Potable Water Systems Design PDF

Section 7.6. Potable Water Systems 7.6.1. Arrangement of Piping 7.6.1.1. Design **(1) **Every *fixture *supplied with separate hot and cold water controls shall have the hot water control on the left and the cold on the right. **(2) **Where hot and cold water are mixed and the temperature is reg...

Section 7.6. Potable Water Systems 7.6.1. Arrangement of Piping 7.6.1.1. Design **(1) **Every *fixture *supplied with separate hot and cold water controls shall have the hot water control on the left and the cold on the right. **(2) **Where hot and cold water are mixed and the temperature is regulated by a single, unmarked, manual control, a movement to the left shall increase the temperature and a movement to the right shall decrease the temperature. **(3) **In a hot *water distribution system *of a *developed length *of more than 30 m  or supplying more than 4 *storeys *, the water temperature shall be maintained by, \(a) recirculation, or \(b) a self-regulating heat tracing system. 7.6.1.2. Drainage **(1) **A *water distribution system *shall be installed so that the system can be drained or blown out with air and outlets for this purpose shall be provided. 7.6.1.3. Control and Shut-off Valves[A-7.6.1.3.(6) Identification of Underground Non-Metallic Pipe.](https://app.trax.co/browse/6c3e1f819b/1434f15d63?id=48bf1c57437c0e5c2d704fba41accf4c) **(1) **A *building control valve *shall be provided, \(a) on every *water service pipe *at the location where the *water service pipe *enters the *building *, or \(b) on the *water distribution system *at a location immediately downstream of the *point of entry treatment unit *, where the *building *is served by a *point of entry treatment unit *located in the *building *. **(2) **Except as provided in Sentence (3), a drain port shall be provided on the *water distribution system *immediately downstream of the *building control valve *required by Sentence (1) and if there is a meter, the drain port shall be installed immediately downstream of the meter on the *water distribution system *. **(3) **Where the *building control valve *required by Sentence (1) is of 1 in. trade *size *or smaller, the drain port may be an integral part of the *building control valve *in the form of a stop and waste valve and the drain port shall be located on the *water distribution system *side of the stop and waste valve. **(4) **Every pipe that is supplied with water from a tank on the property that is a gravity water tank or a tank of a *drinking water system *shall be provided with a shut-off valve located close to the tank. **(5) **Where the water supply is to be metered, the installation of the meter, including the piping that is part of the meter installation and the valving arrangement for the meter installation, shall be according to the *water purveyor 's *requirements. **(6) **For the purpose of identifying the pipe material where plastic water pipe is used underground for a service pipe, the end of the pipe inside the *building *shall be brought above ground for a distance not less than 300 mm  and not greater than 450 mm  . 7.6.1.4. Shut-off Valves **(1) **Except for a *house *containing not more than one *dwelling unit *, every *riser *shall be provided with a shut-off valve at the source of supply. 7.6.1.5. Water Closets **(1) **Every water closet shall be provided with a shut-off valve on its water supply pipe. 7.6.1.6. Suites[A-7.6.1.6.(1) Residential Suites.](https://app.trax.co/browse/6c3e1f819b/1434f15d63?id=6c70af3d4265e1b01c695de8778e6a5a) **(1) **Shut-off valves shall be installed in every *suite *in a *building *of *residential occupancy *as may be necessary to ensure that when the supply to one *suite *is shut off the supply to the remainder of the *building *is not interrupted. 7.6.1.7. Public Washrooms **(1) **The water supply to each *fixture *in a washroom for *public use *shall be individually valved and each valve shall be *accessible *. 7.6.1.8. Tanks **(1) **Every water pipe that supplies a hot water tank, pressure vessel, *plumbing appliance *or water using device shall be provided with a shut-off valve located close to the tank, pressure vessel, *plumbing appliance *or water using device. 7.6.1.9. Protection for Exterior Water Supply **(1) **Every pipe that passes through an exterior wall to supply water to the exterior of the *building *shall be provided with, \(a) a frost-proof hydrant with a separate shut-off valve located inside the *building *, or \(b) a stop-and-waste cock located inside the *building *and close to the wall. 7.6.1.10. Check Valves[A-7.6.1.10.(1) Check Valves.](https://app.trax.co/browse/6c3e1f819b/1434f15d63?id=f4d22c0b5c4b3b9216ce2bf8ca05df96) **(1) **A *check valve *shall be installed at the *building *end of the *water service pipe *where the pipe is made of plastic that is suitable for cold water use only. 7.6.1.11. Flushing Devices **(1) **Every flushing device that serves a water closet or one or more urinals shall have sufficient capacity and be adjusted to deliver at each operation a volume of water that will thoroughly flush the *fixture *or *fixtures *that it serves. **(2) **Where a manually operated flushing device is installed, it shall serve only one *fixture *. 7.6.1.12. Relief Valves[A-7.6.1.12. Relief Valves.](https://app.trax.co/browse/6c3e1f819b/1434f15d63?id=d8fb6da986a4f7b42a5096ba03ca55ac) **(1) **Every pressure vessel that is part of a *plumbing system *or connected to a *plumbing system *shall be equipped with a pressure relief valve designed to open when the water pressure in the tank reaches the rated working pressure of the tank, and so located that the pressure in the tank shall not exceed 1 100 kPa  or one-half the maximum test pressure sustained by the tank, whichever is the lesser. **(2) **Every hot water tank of a *storage-type service water heater *shall be equipped with a temperature relief valve with a temperature sensing element, \(a) located within the top 150 mm  of the tank, and \(b) designed to open and discharge sufficient water from the tank to keep the temperature of the water in the tank from exceeding 99°C  under all operating conditions. **(3) **A pressure relief valve and temperature relief valve may be combined where Sentences (1) and (2) are complied with. **(4) **Every *indirect service water heater *shall be equipped with, \(a) a pressure relief valve, and \(b) a temperature relief valve on every storage tank that forms part of the system. **(5) **Every pipe that conveys water from a temperature relief, pressure relief, or a combined temperature and pressure relief valve shall, \(a) be of a *size *at least equal to the *size *of the outlet of the valve, \(b) be rigid, slope downward from the valve, and, \(i) terminate with an indirect connection above a floor drain, sump or other safe location, with an *air break *of not more than 300 mm  , or \(ii) terminate at a distance not less than 150 mm  and not more than 300 mm  from a floor and discharge vertically down, \(c) have no thread at its outlet, and \(d) be capable of operating at a temperature of not less than 99°C  . **(6) **The temperature relief valve required in Clause (4)(b) shall, \(a) have a temperature sensing element located within the top 150 mm  of the tank, and \(b) be designed to open and discharge sufficient water to keep the temperature of the water in the tank from exceeding 99°C  under all operating conditions. **(7) **No shut-off valve shall be installed on the pipe between any tank and the relief valves or on the discharge lines from such relief valves. 7.6.1.13. Solar Domestic Hot Water Systems **(1) **Except as provided in Sentence (2), a system for solar heating of *potable *water shall be installed in accordance with good engineering practice. **(2) **Packaged systems for solar heating of *potable *water in *residential occupancies *shall be installed in conformance with CAN/CSA-F383, "Installation of Packaged Solar Domestic Hot Water Systems". 7.6.1.14. Water Hammer[A-7.6.1.14.(1) Water Hammer Prevention.](https://app.trax.co/browse/6c3e1f819b/1434f15d63?id=12a4a61863e21cd301eefe34968d405b) **(1) **Provision shall be made to protect the *water distribution system *from the adverse effects of water hammer. 7.6.1.15. Mobile Home Water Service **(1) **A *water service pipe *intended to serve a mobile home shall, \(a) be not less than ¾ in. in *size *, \(b) be terminated above ground, and \(c) be provided with, \(i) a tamperproof terminal connection that is capable of being repeatedly connected, disconnected and sealed, \(ii) a protective concrete pad, \(iii) a means to protect it from frost heave, and \(iv) a curb stop and a means of draining that part of the pipe located above the frost line when not in use. 7.6.1.16. Thermal Expansion[A-7.6.1.16.(1) Thermal Expansion.](https://app.trax.co/browse/6c3e1f819b/1434f15d63?id=c8675faf5e4eb8c3aeba2c10627d3976) **(1) **Protection against thermal expansion shall be required when a *check valve *is required by [Article 7.6.1.10. ](https://app.trax.co/browse/43c746629f/28cf3fed6f?id=OBCV1-DIVISION-B-PART-7-SECTION-7-6-1-_7-6-1-10-), a *backflow preventer *is required by [Article 7.6.2.2. ](https://app.trax.co/browse/43c746629f/28cf3fed6f?id=OBCV1-DIVISION-B-PART-7-SECTION-7-6-2-_7-6-2-2-), or a pressure reducing valve is required by [Article 7.6.3.3.](https://app.trax.co/browse/43c746629f/28cf3fed6f?id=OBCV1-DIVISION-B-PART-7-SECTION-7-6-3-_7-6-3-3-) 7.6.2. Protection from Contamination 7.6.2.1. Connection of Systems **(1) **Connections to *potable water systems *shall be designed and installed so that non- *potable *water or substances that may render the water non- *potable *cannot enter the system. **(2) **No connection shall be made between a *potable water system *supplied with water from a *drinking water system *and any other *potable water system *without the consent of the *water purveyor *. 7.6.2.2. Back-siphonage **(1) **Every *potable water system *that supplies a *fixture *or tank that is not subject to pressures above atmospheric shall be protected against *back-siphonage *by a *backflow preventer *. **(2) **Where a *potable *water supply is connected to a boiler, tank, cooling jacket, lawn sprinkler system or other device where a non- *potable *fluid may be under pressure that is above atmospheric or the water outlet may be submerged in the non- *potable *fluid, the water supply shall be protected against *backflow *by a *backflow preventer *. **(3) **Where a hose bibb is installed outside a *building *, inside a garage, or where there is an identifiable risk of contamination, the *potable water system *shall be protected against *backflow *by a *backflow preventer *. 7.6.2.3. Protection from Backflow **(1) **Except as provided in Sentence (3) and Articles [7.6.2.4. ](https://app.trax.co/browse/43c746629f/28cf3fed6f?id=OBCV1-DIVISION-B-PART-7-SECTION-7-6-2-_7-6-2-4-)to [7.6.2.6. ](https://app.trax.co/browse/43c746629f/28cf3fed6f?id=OBCV1-DIVISION-B-PART-7-SECTION-7-6-2-_7-6-2-6-), where a *backflow preventer *is required by this Subsection, the *backflow preventer *shall be selected, installed and tested in conformance with CSA B64.10, "Selection and Installation of Backflow Preventers". **(2) ***Backflow preventers *shall be provided in conformance with [Sentence 7.2.10.10.(1) ](https://app.trax.co/browse/43c746629f/28cf3fed6f?id=OBCV1-DIVISION-B-PART-7-SECTION-7-2-10-_7-2-10-10-). **(3) **Tank type water closet valves shall be provided with a *back-siphonage preventer *in conformance with [Sentence 7.2.10.10.(2) ](https://app.trax.co/browse/43c746629f/28cf3fed6f?id=OBCV1-DIVISION-B-PART-7-SECTION-7-2-10-_7-2-10-10-). 7.6.2.4. Backflow from Fire Protection Systems **(1) **A *backflow preventer *shall not be required in a *residential full flow through fire sprinkler system *, in which the pipe and fittings are constructed of *potable water system *materials. **(2) **Except as required in Sentence (4), *potable water system *connections to fire sprinkler and standpipe systems shall be protected against *backflow *caused by *back-siphonage *or *back pressure *in conformance with the following Clauses: (a) *Residential partial flow through fire sprinkler systems *in which the pipes and fittings are constructed of *potable water system *materials shall be protected by a dual *check valve backflow preventer *conforming to CSA B64.6.1, "Dual Check Valve Backflow Preventers for Fire Protection Systems (DuCF)", (b) *Class 1 fire sprinkler/standpipe systems *shall be protected by a single *check valve backflow preventer *conforming to CSA B64.9, "Single Check Valve Backflow Preventers for Fire Protection Systems (SCVAF)", provided that the systems do not use antifreeze or other additives of any kind and all pipes and fittings are constructed of *potable water system *materials, (c) *Class 1 fire sprinkler/standpipe systems *not covered by Clause (b) as well as *Class 2 *and *Class 3 fire sprinkler/standpipe systems *shall be protected by a double *check valve backflow preventer *conforming to CSA B64.5.1, "Double Check Valve Backflow Preventers for Fire Protection Systems (DCVAF)", provided that the systems do not use antifreeze or other additives of any kind, (d) *Class 1, Class 2 *or *Class 3 fire sprinkler/standpipe systems *, in which antifreeze or other additives are used, shall be protected by a reduced pressure principle *backflow preventer *conforming to CSA B64.4.1, "Reduced Pressure Principle Backflow Preventers for Fire Protection Systems (RPF)", installed on the portion of the system that uses the additives and the balance of the system shall be protected as required by Clause (b) or (c), (e) *Class 4 *and *Class 5 fire sprinkler/standpipe systems *shall be protected by a reduced pressure principle *backflow preventer *conforming to CSA B64.4.1, "Reduced Pressure Principle Backflow Preventers for Fire Protection Systems (RPF)", (f) *Class 6 fire sprinkler/standpipe systems *shall be protected, \(i) by a double *check valve backflow preventer *conforming to CSA B64.5.1, "Double Check Valve Backflow Preventers for Fire Protection Systems (DCVAF)", or \(ii) where a severe hazard may be caused by *backflow *, by a reduced pressure principle *backflow preventer *conforming to CSA B64.4.1, "Reduced Pressure Principle Backflow Preventers for Fire Protection Systems (RPF)", and (g) *backflow preventers *on fire sprinkler and standpipe systems shall be selected and installed in conformance with [Table 7.6.2.4.](https://app.trax.co/browse/43c746629f/28cf3fed6f?id=OBCV1-DIVISION-B-PART-7-SECTION-7-6-2-_7-6-2-4-) [Table 7.6.2.4.](https://app.trax.co/browse/43c746629f/28cf3fed6f?id=OBCV1-DIVISION-B-PART-7-SECTION-7-6-2-_7-6-2-4-)\ Backflow Preventers on Fire Sprinkler and Standpipe Systems Forming Part of [Sentence 7.6.2.4.(2)](https://app.trax.co/browse/43c746629f/28cf3fed6f?id=OBCV1-DIVISION-B-PART-7-SECTION-7-6-2-_7-6-2-4-) Item Column 1 Column 2 Column 3 Column 4 Column 5 Column 6 ------ --------------------- ---------------------- ------------------------------------------------------------ ----------------------------------------------------- --------------------------------------------------- -------------------------------------------------------------------------------------------- CSA Standard Number Type of Device ^(1)^ System Made with Potable Water System Materials System Not Made with Potable Water System Materials Minor Hazard ^(2) ^Residential Partial Flow-Through System Minor Hazard ^(2) ^Class 1 System Moderate Hazard ^(2) ^Class 1, 2, 3 and 6 Systems Severe Hazard ^(2) ^-- Any Class of System in which Antifreeze or Other Additives Are Used 1. B64.6.1 DuCF P NP NP NP 2. B64.9 SCVAF P P NP NP 3. B64.5.1 DCVAF P P P NP 4. B64.4.1 RPF P P P P : null null of Division B **Notes to [Table 7.6.2.4. ](https://app.trax.co/browse/43c746629f/28cf3fed6f?id=OBCV1-DIVISION-B-PART-7-SECTION-7-6-2-_7-6-2-4-):** **P -- Permitted** **NP -- Not Permitted** ^(1) ^The product is only permitted for use on fire sprinkler and standpipe systems. ^(2) ^Minor Hazard, Moderate Hazard and Severe Hazard have the same meaning as indicated in CSA B64.10 "Selection and Installation of Backflow Preventers". **(3) **The *backflow preventer *required by Sentence (2) shall be installed upstream of the fire department pumper connection. **(4) **Where a reduced pressure principle *backflow preventer *is required on the *water service pipe *at a service connection located on the same premises as the *fire service main *in *Class 3, 4, 5 *and *6 fire sprinkler/standpipe systems *, a reduced pressure principle *backflow preventer *conforming to CSA B64.4.1, "Reduced Pressure Principle Backflow Preventers for Fire Protection Systems (RPF)", shall also be provided on the fire service connection. 7.6.2.5. Backflow from Buildings with A Solar Domestic Hot Water System[A-7.6.2.5. Backflow from Buildings with a Solar Domestic Hot Water System.](https://app.trax.co/browse/6c3e1f819b/1434f15d63?id=f874b5fdcddd5f17a898bfedc0214afc) **(1) **Except as permitted by Sentence (2) and as provided in Sentences (3) and (4), a *potable water system *shall be protected against *backflow *where the heat transfer loop of a solar domestic hot water system is *directly connected *to the *potable water system *. **(2) **Where the heat transfer loop of the solar domestic hot water system consists of direct flow-through of *potable *water only, protection against *backflow *is not required. **(3) **A *potable water system *that is *directly connected *to the heat transfer loop of a solar domestic hot water system that serves a *residential occupancy *within the scope of Part 9 shall be provided with a *backflow preventer *selected in accordance with CAN/CSA-F379.1, "Packaged Solar Domestic Hot Water Systems (Liquid-to-Liquid Heat Transfer) for All-Season Use". **(4) **Where a solar domestic hot water system includes a single wall heat exchanger and contains only a relatively harmless heat transfer fluid as described in CAN/CSA-F379.1, "Packaged Solar Domestic Hot Water Systems (Liquid-to-Liquid Heat Transfer) for All-Season Use", the *backflow *prevention required in Sentence (1) is permitted to be a dual *check valve backflow preventer *conforming to CSA B64.3, "Dual Check Valve Backflow Preventers with Atmospheric Port (DCAP)". 7.6.2.6. Premise Isolation[A-7.6.2.6. Locations Requiring Premise Isolation.](https://app.trax.co/browse/6c3e1f819b/1434f15d63?id=57c1feb2b6255aa72357d8c2fa6a93c3) **(1) ***Buildings *or facilities where a moderate hazard or severe hazard may be caused by *backflow *shall be provided with premise isolation of the *potable water system *by the installation of a *backflow preventer *selected in accordance with Clauses 5.3.4.2.(b) and (c) of CSA B64.10, "Selection and Installation of Backflow Preventers". **(2) ***Buildings *of *residential occupancy *within the scope of Part 9 are not required to be isolated unless they have access to an *auxiliary water supply *. **(3) **Except as provided in Sentence (1), where no direct connection exists between the *auxiliary water supply *and the *potable water system *, premise isolation shall be provided by a dual *check valve backflow preventer *conforming to CSA B64.6, "Dual Check Valve (DuC) Backflow Preventers". 7.6.2.7. Reserved 7.6.2.8. Cleaning of Systems[A-7.6.2.8.(1) Flushing and Disinfecting Water Service Pipes.](https://app.trax.co/browse/6c3e1f819b/1434f15d63?id=83ad0028ef6afe7ab2a983414821d4b8) **(1) **A newly installed part of a *potable water system *shall be cleaned and then flushed with *potable *water before the system is put into operation. 7.6.2.9. Air Gap **(1) **An *air gap *shall not be located in a noxious environment. **(2) **Every *air gap *shall be not less than 25 mm  high and at least twice the diameter of the opening of the water supply outlet in height. 7.6.2.10. Vacuum Breakers and Flood Levels **(1) **Where the *critical level *is not marked on an atmospheric *vacuum breaker *, pressure *vacuum breaker *or spill-resistant pressure *vacuum breaker *, the *critical level *shall be taken as the lowest point on the device. **(2) **Where an atmospheric *vacuum breaker *is installed, it shall be located on the downstream side of the *fixture *control valve or faucet so that it will be subject to water supply pressure, \(a) only when the *fixture *control valve or faucet is open, and \(b) for periods of use not to exceed 12 h continuous. **(3) **An atmospheric *vacuum breaker *shall be installed so that the *critical level *is at least the distance specified by the manufacturer at which the device will operate safely but not less than 25 mm  above, \(a) the *flood level rim *of a *fixture *or tank, or \(b) the highest point open to atmosphere in an irrigation system. **(4) **A pressure *vacuum breaker *or spill-resistant pressure *vacuum breaker *shall be installed with its *critical level *at least 300 mm  above, \(a) the *flood level rim *of a *fixture *or tank, or \(b) the highest point open to atmosphere in an irrigation system. 7.6.3. Size and Capacity of Pipes 7.6.3.1. Design, Construction and Installation[A-7.6.3.1.(2) Design of Potable Water Systems.](https://app.trax.co/browse/6c3e1f819b/1434f15d63?id=be7915b09bb4eb7cd82fa6315354e17b) **(1) **Every *water distribution system *shall be designed to provide peak demand flow when the flow pressures at the supply openings conform to the plumbing supply fitting manufacturer's specifications. **(2) **A *potable water system *shall be designed, constructed and installed to conform to good engineering practice appropriate to the circumstances, such as that described in the ASHRAE Handbooks and ASPE Data Books. **(3) **Every pipe that supplies a *fixture *shall have a capacity that will produce a flow in the *fixture *that will flush the *fixture *and keep it in a sanitary condition. 7.6.3.2. Hydraulic Load **(1) **Except as provided in Sentence (3), the hydraulic load of a *fixture *or device that is listed in [Table 7.6.3.2.A. ](https://app.trax.co/browse/43c746629f/28cf3fed6f?id=OBCV1-DIVISION-B-PART-7-SECTION-7-6-3-_7-6-3-2-)shall be the number of *fixture units *given in the Table. **(2) **Except as provided in Sentences (1) and (3), the hydraulic load of a *fixture *that is not listed in [Table 7.6.3.2.A. ](https://app.trax.co/browse/43c746629f/28cf3fed6f?id=OBCV1-DIVISION-B-PART-7-SECTION-7-6-3-_7-6-3-2-)is the number of *fixture units *listed in [Table 7.6.3.2.D.](https://app.trax.co/browse/43c746629f/28cf3fed6f?id=OBCV1-DIVISION-B-PART-7-SECTION-7-6-3-_7-6-3-2-) **(3) **Where *fixtures *are supplied with both hot and cold water, the hydraulic loads for maximum separate demands shall be 75% of the hydraulic load of the *fixture units *given in Tables [7.6.3.2.A. ](https://app.trax.co/browse/43c746629f/28cf3fed6f?id=OBCV1-DIVISION-B-PART-7-SECTION-7-6-3-_7-6-3-2-)and [7.6.3.2.D. ](https://app.trax.co/browse/43c746629f/28cf3fed6f?id=OBCV1-DIVISION-B-PART-7-SECTION-7-6-3-_7-6-3-2-)when using a detailed engineering design method. **(4) **The hydraulic load of urinals and water closets with direct flush valves shall be the number of *fixture units *listed in Tables [7.6.3.2.B. ](https://app.trax.co/browse/43c746629f/28cf3fed6f?id=OBCV1-DIVISION-B-PART-7-SECTION-7-6-3-_7-6-3-2-)and [7.6.3.2.C.](https://app.trax.co/browse/43c746629f/28cf3fed6f?id=OBCV1-DIVISION-B-PART-7-SECTION-7-6-3-_7-6-3-2-) [Table 7.6.3.2.A.](https://app.trax.co/browse/43c746629f/28cf3fed6f?id=OBCV1-DIVISION-B-PART-7-SECTION-7-6-3-_7-6-3-2-)\ Sizing of Water Distribution Systems ^(1)(2)^ Forming Part of Sentences [7.6.3.2.(1) ](https://app.trax.co/browse/43c746629f/28cf3fed6f?id=OBCV1-DIVISION-B-PART-7-SECTION-7-6-3-_7-6-3-2-)to (3) and [7.6.3.4.(2) ](https://app.trax.co/browse/43c746629f/28cf3fed6f?id=OBCV1-DIVISION-B-PART-7-SECTION-7-6-3-_7-6-3-4-), (3) and (5) Item Column 1 Column 2 Column 3 Column 4 Column 5 Column 6 Column 7 Column 8 ------ --------------------------------------------------------- ------------------------------------ ----------------------------------------------- ---------------------------------------------- ---------- ---------- ---------- ---------- *Fixture *or Device Minimum *Size *of Supply Pipe, in. *Private Use *Hydraulic Load, *fixture units* *Public Use *Hydraulic Load, *fixture units* Cold Hot Total Cold Hot Total 1. Bathroom group with 6 LPF flush tank ^(3)^ N/A 2.7 1.5 3.6 \- \- \- 2. Bathroom group with greater than 6 LPF flush tank ^(3)^ N/A 4 3 6 \- \- \- 3. Bathroom group with more than 3 fixtures \- \- \- ^(4)^ \- \- \- 4. Bathtub with or without shower head 1/2 1 1 1.4 3 3 4 5. Bathtub with ¾ in. spout 3/4 7.5 7.5 10 7.5 7.5 10 6. Bedpan washer 1 \- \- \- 7.5 7.5 10 7. Bidet 3/8 1.5 1.5 2 \- \- \- 8. Clothes washer, 3.5 kg  1/2 1 1 1.4 2.25 2.25 3 9. Clothes washer, 6.8 kg  1/2 \- \- \- 3 3 4 10. Clothes washer, commercial ^(5)^ \- \- \- \- \- \- \- 11. Dental lavatory 3/8 \- \- \- 1.5 1.5 2 12. Dental unit, cuspidor 3/8 \- \- \- 1 \- 1 13. Dishwasher, commercial ^(5)^ \- \- \- \- \- \- \- 14. Dishwasher, domestic 3/8 \- 1.4 1.4 \- \- \- 15. Drinking fountain or water cooler 3/8 \- \- \- 0.25 \- 0.25 16. Hose bibb 1/2 2.5 \- 2.5 2.5 \- 2.5 17. Hose bibb 3/4 3 \- 3 6 \- 6 18. Hose bibb, combination hot and cold 1/2 1.9 1.9 2.5 1.9 1.9 2.5 19. Lavatory, 8.3 L  /min or less 3/8 0.5 0.5 0.7 1.5 1.5 2 20. Lavatory, greater than 8.3 L  /min 3/8 0.75 0.75 1 1.5 1.5 2 21. Shower head, 9.5 L  /min or less per head 1/2 1 1 1.4 3 3 4 22. Shower head, greater than 9.5 L  /min per head 1/2 1.5 1.5 2 3 3 4 23. Shower, spray, multi-head, *fixture unit *per head ^(5)^ 1 1 1.4 3 3 4 24. Sink, bar 3/8 0.75 0.75 1 1.5 1.5 2 25. Sink, clinic service faucet 1/2 \- \- \- 2.25 2.25 3 26. Sink, clinic service with direct flush valve 1 \- \- \- 6 \- 6 27. Sink, kitchen, commercial, per faucet 1/2 \- \- \- 3 3 4 28. Sink, kitchen, domestic, 8.3 L  /min or less 3/8 1 1 1.4 1 1 1.4 29. Sink, kitchen, domestic, greater than 8.3 L  /min 3/8 1.5 1.5 2 1.5 1.5 2 30. Sink, laboratory 3/8 \- \- \- 1.5 1.5 2 31. Sink, laundry (1 or 2 compartments) 3/8 1 1 1.4 1 1 1.4 32. Sink, service or mop basin 1/2 \- \- \- 2.25 2.25 3 33. Sink, washup, per faucet 1/2 \- \- \- 1.5 1.5 2 34. Urinal, with direct flush valve 3/4 ^(6)^ \- ^(6)^ ^(6)^ \- ^(6)^ 35. Urinal, with flush tank 3/8 3 \- 3 3 \- 3 36. Urinal, with self-closing metering valve 1/2 2 \- 2 4 \- 4 37. Water closet, 6 LPF or less with flush tank 3/8 2.2 \- 2.2 2.2 \- 2.2 38. Water closet, greater than 6 LPF with flush tank 3/8 3 \- 3 5 \- 5 39. Water closet, with direct flush valve 1 ^(6)^ \- ^(6)^ ^(6)^ \- ^(6)^ : null null of Division B **Notes to [Table 7.6.3.2.A.:](https://app.trax.co/browse/43c746629f/28cf3fed6f?id=OBCV1-DIVISION-B-PART-7-SECTION-7-6-3-_7-6-3-2-)** ^(1) ^The *fixture unit *values in this Table are not applicable in certain *assembly occupancies *because of surges in use by the occupants. For such *occupancies *, refer to specific design information. ^(2) ^For *fixtures *not indicated in this Table, refer to [Table 7.6.3.2.D.](https://app.trax.co/browse/43c746629f/28cf3fed6f?id=OBCV1-DIVISION-B-PART-7-SECTION-7-6-3-_7-6-3-2-) ^(3) ^*Bathroom group *is based on a ½ in. *size *bathtub supply pipe. ^(4) ^Add additional *fixture *to the *fixture *load for *bathroom group *. ^(5) ^Refer to the manufacturer's recommendations. ^(6) ^For *fixture unit *values for *fixtures *with direct flush valves, see [Sentence 7.6.3.2.(4) ](https://app.trax.co/browse/43c746629f/28cf3fed6f?id=OBCV1-DIVISION-B-PART-7-SECTION-7-6-3-_7-6-3-2-)and Tables [7.6.3.2.B. ](https://app.trax.co/browse/43c746629f/28cf3fed6f?id=OBCV1-DIVISION-B-PART-7-SECTION-7-6-3-_7-6-3-2-)and [7.6.3.2.C.](https://app.trax.co/browse/43c746629f/28cf3fed6f?id=OBCV1-DIVISION-B-PART-7-SECTION-7-6-3-_7-6-3-2-) [Table 7.6.3.2.B.](https://app.trax.co/browse/43c746629f/28cf3fed6f?id=OBCV1-DIVISION-B-PART-7-SECTION-7-6-3-_7-6-3-2-)\ Sizing of Water Distribution Systems for Urinals with Direct Flush Valves Forming Part of Sentences [7.6.3.2.(4) ](https://app.trax.co/browse/43c746629f/28cf3fed6f?id=OBCV1-DIVISION-B-PART-7-SECTION-7-6-3-_7-6-3-2-)and [7.6.3.4.(5)](https://app.trax.co/browse/43c746629f/28cf3fed6f?id=OBCV1-DIVISION-B-PART-7-SECTION-7-6-3-_7-6-3-4-) +-----------------+-----------------+-----------------+-----------------+ | Item | Column 1 | Column 2 | Column 3 | | | | | | | | Number of | Individual *Fix | *Fixture | | | Valves | ture | Units *in | | | | Units *Assigned | Accumulative | | | | in Decreasing | Values ^(1)^ | | | | Values | | +=================+=================+=================+=================+ | 1. | 1 | 20 | 20 | +-----------------+-----------------+-----------------+-----------------+ | 2. | 2 | 15 | 35 | +-----------------+-----------------+-----------------+-----------------+ | 3. | 3 | 10 | 45 | +-----------------+-----------------+-----------------+-----------------+ | 4. | 4 | 8 | 53 | +-----------------+-----------------+-----------------+-----------------+ | 5. | 5 or more | 5 each | 58, plus 5 for | | | | | each | | | | | additional *fix | | | | | ture *in | | | | | excess of 5 | +-----------------+-----------------+-----------------+-----------------+ : null null of Division B **Notes to [Table 7.6.3.2.B.:](https://app.trax.co/browse/43c746629f/28cf3fed6f?id=OBCV1-DIVISION-B-PART-7-SECTION-7-6-3-_7-6-3-2-)** ^(1) ^The accumulative *fixture unit *values are the total values to be used in conjunction with [Table 7.6.3.2.A.](https://app.trax.co/browse/43c746629f/28cf3fed6f?id=OBCV1-DIVISION-B-PART-7-SECTION-7-6-3-_7-6-3-2-) [Table 7.6.3.2.C.](https://app.trax.co/browse/43c746629f/28cf3fed6f?id=OBCV1-DIVISION-B-PART-7-SECTION-7-6-3-_7-6-3-2-)\ Sizing of Water Distribution Systems for Water Closets with Direct Flush Valves Forming Part of Sentences [7.6.3.2.(4) ](https://app.trax.co/browse/43c746629f/28cf3fed6f?id=OBCV1-DIVISION-B-PART-7-SECTION-7-6-3-_7-6-3-2-)and [7.6.3.4.(5)](https://app.trax.co/browse/43c746629f/28cf3fed6f?id=OBCV1-DIVISION-B-PART-7-SECTION-7-6-3-_7-6-3-4-) +-----------------+-----------------+-----------------+-----------------+ | Item | Column 1 | Column 2 | Column 3 | | | | | | | | Number of | Individual *Fix | *Fixture | | | Valves | ture | Units *in | | | | Units *Assigned | Accumulative | | | | in Decreasing | Values ^(1)^ | | | | Values | | +=================+=================+=================+=================+ | 1. | 1 | 40 | 40 | +-----------------+-----------------+-----------------+-----------------+ | 2. | 2 | 30 | 70 | +-----------------+-----------------+-----------------+-----------------+ | 3. | 3 | 20 | 90 | +-----------------+-----------------+-----------------+-----------------+ | 4. | 4 | 15 | 105 | +-----------------+-----------------+-----------------+-----------------+ | 5. | 5 or more | 10 for | 115, plus 10 | | | | each *public | for | | | | use , *and 6 | each *public | | | | for | use *additional | | | | each *private |  *fixture *in | | | | use* | excess of 5, | | | | | and 111, plus 6 | | | | | for | | | | | each *private | | | | | use *additional | | | | |  *fixture *in | | | | | excess of 5 | +-----------------+-----------------+-----------------+-----------------+ : null null of Division B **Notes to [Table 7.6.3.2.C.:](https://app.trax.co/browse/43c746629f/28cf3fed6f?id=OBCV1-DIVISION-B-PART-7-SECTION-7-6-3-_7-6-3-2-)** ^(1) ^The accumulative *fixture unit *values are the total values to be used in conjunction with [Table 7.6.3.2.A.](https://app.trax.co/browse/43c746629f/28cf3fed6f?id=OBCV1-DIVISION-B-PART-7-SECTION-7-6-3-_7-6-3-2-) [Table 7.6.3.2.D.](https://app.trax.co/browse/43c746629f/28cf3fed6f?id=OBCV1-DIVISION-B-PART-7-SECTION-7-6-3-_7-6-3-2-)\ Hydraulic Loads of Fixtures Not Listed in [Table 7.6.3.2.A.](https://app.trax.co/browse/43c746629f/28cf3fed6f?id=OBCV1-DIVISION-B-PART-7-SECTION-7-6-3-_7-6-3-2-) Forming Part of Sentences [7.6.3.2.(2) ](https://app.trax.co/browse/43c746629f/28cf3fed6f?id=OBCV1-DIVISION-B-PART-7-SECTION-7-6-3-_7-6-3-2-)and (3) and [7.6.3.4.(5)](https://app.trax.co/browse/43c746629f/28cf3fed6f?id=OBCV1-DIVISION-B-PART-7-SECTION-7-6-3-_7-6-3-4-) Item Column 1 Column 2 Column 3 ------ ---------------------------- --------------------------------- ------------ *Size *of Supply Pipe, in. Hydraulic Load, *fixture units* Private Use Public Use 1. ⅜ 1 2 2. ½ 2 4 3. ¾ 3 6 4. 1 6 10 : null null of Division B 7.6.3.3. Static Pressure **(1) **Where the static pressure at any *fixture *may exceed 550 kPa  , a pressure reducing valve conforming to [Article 7.2.10.12. ](https://app.trax.co/browse/43c746629f/28cf3fed6f?id=OBCV1-DIVISION-B-PART-7-SECTION-7-2-10-_7-2-10-12-)shall be installed to limit the maximum static pressure at the *fixture *to 550 kPa  . 7.6.3.4. Size[A-7.6.3.4.(5) Water System Pipe Size.](https://app.trax.co/browse/6c3e1f819b/1434f15d63?id=874419075ca61353f1543720673fa463) **(1) **Every *water service pipe *shall be sized according to the peak demand flow but shall not be less than ¾ in. in *size *. **(2) **Except as permitted in Sentence (3), the *size *of a supply pipe that serves a *fixture *or device shall conform to [Table 7.6.3.2.A.](https://app.trax.co/browse/43c746629f/28cf3fed6f?id=OBCV1-DIVISION-B-PART-7-SECTION-7-6-3-_7-6-3-2-) **(3) **For *fixtures *listed in [Table 7.6.3.2.A ](https://app.trax.co/browse/43c746629f/28cf3fed6f?id=OBCV1-DIVISION-B-PART-7-SECTION-7-6-3-_7-6-3-2-)that have a permitted supply pipe *size *of ⅜ in., a connector not more than 750 mm  long and not less than 6.3 mm  inside diameter may be used to supply water to the *fixture *or device. **(4) **No *water system *between the point of connection with the *water service pipe *or the water meter and the first branch that supplies a water heater that serves more than one *fixture *shall be less than ¾ in. in *size *. **(5) **Where both hot and cold water is supplied to *fixtures *in residential *buildings *containing more than one *dwelling unit *, the *water system *may be sized in accordance with [Table 7.6.3.4. ](https://app.trax.co/browse/43c746629f/28cf3fed6f?id=OBCV1-DIVISION-B-PART-7-SECTION-7-6-3-_7-6-3-4-)provided, \(a) the hydraulic loads for maximum separate demands on *water distribution system *piping are not less than 100% of the total hydraulic load of the *fixture units *given in Tables [7.6.3.2.A., 7.6.3.2.B., 7.6.3.2.C. ](https://app.trax.co/browse/43c746629f/28cf3fed6f?id=OBCV1-DIVISION-B-PART-7-SECTION-7-6-3-_7-6-3-2-)and [7.6.3.2.D. ](https://app.trax.co/browse/43c746629f/28cf3fed6f?id=OBCV1-DIVISION-B-PART-7-SECTION-7-6-3-_7-6-3-2-)for *private use *, \(b) the minimum water pressure at the entry to the *building *is 200 kPa  , and \(c) the total maximum length of the *water system *is 90 m. [Table 7.6.3.4.](https://app.trax.co/browse/43c746629f/28cf3fed6f?id=OBCV1-DIVISION-B-PART-7-SECTION-7-6-3-_7-6-3-4-)\ Water Pipe Sizing for Buildings Containing More Than One Dwelling Unit Forming Part of [Sentence 7.6.3.4.(5)](https://app.trax.co/browse/43c746629f/28cf3fed6f?id=OBCV1-DIVISION-B-PART-7-SECTION-7-6-3-_7-6-3-4-) Item Column 1 Column 2 Column 3 ------ --------------------------- --------------------------------- ---------- *Size *of Water Pipe, in. Water Velocity m/s ^(1)^ 2.4 1.5 Hydraulic Load, *fixture units* 1. 1/2 7 4 2. 3/4 16 9 3. 1 31 18 4. 1-1/4 57 30 : null null of Division B **Notes to [Table 7.6.3.4. ](https://app.trax.co/browse/43c746629f/28cf3fed6f?id=OBCV1-DIVISION-B-PART-7-SECTION-7-6-3-_7-6-3-4-):** ^(1) ^[Table 7.6.3.4. ](https://app.trax.co/browse/43c746629f/28cf3fed6f?id=OBCV1-DIVISION-B-PART-7-SECTION-7-6-3-_7-6-3-4-)is not intended to limit water velocities that are permitted by [Sentence 7.6.3.5.(1) ](https://app.trax.co/browse/43c746629f/28cf3fed6f?id=OBCV1-DIVISION-B-PART-7-SECTION-7-6-3-_7-6-3-5-). **(6) **Where both hot and cold water is supplied to *fixtures *in a *house *containing only one *dwelling unit *, the *water service pipe *is permitted to be a minimum of ¾ in. in *size *provided, \(a) a minimum ¾ in. water supply piping located in the *basement *or lower level is extended to the base of every hot and cold *riser *that serves a maximum of one *bathroom group *and to the last water supply branch serving any *basement bathroom group *, *fixture *supply or hose bibb, and \(b) the total hydraulic load is not more than 26 *fixture units *, using the values given in [Table 7.6.3.2.A.](https://app.trax.co/browse/43c746629f/28cf3fed6f?id=OBCV1-DIVISION-B-PART-7-SECTION-7-6-3-_7-6-3-2-) 7.6.3.5. Velocity **(1) **The maximum permitted water velocities shall be those recommended by the pipe and fitting manufacturer. 7.6.4. Water Efficiency 7.6.4.1. Water Supply Fittings[A-7.6.4.1.(3) and (5) Automatic Shut-off of Water Flow.](https://app.trax.co/browse/6c3e1f819b/1434f15d63?id=04119cec5f5e54a1ffffd2efc86d94f1)[A-7.6.4.1.(4) Automatic Compensating Valves.](https://app.trax.co/browse/6c3e1f819b/1434f15d63?id=f4cb013fb70c90f7f4371d32836d2d87) **(1) **The flow rates of fittings that supply water to a *fixture *shall not exceed the maximum flow rates at the test pressures listed for that fitting in [Table 7.6.4.1.](https://app.trax.co/browse/43c746629f/28cf3fed6f?id=OBCV1-DIVISION-B-PART-7-SECTION-7-6-4-_7-6-4-1-) [Table 7.6.4.1.](https://app.trax.co/browse/43c746629f/28cf3fed6f?id=OBCV1-DIVISION-B-PART-7-SECTION-7-6-4-_7-6-4-1-)\ Maximum Flow Rates for Water Supply Fittings Forming Part of [Sentence 7.6.4.1.(1)](https://app.trax.co/browse/43c746629f/28cf3fed6f?id=OBCV1-DIVISION-B-PART-7-SECTION-7-6-4-_7-6-4-1-) +-----------------+-----------------+-----------------+-----------------+ | Item | Column 1 | Column 2 | Column 3 | | | | | | | | Fitting | Maximum Flow, | Test Pressure, | | | | L/min | kPa | +=================+=================+=================+=================+ | 1. | Lavatory | 5.7 | 413 | | | Faucets | | | | | in *Residential | | | | | Occupancy* | | | +-----------------+-----------------+-----------------+-----------------+ | 2. | Lavatory | 1.9 | 413 | | | Faucets in | | | | | Other *Occupanc | | | | | ies* | | | +-----------------+-----------------+-----------------+-----------------+ | 3. | Kitchen Faucet | 8.35 | 413 | +-----------------+-----------------+-----------------+-----------------+ | 4. | Shower Heads | 7.6 | 550 | | | in *Residential | | | | | Occupancy* | | | +-----------------+-----------------+-----------------+-----------------+ | 5. | Shower Heads in | 9.5 | 550 | | | Other *Occupanc | | | | | ies* | | | +-----------------+-----------------+-----------------+-----------------+ : null null of Division B **(2) **Sentence (1) does not apply to a *fixture *located in a *heritage building *. **(3) **Each lavatory in a washroom with *fixtures *for *public use *shall be equipped with a device capable of automatically shutting off the flow of water when the lavatory is not in use. **(4) **An automatic compensating valve serving an individual shower head shall have a manufacturer's minimum-rated water flow rate equal to or less than the shower head it serves. **(5) **Where multiple shower heads installed in a public showering facility are served by one temperature control, each shower head shall be equipped with a device capable of automatically shutting off the flow of water when the shower head is not in use. 7.6.4.2. Plumbing Fixtures[A-7.6.4.2.(4) Plumbing Fixtures.](https://app.trax.co/browse/6c3e1f819b/1434f15d63?id=c4ea4c085fc72f8a98de14d13cb5e796) **(1) **Water closets and urinals shall be certified to CAN/CSA-B45.0, "General Requirements for Plumbing Fixtures". **(2) **Except as provided in Sentence (3), the flush cycle for each *fixture *that is a water closet or urinal shall not exceed the maximum water consumption per flush cycle listed for that *fixture *in [Table 7.6.4.2.A.](https://app.trax.co/browse/43c746629f/28cf3fed6f?id=OBCV1-DIVISION-B-PART-7-SECTION-7-6-4-_7-6-4-2-) [Table 7.6.4.2.A.](https://app.trax.co/browse/43c746629f/28cf3fed6f?id=OBCV1-DIVISION-B-PART-7-SECTION-7-6-4-_7-6-4-2-)\ Maximum Water Consumption per Flush Cycle for Sanitary Fixtures Forming Part of [Sentence 7.6.4.2.(2)](https://app.trax.co/browse/43c746629f/28cf3fed6f?id=OBCV1-DIVISION-B-PART-7-SECTION-7-6-4-_7-6-4-2-) +-----------------------+-----------------------+-----------------------+ | Item | Column 1 | Column 2 | | | | | | | *Fixture* | Maximum Water | | | | Consumption per Flush | | | | Cycle, LPF | +=======================+=======================+=======================+ | 1. | Water Closet (Tank | 6.0 | | | Type) | | +-----------------------+-----------------------+-----------------------+ | 2. | Water Closet (Direct | 6.0 | | | Flush) | | +-----------------------+-----------------------+-----------------------+ | 3. | Urinal (Tank Type) | 1.9 | +-----------------------+-----------------------+-----------------------+ | 4. | Urinal (Direct Flush) | 1.9 | +-----------------------+-----------------------+-----------------------+ : null null of Division B ^(1) ^Revoked : O. Reg. 88/19, s. 180 (1). **(3) **In *buildings *classified as Group C *occupancy *, the flush cycle for each *fixture *that is a water closet or urinal shall not exceed the maximum water consumption per flush cycle listed for that *fixture *in [Table 7.6.4.2.B.](https://app.trax.co/browse/43c746629f/28cf3fed6f?id=OBCV1-DIVISION-B-PART-7-SECTION-7-6-4-_7-6-4-2-) [Table 7.6.4.2.B.](https://app.trax.co/browse/43c746629f/28cf3fed6f?id=OBCV1-DIVISION-B-PART-7-SECTION-7-6-4-_7-6-4-2-)\ Maximum Water Consumption per Flush Cycle for Sanitary Fixtures in a Group C Occupancy Forming Part of [Sentence 7.6.4.2.(3)](https://app.trax.co/browse/43c746629f/28cf3fed6f?id=OBCV1-DIVISION-B-PART-7-SECTION-7-6-4-_7-6-4-2-) +-----------------------+-----------------------+-----------------------+ | Item | Column 1 | Column 2 | | | | | | | *Fixture* | Maximum Water | | | | Consumption per Flush | | | | Cycle, LPF | +=======================+=======================+=======================+ | 1. | Water Closet (Tank | 4.8 ^(1)^ | | | Type) | | +-----------------------+-----------------------+-----------------------+ | 2. | Water Closet (Direct | 4.8 | | | Flush) | | +-----------------------+-----------------------+-----------------------+ | 3. | Urinal (Tank Type) | 1.9 | +-----------------------+-----------------------+-----------------------+ | 4. | Urinal (Direct Flush) | 1.9 | +-----------------------+-----------------------+-----------------------+ : null null of Division B **Notes to [Table 7.6.4.2.B.:](https://app.trax.co/browse/43c746629f/28cf3fed6f?id=OBCV1-DIVISION-B-PART-7-SECTION-7-6-4-_7-6-4-2-)** ^(1) ^Water closets which provide a dual flush cycle option of both 4.1 LPF or less and 6.0 LPF are deemed to comply. ^(2) ^Revoked : O. Reg. 88/19, s. 180 (2). **(4) **Sentences (2) and (3) do not apply to a *fixture *located in an existing *building *where the *chief building official *is satisfied that compliance with the requirement is impracticable because of maintenance or operational difficulties. **(5) **Urinals shall be equipped with a device capable of preventing automatic flush cycles when not in use. 7.6.5. Water Temperature Control[A-7.6.5. Hot Water Temperature.](https://app.trax.co/browse/6c3e1f819b/1434f15d63?id=7b9739f40240e1eccb7b295fe5ea60b6) 7.6.5.1. Maximum Temperature of Hot Water **(1) **Except as provided in Sentences (2) and [7.6.5.3.(1) ](https://app.trax.co/browse/43c746629f/28cf3fed6f?id=OBCV1-DIVISION-B-PART-7-SECTION-7-6-5-_7-6-5-3-), the maximum temperature of hot water supplied by fittings to *fixtures *in a *residential occupancy *shall not exceed 49°C  . **(2) **Sentence (1) does not apply to hot water supplied to installed dishwashers or clothes washers. 7.6.5.2. Showers **(1) **Except as provided for in Sentences (2) and (3), all valves supplying fixed location shower heads, shall be individually pressure-balanced or thermostatic-mixing valves, conforming to ASME A112.18.1 / CSA B125.1, "Plumbing Supply Fittings". **(2) **An individually pressure-balanced or thermostatic-mixing valve is not required for shower heads having a single tempered water supply that is controlled by an automatic compensating valve conforming to CSA B125.3, "Plumbing Fittings". **(3) **Deck-mounted, hand-held, flexible-hose spray attachments are exempt from the thermal shock requirements of Sentences (1) and (4). **(4) **Pressure-balanced, thermostatic-mixing or combination pressure-balanced and thermostatic-mixing type valves shall be, \(a) capable of limiting thermal shock, and \(b) designed so that the outlet temperature does not exceed 49°C  or equipped with high-limit stops which shall be adjusted to a maximum hot water setting of 49°C  . 7.6.5.3. Temperature Control Devices **(1) **A *water distribution system *supplying hot water to any bathtub, shower or hand basin that is accessible to a patient or resident in a Group B, Division 2 or 3 occupancy or a resident of a group home, *home for special care *or residence for adults with developmental disabilities shall have one or more temperature gauges and control devices that are, \(a) accessible only to supervisory staff, and \(b) capable of being adjusted to ensure that the temperature of the water supplied to the *fixtures *does not exceed 49°C  .