SPS 382.40(4)(a)2.a.a. Except as provided in subd.
2. b., if a private water main connects to public water main, a curb stop shall be installed in the private water main between the corporation cock and the property line.
SPS 382.40(4)(a)2.b.
b. If a private water main 2-1/2" or larger in diameter connects to a public water main, one control valve may serve as the corporation cock and the curb stop. The control valve shall be located not more than 8 feet from the connection to the public water main and shall be accessible for operation.
SPS 382.40 Note
Note: See ch.
SPS 382 Appendix A-382.40 (4) for further explanatory material.
SPS 382.40(4)(b)
(b) Water services. Water services shall be provided with control valves as specified in this subsection.
SPS 382.40(4)(b)1.a.a. If a water service 2" or less in diameter connects to a public water main, a corporation cock shall be installed at the connection to the public water main.
SPS 382.40(4)(b)1.b.
b. If a water service 2-1/2" or larger in diameter connects to a public water main, a corporation cock shall be installed not more than 8 feet from the connection to the public water main.
SPS 382.40(4)(b)2.a.a. Except for water services serving farm buildings and farm houses, a curb stop shall be installed in each water service which connects to a private water main. The curb stop shall be located outside the building served by the water service.
SPS 382.40(4)(b)2.b.
b. Except as provided in subd.
2. c., a curb stop shall be installed in each water service which connects to a public water main. The curb stop shall be located between the corporation cock and the property line.
SPS 382.40(4)(b)2.c.
c. If a water service 2-1/2" or larger in diameter connects to a public water main, one control valve may serve as the corporation cock and the curb stop. The control valve shall be located not more than 8 feet from the connection to a public water main and shall be accessible for operation.
SPS 382.40(4)(b)3.
3. `Building control valves.' If a water service serves a building, a building control valve shall be provided in the water service as specified in this subsection.
SPS 382.40(4)(b)3.a.
a. If the water service connects to a public water supply or to a private water supply which has an external pressure tank, the building control valve shall be installed inside the building and located within 3 feet of developed length from the point where the water service first enters the building. If a water meter is provided, the building control valve shall be located upstream of the water meter.
SPS 382.40(4)(b)3.b.
b. If a private water supply includes an internal pressure tank, the building control valve shall be installed inside the building and located within 3 feet of developed length downstream from the internal pressure tank.
SPS 382.40 Note
Note: See ch.
SPS 382 Appendix for further explanatory material.
SPS 382.40(4)(c)1.1. Control valves shall be installed in water distribution systems serving public buildings as specified in this subdivision.
SPS 382.40(4)(c)1.a.
a. If a water meter is provided, a control valve shall be installed within 3 feet of developed length downstream from the outlet of the water meter. If bypass piping is provided around a water meter, a control valve shall be installed in the bypass piping.
SPS 382.40 Note
Note: See sub. (8) (d) 3. for the requirements relating to the bypassing of water meters.
SPS 382.40(4)(c)1.b.
b. A control valve shall be installed in the supply piping to each water heater and water treatment device and in the fixture supply to each plumbing fixture, plumbing appliance and piece of equipment. The control valve may be part of the bypass piping or an internal part of a water treatment device. When the valve is an internal part of the water treatment device, the device shall be removable for service.
SPS 382.40(4)(c)1.c.
c. If a hot water circulation system is provided, a control valve shall be installed on both the inlet and outlet piping to the circulation pump. If a hot water circulation system has 2 or more return pipe lines, a balancing control valve shall be installed in each return piping line.
SPS 382.40(4)(c)1.d.
d. The water distribution system for buildings with more than 4 dwelling units or living units shall be provided with control valves in such numbers and at such locations so that the water supplied to all the units within the building can be isolated into groups of 4 of less units.
SPS 382.40 Note
Note: See sub. (8) (g) for the valve requirements for water temperature control.
SPS 382.40(4)(c)2.
2. Control valves shall be installed in water distribution systems serving one- and 2-family dwellings as specified in this subdivision.
SPS 382.40(4)(c)2.a.
a. If a water meter is provided, a control valve shall be installed within 3 feet of developed length downstream from the outlet of the water meter. If bypass piping is provided around a water meter, a control valve shall be installed in the bypass piping.
SPS 382.40 Note
Note: See sub. (8) (d) 3. for the requirements relating to the bypassing of water meters.
SPS 382.40(4)(c)2.b.
b. A control valve shall be installed in the supply piping to each water heater and water treatment device and in the fixture supply to each water closet, exterior hose bibb, plumbing appliance and piece of equipment. When the valve is an internal part of the water treatment device, the device shall be removable for service.
SPS 382.40(4)(c)2.c.
c. If a hot water circulation system is provided, a control valve shall be installed on both the inlet and outlet piping to the circulation pump. If a hot water circulation system has 2 or more return pipe lines, a balancing control valve shall be installed in each return piping line.
SPS 382.40(5)(a)
(a) General. Water heating systems shall be sized to provide sufficient hot water to supply peak demand, except for a tankless type water heater that meets the requirements of par.
(am).
SPS 382.40(5)(am)
(am)
Tankless type water heaters. All tankless type water heaters shall have minimum flow rate as specified in this paragraph.
SPS 382.40(5)(am)1.
1. The minimum flow rate of a tankless type water heater may be obtained by multiplying 0.65 by the calculated hot water gallons per minute demand, as determined by Tables 382.40–1t and 382.40–3, provided the heater will achieve a water temperature of 110
°F at the terminal fitting or faucet.
SPS 382.40(5)(am)2.
2. The sizing method in subd.
1. may not be used for sizing a water heater serving a high-flow fixture, a hose bibb, a hydrant, or a fixture that is required to have a supply line with a diameter larger than 1/2 inch.
SPS 382.40(5)(am)3.
3. For the purposes of subd. 2, “high-flow fixture" means a fixture with a flow rate of more than 4 gallons per minute, at 80 pounds per square inch, and a water velocity not exceeding 8 feet per second.
SPS 382.40(5)(b)
(b) Temperature maintenance. Except as provided in par.
(bm), the developed length of hot water distribution piping from the source of the hot water supply to a plumbing fixture or appliance exceeds 100 feet, a circulation system or self-regulating electric heating cable shall be provided to maintain the temperature of the hot water within the distribution piping.
SPS 382.40(5)(b)1.
1. If a circulation system is used to maintain the temperature, no uncirculated hot water distribution piping may exceed 25 feet in developed length.
SPS 382.40(5)(b)2.
2. If a self-regulating electric heating cable is used to maintain the temperature, the cable shall extend to within 25 feet of each fixture or the appliance.
SPS 382.40(5)(b)3.
3. Water distribution piping conveying circulated water or served by a self-regulating electric heating cable shall be insulated to limit the heat loss at the external surface of the pipe insulation to a maximum of 25 BTUs per hour per square foot for aboveground piping and 35 BTUs per hour per square foot for underground piping. The maximum heat loss shall be determined at a temperature differential, T, equal to the maximum water temperature minus a design ambient temperature no higher than 65
°
F.
SPS 382.40(5)(b)4.
4. Water distribution piping served by self-regulating electric heating cable shall be identified as being electrically traced in accordance with ch.
SPS 316.
SPS 382.40(5)(b)5.
5. The installation of self-regulating electric heating cable may be subcontracted by a plumber to another trade.
SPS 382.40(5)(b)6.
6. All hot water circulation system connections shall be made downstream of the control valve serving the water heating device.
SPS 382.40(5)(b)7.
7. Hot water circulation piping and tubing may not exceed the maximum velocity requirements specified per the manufacturer.
SPS 382.40 Note
Note: See A-382.40 (5) for pipe insulation requirements.
SPS 382.40(5)(bm)
(bm)
Temperature maintenance; public buildings. Except as required in par.
(b) all public lavatories in public buildings shall comply with the provisions of sub.
(5) (b), except that allowable hot water supply distances for any fixture shall be calculated from the nearest source of hot water using the method in subd.
1. For public lavatories the allowable supply distance shall comply with the method in either subd. 1 or
2. of this section. In this section hot water sources shall include water heaters, circulating water systems, and self-regulating heat trace temperature maintenance systems.
SPS 382.40(5)(bm)1.
1. Maximum allowable pipe length method: Under this method the distance from a hot water supply to a fixture, public lavatory, or appliance may not exceed the distances in Table 382.40-1d. Fixture fittings, fixture supply connectors, and faucets may not be part of this calculation.
SPS 382.40(5)(bm)2.
2. Maximum allowable volume method: Under this method the maximum allowable volume of water between a hot water source and a public lavatory may not exceed 8 ounces. The allowable volume shall be the sum of the internal volume of all pipe, but may not include volume contained within fixture shutoff valves, within flexible water supply connectors to a fixture fitting, or within a fixture fitting. Pipe volume shall be calculated using the values in Table 382.40-1h.
SPS 382.40 Note
Note: Water heaters are to be installed in accordance with the requirements specified in chs.
SPS 361 to
366 and chs.
SPS 320 to
325 with respect to energy efficiency, enclosures and venting.
SPS 382.40(5)(d)
(d) Safety devices. Water heaters shall be equipped with safety devices as specified in this paragraph.
SPS 382.40(5)(d)1.
1. All pressurized storage-type water heaters and unfired hot water storage tanks shall be equipped with one or more combination temperature and pressure relief valves. The temperature steam rating of a combination temperature and pressure relief valve or valves shall equal or exceed the energy input rating in BTU per hour of the water heater. No shut off valve or other restricting device may be installed between the water heater or storage tank and the combination temperature and pressure relief valve.
SPS 382.40 Note
Note: The temperature steam rating of a combination temperature and pressure relief valve is commonly referred to as the AGA temperature steam rating.
SPS 382.40(5)(d)2.
2. All pressurized non-storage type water heaters shall be provided with a pressure relief valve installed at the hot water outlet with no shut off valve between the heater and the relief valve.
SPS 382.40(5)(d)3.
3. Temperature and pressure relief valves shall be installed so that the sensing element of the valve extends into the heater or tank and monitors the temperature in the top 6" of the heater or tank.
SPS 382.40(5)(d)4.
4. A vacuum relief valve shall be installed in each water heater and hot water storage tank which, when measured from the bottom of the heater or tank, is located more than 20 feet above any faucet or outlet served by the heater or tank.
SPS 382.40(5)(d)5.
5. Every relief valve which is designed to discharge water or steam shall be connected to a discharge pipe.
SPS 382.40(5)(d)5.b.
b. The discharge pipe and fittings shall have a diameter not less than the diameter of the relief valve outlet.
SPS 382.40(5)(d)5.e.
e. The discharge pipe shall be installed to drain by gravity flow to a floor served by a floor drain or to a receptor in accordance with s.
SPS 382.33 (8). The outlet of the discharge pipe shall terminate within 6" over the floor or receptor, but not less than a distance equal to twice the diameter of the outlet pipe. The outlet of the discharge pipe may not be threaded.
SPS 382.40(5)(d)5.f.
f. The discharge pipe for a water heater shall terminate within the same room or enclosure within which the water heater or hot water storage tank is located.
SPS 382.40(5)(e)1.1. All hot water supply systems shall be equipped with automatic temperature controls capable of adjustments from the lowest to the highest acceptable temperature settings for the intended use.
SPS 382.40(5)(e)2.
2. A separate means shall be provided to terminate the energy supplied to each water heater and each hot water circulation system.
SPS 382.40(6)(a)
(a) Intermittent flow fixtures. The load factor for intermittent flow fixtures on water supply piping shall be computed in terms of water supply fixture units as specified in Tables 382.40-1t and 382.40-2 for the corresponding fixture and use. Water supply fixture units may be converted to gallons per minute in accordance with Table 382.40-3 or 382.40-3e.
SPS 382.40(6)(b)
(b) Continuous flow devices. The load factor for equipment which demands a continuous flow of water shall be computed on the basis of anticipated flow rate in terms of gallons per minute.
a All nonpotable water outlets shall be identified at the point of use for each outlet with the following legends or as otherwise approved by the department.
b Tag should reflect the intended use.
SPS 382.40(6)(c)
(c)
Water heating sizing alternate approval. The load factor for an individual water heater serving an individual residence, apartment, living unit of a hotel or motel, and similar places where plumbing fixtures are intended for use by an individual or family, to the exclusion of all others, may be calculated as follows:
SPS 382.40(6)(c)1.
1. The minimum flow rate of a water heater may be obtained by multiplying the hot water demand calculated in accordance with Table 382.40-1b by a factor of 0.65.
SPS 382.40(6)(c)2.
2. The flow rate for a storage tank type water heater may be calculated based on a 70% usable storage plus the recovery rate and a 10 minimum draw time.
SPS 382.40(6)(c)3.
3. The flow rate for tankless type water heaters shall be based on a temperature increase that will provide 110
°F at the most remote terminus.
SPS 382.40(6)(c)4.
4. This alternate sizing method may not be applied to any of the following:
SPS 382.40(6)(c)4.a.
a. Water heaters serving high flow fixtures, hose bibs, hydrants or fixtures requiring 1/2 inch supply piping. High flow fixtures are fixtures with flow rates greater than 4 gpm at 80 psig and a water velocity less than or equal to 8 feet per second.
SPS 382.40 Note
Note: Values not specified in the table may be calculated by interpolation.
Table 382.40–3e
Conversion of Water Supply Fixture Units to Gallons
Per Minute for Water Treatment Devicesa Serving
an Individual Dwelling
b
- See PDF for table 
SPS 382.40(7)
(7)
Sizing of water supply piping. The sizing of the water supply system shall be based on the empirical method and limitations outlined in this subsection, an approved alternate standard per s.
SPS 381.20 (2), or an analysis provided by a Wisconsin registered architect, registered professional engineer or permitted designer of engineering systems – plumbing.
SPS 382.40 Note
Note: See appendix for details for alternative methods for sizing of the water supply piping of one- and 2-family and apartment buildings.
SPS 382.40(7)(a)
(a) Methodology. The determination of minimum pipe sizes shall take into account the pressure losses which occur throughout the entire water supply system and the flow velocities within the water distribution system. Calculations for sizing a water distribution system shall include:
SPS 382.40(7)(a)1.
1. The load factor in water supply fixture units or gallons per minute on the piping;
SPS 382.40(7)(a)2.
2. The minimum pressure available from the water main or pressure tank;
