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§ 28-601.1 Update.
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Chapter 1: Administration
Chapter 2: Definitions
Chapter 3: General Regulations
Chapter 4: Fixtures, Faucets and Fixture Fittings
Chapter 5: Water Heaters
Chapter 6: Water Supply and Distribution
Section PC 601: General
Section PC 602: Water Required
Section PC 603: Water Service
Section PC 604: Design of Building Water Distribution System
Section PC 605: Materials, Joints and Connections
Section PC 606: Installation of the Building Water Distribution System
Section PC 607: Hot Water Supply System
Section PC 608: Protection of Potable Water Supply
608.1 General.
608.2 Plumbing fixtures.
608.3 Devices, appurtenances, appliances and apparatus.
608.3.1 Special equipment, water supply protection.
608.4 Water service piping.
608.5 Chemicals and other substances.
608.6 Cross connection control.
608.6.1 Private water supplies.
608.7 Valves and outlets prohibited below grade.
608.8 Identification of nonpotable water systems.
608.8.1 Signage required.
608.8.2 Distribution pipe labeling and marking.
608.8.2.1 Color.
608.8.2.2 Lettering size.
608.8.2.3 Identification tape.
608.9 Reutilization prohibited.
608.10 Reuse of piping.
608.11 Painting of water tanks.
608.12 Pumps and other appliances.
608.13 Backflow protection.
608.13.1 Air gap.
608.13.2 Reduced pressure principle backflow prevention assemblies.
608.13.3 Backflow preventer with intermediate atmospheric vent.
608.13.4 Barometric loop.
608.13.5 Pressure vacuum breaker assemblies.
608.13.6 Atmospheric-type vacuum breakers.
608.13.7 Double check backflow prevention assemblies.
608.13.8 Spill-resistant pressure vacuum breaker assemblies.
608.13.9 Chemical dispenser backflow devices.
608.13.10 Dual check backflow preventer.
608.14 Location of backflow preventers.
608.14.1 Outdoor enclosures for backflow prevention devices.
608.14.2 Protection of backflow preventers.
608.14.2.1 Relief port piping.
608.15 Protection of potable water outlets.
608.15.1 Protection by air gap.
608.15.2 Protection by reduced pressure principle backflow prevention assembly.
608.15.3 Protection by a backflow preventer with intermediate atmospheric vent.
608.15.4 Protection by a vacuum breaker.
608.15.4.1 Deck-mounted and integral vacuum breakers.
608.15.4.2 Hose connections.
608.16 Connections to the potable water system.
608.16.1 Beverage dispensers.
608.16.2 Connections to boilers.
608.16.3 Heat exchangers.
608.16.4 Connections to automatic fire sprinkler systems and standpipe systems.
608.16.4.1 Additives or nonpotable source.
608.16.5 Connections to lawn irrigation systems.
608.16.6 Connections subject to backpressure.
608.16.7 Chemical dispensers.
608.16.8 Portable cleaning equipment.
608.16.9 Dental pump equipment.
608.16.10 Coffee machines and noncarbonated beverage dispensers.
608.17 Protection of individual water supplies.
608.17.1 Well locations.
608.17.2 Elevation.
608.17.3 Depth.
608.17.4 Water-tight casings.
608.17.5 Drilled or driven well casings.
608.17.6 Dug or bored well casings.
608.17.7 Cover.
608.17.8 Drainage.
Section PC 609: Health Care Plumbing
Section PC 610: Disinfection of Potable Water System
Section PC 611: Drinking Water Treatment Units
Section PC 612: Solar Systems
Section PC 613: Temperature Control Devices and Valves
Section PC 614: Emergency Drinking Water Access
Chapter 7: Sanitary Drainage
Chapter 8: Indirect/special Waste
Chapter 9: Vents
Chapter 10: Traps, Interceptors and Separators
Chapter 11: Storm Drainage
Chapter 12: Special Piping and Storage Systems
Chapter 13: Nonpotable Water Systems
Chapter 14: Subsurface Landscape Irrigation Systems
Chapter 15: Referenced Standards
Appendix A: Reserved
Appendix B: Reserved
Appendix C: Structural Safety
Appendix D: Reserved
Appendix E: Sizing of Water Piping System
Appendix F: Repealed
Appendix G: Repealed
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608.10 Reuse of piping.
Piping that has been utilized for any purpose other than conveying potable water shall not be utilized for conveying potable water.
608.11 Painting of water tanks.
The interior surface of a potable water tank shall not be lined, painted or repaired with any material that changes the taste, odor, color or potability of the water supply when the tank is placed in, or returned to, service. Linings, paints, and repairs must be in accordance with the requirements of the Department of Health and Mental Hygiene.
608.12 Pumps and other appliances.
Water pumps, filters, softeners, tanks and other devices that handle or treat potable water shall be protected against contamination.
608.13 Backflow protection.
Means of protection against secondary backflow shall be provided in accordance with Sections 608.13.1 through 608.13.10 and tested and inspected in accordance with Chapter 3.
608.13.1 Air gap.
The minimum required air gap shall be measured vertically from the lowest end of a potable water outlet to the flood level rim of the fixture or receptacle into which such potable water outlet discharges. Air gaps shall comply with ASME A112.1.2 and air gap fittings shall comply with ASME A112.1.3.
608.13.2 Reduced pressure principle backflow prevention assemblies.
Reduced pressure principle backflow prevention assemblies shall conform to ASSE 1013, AWWA C511, CSA B64.4 or CSA B64.4.1. Reduced pressure detector assembly backflow preventers shall conform to ASSE 1047. These devices shall be permitted to be installed where subject to continuous pressure conditions. The relief opening shall discharge by air gap and shall be prevented from being submerged.
608.13.3 Backflow preventer with intermediate atmospheric vent.
Backflow preventers with intermediate atmospheric vents shall conform to ASSE 1012 or CSA B64.3. These devices shall be permitted to be installed where subject to continuous pressure conditions. The relief opening shall discharge by air gap and shall be prevented from being submerged.
608.13.4 Barometric loop.
Barometric loops shall precede the point of connection and shall extend vertically to a height of 35 feet (10 668 mm). A barometric loop shall only be utilized as an atmospheric-type or pressure-type vacuum breaker.

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