and other drainage pipes inside and that extends 30 inches beyond the exterior walls of the building and the drainage conveys to the building sewer. - Answer: Building Drain An access opening in the drainage system utilized for the removal of obstructions. - Answer: Cleanout A specially designed system of waste piping embodying the horizontal wet venting of one or more sinks, lavatories, drinking fountains or floor drains by means of a common waste and vent pipe adequately sized to provide free movement of air above the flow line of the drain. - Answer: Combination Waste and Vent System A specially designed system of waste piping embodying the horizontal wet venting of one or more sinks, lavatories, drinking fountains or floor drains by means of a common waste and vent pipe adequately sized to provide free movement of air above the flow line of the drain. - Answer: Combination Waste and Vent System The unobstructed vertical distance through the free atmosphere between the outlet of the waste pipe and the flood level rim of the receptacle into which the waste pipe is discharging. - Answer: Air Gap (Drainage System) A group of fixtures consisting of a water closet, lavatory, bathtub or shower, including or excluding a bidet, floor drain or both. an emergency - Answer: Bathroom Group Such fixtures are located together on the same floor level. A backflow prevention assembly, a backflow prevention device or other means or method to prevent backflow into the potable water supply. - Answer: Backflow Preventer A receptacle designed to collect surface or storm water from an open area. - Answer: Area Drain One-way valve designed to allow air to enter the plumbing drainage system when negative pressures develop in the piping system. - Answer: Air Admittance Valve An elevation (height) reference point that determines the minimum height at which a backflow preventer or vacuum breaker is installed above the flood level rim of the fixture or receptor served by the device. - Answer: Critical Level A type of backflow preventer installed on openings subject to normal that atmospheric pressure prevents backflow by admitting atmospheric pressure through ports to the discharge side of the device. - Answer: Vacuum Breaker A fitting or device that provides a liquid seal to prevent the emission of sewer gases without materially affecting the flow of sewage or waste water through the trap. - Answer: Trap Water having a temperature range between 85 f and 110f. - Answer: Tempered water A tank or pit that receives sewage or liquid waste, located below the normal grade of the gravity system and that must be emptied by mechanical means. - Answer: Sump The extension of a soil or waste stack above the highest horizontal drain connected to the stack. - Answer: Stack vent The fall (pitch) of a line of pipe in reference to a horizontal plane. - Answer: Slope Parts of the plumbing system that are installed prior to the installation of fixtures. - Answer: Rough- in That which enables a fixture, appliance or equipment to be directly reached without requiring the removal or movement of any panel, door or similar obstruction and without the use of a portable ladder, step stool or similar device. - Answer: Ready Access Know the difference between Ready (To). A valve or faucet that closes automatically when released manually or that is controlled by a mechanical means for fast-action closing. - Answer: Quick-closing valve Water free from impurities present in amounts sufficient to cause disease or harmful physiological effects and conforming to the bacteriological and chemical quality requirements of the Public Health Service Drinking Water Standards or the regulations of the public health authority having jurisdiction. - Answer: Potable Water Includes the water distribution pipes; plumbing fixtures and traps; water- treating or water-using equipment; soil, waste and vent pipes; and building drains; in addition to their respective connections, devices and appurtenances within a structure or premises. - Answer: Plumbing system A water system for the collection, treatment, storage, distribution and reuse of nonpotable water generated on site, including but not limited to a gray water system. - Answer: On-Site Nonpotable Water Reuse System This definition does not include a rainwater harvesting system. A combination of approved bends that makes two changes in direction bringing one section of the pipe out of line but into a line parallel with the other section. - Answer: Offset The for which building purpose or portion thereof is utilized or occupied. - Answer: Occupancy Water not safe for drinking, personal or culinary utilization. - Answer: Nonpotable Water The principal pipe artery to which branches are connected. - Answer: Main A device designed and installed to separate and retain for removal, by automatic or manual means, deleterious, hazardous or undesirable matter from normal wastes, while permitting normal sewage or wastes to discharge into the drainage system by gravity. - Answer: Interceptor A system for disposal of domestic sewage by means of a septic tank, cesspool or mechanical treatment, designed for utilization apart from a public sewer to serve a single establishment or building. - Answer: Individual Sewage Disposal System Water at a temperature greater than or equal to 110° F. - Answer: Hot Water Any pipe or fitting that makes an angle of less than 45 degrees with a horizontal plane. - Answer: Horizontal pipe A tank designed with a fill valve and flush valve to flush the contents of the bowl or usable portion of the fixture. - Answer: Flush tank A valve end of a water pipe through which water is drawn from or held within the pipe. - Answer: Faucet A vertical vent pipe installed primarily for the of providing circulation purpose of air to and from any part of the drainage system. - Answer: Vent Stack Know the difference between Vent Stack Vent. A floor sink, standpipe, hub drain or floor drain that receives the discharge of one or more indirect waste pipes. - Answer: Waste Receptor Any heating appliance or equipment that heats potable water and supplies such water to the potable hot water distribution system. - Answer: Water Heater Plumbing systems shall not be located in an shaft _____ or in an ____ equipment room. - Answer: Elevator shaft Elevator room Where the manufacturer's installation instructions do not conform to _____ provisions of this code, the provisions of this code shall apply. - Answer: Minimum For water service piping, cement or concrete joints shall be - Answer: prohibited Joints made with fittings not approved for the specific installation, solvent- cement joints between different types of plastic pipe and saddle-type fittings are also prohibited. Hot water distribution pipe and tubing shall have a pressure rating of not less than ______ psi at 180°F. - Answer: 100 psi Water service pipe or tubing, installed underground and outside of the structure, shall have a working pressure rating of not less than psi. - Answer: 160 psi Pipe, pipe fittings, joints, valves, faucets and fixture fittings supplying water for shall drinking or cooking purposes lead content have a weighted average of _______ percent or less. - Answer: 0.25 A water-hammer arrestor shall be installed where ________-______ valves are utilized. - Answer: Quick-closing Where water pressure within a building exceeds _______ psi static, an approved water pressure-reducing valve with a strainer shall be installed to reduce pressure to not greater than _______ psi static. - Answer: 80 psi 80 psi Lavatories shall have a minimum _____-inch water supply pipe. - Answer: 3/8 The maximum flow rate for a water closet is ______ gallons per flushing cycle. - Answer: 1.6 The required water design capacity of bathtub mixing valves is _______ gallons per minute. - Answer: 4 Water service pipe and the building sewer shall be horizontally separated by not less than _______ feet of undisturbed or compacted earth. - Answer: 5' Where potable water pumps are installed in basements, such pumps shall be mounted on a block or shelf not less than _______ inches above the basement floor. - Answer: 18" Water from an individual water supply shall be approved as ________ by the authority having jurisdiction prior to connection to the plumbing system. - Answer: Potable Unless otherwise provided in this code, ________ water shall be supplied to all plumbing fixtures. - Answer: Potable Existing metallic water service piping used for electrical grounding shall not be replaced with ___________ pipe or tubing until other approved means of grounding is provided. - Answer: Nonmetallic A for a water heater shall be not pan less than __________ inches in depth. - Answer: 1 1/2" The discharge piping serving a relief valve temperature and pressure shall be one nominal size larger than the size of the relief valve outlet where the discharge piping is installed with __________ fittings. - Answer: Insert The discharge piping serving a temperature and pressure relief valve of a water heater shall terminate not more than _______ inches above and not less than __________ times the discharge pipe diameter above the floor or flood level rim of the waste receptor. - Answer: 6" Two (2) The discharge piping serving a relief valve temperature and pressure of a water heater shall discharge to the _______, to the _____serving the water heater, to a ________ _______ or to the _______ - Answer: floor pan waste receptor outdoors A water heater shall have a level working space not less than _______ inches in length and ______ inches in width provided in front of the control side to service the appliance. - Answer: 30" 30" The temperature of water from tankless water heaters shall be a maximum of_____°F where intended for domestic uses. - Answer: 140 Water heaters shall be thred-party_______ - Answer: Certified Whirlpool bathtub shall be pumps located above the _______ of the fixture trap. - Answer: Weir Water closet bowls for public or employee toilet facilities shall be of the _____ type. - Answer: Elongated In each bathroom or toilet room, urinals shall not be substituted for more than ______ percent of the required water closets in assembly and educational occupancies. - Answer: 67 Sinks shall be provided with waste outlets a minimum of _______ inches in diameter. - Answer: 1 1/2 The wall area of showers and above built-in tubs with installed shower heads shall be constructed of smooth, corrosive-resistant and nonabsorbent waterproof materials to a height not less than _________ feet above the room floor level. - Answer: 6' All shower compartments shall be not less than _____ square inches in interior cross-sectional area with a least dimension not less than ________ inches. - Answer: 900 30 ________ water shall be delivered from lavatories and wash group fixtures located in public toilet facilities. - Answer: Temperd Food waste disposers shall be provided with a supply of cold water and protected against backflow by an _______ _______ - Answer: Air gap Domestic food waste disposers shall be connected to a drain of not less than ________ inches in diameter. - Answer: 1 1/2 The hot water supplied to bathtubs and whirlpool bathtubs shall be limited to a maximum temperature of _____ °F. - Answer: 120 Drinking fountains, water coolers and water dispensers shall not be installed in public _________ - Answer: Restroom Where drinking fountains are required in occupancies other than a restaurant, water dispensers shall be permitted to be substituted for not more than ______ percent of the required number of drinking fountains. - Answer: 50 The waste connection of a residential dishwasher is permitted to connect directly to a ______ _____ _____on the tailpiece of the kitchen sink or the dishwasher connection of a ____ _____ _____. - Answer: wye branch fitting food waste disposer The waste outlet and overflow outlet of a bathtub shall be connected to waste tubing or piping not less than ______ inches in diameter. - Answer: 1 1/2 Urinal partitions shall extend from the wall surface at each side of the urinal not less than ______ inches or to a point not less than ______ inches beyond the outermost front lip of the urinal, whichever is greater. - Answer: 18 6 Where the vent stack connects to the building drain, the connection shall be located downstream of the drainage stack and within a distance of ________ times the diameter of the drainage stack. - Answer: 10 Vent stacks or stack vents shall ______ outdoors to the open air or to a stack-type air admittance valve. - Answer: Terminate The vent system serving each ______ _____ shall have at least one vent pipe that extends to the outdoors. - Answer: Building drain Vent terminals shall not be within ______ feet horizontally of a building opening unless it is _______ feet or more above the top of such opening. - Answer: 10 3 Where vent extensions require frost closure protection, any increase in the size of the vent shall be made at least ______ foot inside the ______ ______ of the building. - Answer: 1 Thermal envelope Where a roof is to be used for assembly or as a promenade, observation deck, sunbathing deck or similar purposes, the open vent pipes shall terminate at least _______ feet above the roof. - Answer: 7 Standpipes shall extend not less than _______ inches but not greater than ________inches above the trap weir. - Answer: 18 42 A hub drain shall be in the form of a hub or a pipe extending not less than _______ inch above a water- impervious floor. - Answer: 1 The air between the indirect waste gap pipe and the flood level rim of the waste receptor shall be not less than _______ the effective opening of the indirect waste pipe. - Answer: Twice Indirect waste piping that exceeds 30 inches in developed length measured horizontally, or 54 inches in total developed length, shall be ______ - Answer: Trapped Floor drains located within walk-in refrigerators or freezers in food service and food establishments shall be ______connected to the sanitary drainage system by means of an air gap. - Answer: Indirectly A ______ _____is required to protect fixtures installed on a floor below the elevation of the next upstream manhole cover in the public sewer. - Answer: Blackwater valve Sump pits shall be not less than ________ inches in diameter and _______ inches in depth. - Answer: 18 24 The minimum trap size for unlisted fixtures shall be the size of the drainage outlet but not less than ________ inches. - Answer: 1 1/4 Cleanouts on 6-inch and smaller pipes shall be provided with a clearance of not less than _______inches. - Answer: 18 Cleanouts shall be the same size as the pipe they serve up to ______ inches. - Answer: 4 Where a horizontal drainage pipe, a building drain or a building sewer has a change of horizontal direction greater than _______ degrees, a cleanout shall be installed at the change of direction. - Answer: 45 Horizontal drainage pipes in buildings shall have cleanouts located not more than _______ feet apart. - Answer: 100 When used in the sanitary drainage system, joints between different diameter pipes made with elastomeric rolling O-rings are _______ - Answer: Prohibited A primer is not required for solvent- cemented joints of PVC drain, waste and vent pipe and fittings provided the installation is a nonpressure application and the pipe size does not exceed ________ inches in diameter. - Answer: 4 For galvanized steel pipe joints, pipe- joint compound or tape shall be applied on the _______ threads only. - Answer: Male The size of the drainage piping shall not be ________ in size in the direction of the flow. - Answer: Reduced Horizontal drainage pipe 2 1/2 inches or less shall slope a minimum of ______ inch per foot - Answer: 1/4 For potable water outlets with effective openings greater than 1 inch the gap minimum air close to a wall shall be ______ times the diameter of the effective opening. - Answer: Three (3) Backflow preventers shall not be located in areas subject to ______ - Answer: Freezing What color shall be used to identify piping in nonpotable water distribution systems? - Answer: Purple In employee and public toilet rooms, the required lavatory shall be located in the same _______ as the required water closet. - Answer: Room A floor drain that does not receive the discharge of any drain or indirect waste pipe, and that protects against damage from accidental spills, fixture overflows and leakage. - Answer: Emergency floor drain Urinal partitions shall begin at a height not greater than _______ inches from and extend not less than ______inches above the finished floor surface. - Answer: 12" 16" A permit for temporary equipment, systems and uses shall be limited as to time of service, but shall not be permitted for more than ______ days. - Answer: 180 Soldered joints of copper water supply piping shall be made with _____ ______ solders and fluxes. - Answer: Lead free Unless otherwise approved, on-site nonpotable water reuse systems shall collect waste discharge from only the following plumbing fixtures ______, ________ ________ ______: and ________ ______ - Answer: bathtubs, showers, lavatories, clothes washers and laundry trays Nonpotable water storage tanks shall be equipped with a(n) ______ pipe. - Answer: Overflow Unless covered by an exception, nonflammable medical gas systems, inhalation anesthetic systems and vacuum piping systems shall be designed and installed in accordance with _____________ - Answer: NFPA 99 Subsoil drains for storm water shall be open-jointed, horizontally split or perforated pipe, and shall be not less than ______ inches in diameter. - Answer: 4" Storm water shall not be drained into _______ intended for sewage only. - Answer: Sewers where floor or trench At repair garages drains are provided, __________ separators shall be installed into which oil-bearing, grease-bearing or flammable wastes shall be discharged before emptying into the building drainage system or other point of disposal. - Answer: Oil A _______ ______ _____ shall not discharge to a grease interceptor. - Answer: Food waste disposer Where a trap seal is subject to loss by evaporation, a trap seal ______ _____ or a trap seal protection device shall be installed. - Answer: Primer valve The vertical distance from the fixture outlet to the trap weir shall not exceed _______ inches. - Answer: 24" For vent systems utilizing air admittance valves, not less than _____ stack vent(s) or vent stack(s) within each plumbing system shall extend outdoors to the air. open - Answer: One Individual and branch-type air admittance valves shall be located a minimum of _______ inches above the horizontal branch drain or fixture drain being vented. - Answer: 4 Air admittance valves shall be installed a minimum of _______ inches above insulation materials. - Answer: 6" Island fixture venting shall not be permitted for fixtures other than ______ and _______ - Answer: Sinks and lavatories Combination waste and vent systems shall not receive the discharge of a or _____ ______ ______ clinical sink. - Answer: Food waste disposer A maximum of ______ fixtures connected to a horizontal branch drain shall be permitted to be circuit vented. - Answer: Eight Any combination of fixtures within ______ ______ _____located on the same floor level is permitted to be vented by a horizontal wet vent. - Answer: Two bathroom groups An individual vent is permitted to vent _______ traps or trapped fixtures as a _____ vent. - Answer: Two common A fixture vent shall not be installed within _______ pipe diameters of the trap weir. - Answer: Two Vent pipes shall not be less than inches in diameter. - Answer: 1 1/4 Every dry vent shall rise vertically to a minimum of ______ inches above the flood level rim of the highest trap or trapped fixture being vented. - Answer: 6" Nonpotable water outlets, such as hose ended pipes and connections, open faucets, shall be identified with signage that reads as follows: "Nonpotable water is utilized for [application name]. CAUTION: "_______ _______ - _________ _______ ________" - Answer: NONPOTABLE WATER- Do NOT DRINK A freezeproof yard hydrant that drains the riser into the ground is considered to have a _______ ______ ______ valve below grade. - Answer: Stop and waste The hot water supply to any fixture shall be installed on the ________ hand side of the fixture. - Answer: Left ______ valves shall be installed on the water supply pipe to each appliance or mechanical equipment. - Answer: Shutofff ________ open balves shall be installed on the water supply pipe to every water heater. - Answer: Full