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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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608.8.2.1 Color.
The color of the pipe identification shall be discernable and consistent throughout the building. The color purple shall be used to identify nonpotable water distribution systems.
608.8.2.2 Lettering size.
The size of the background color field and lettering shall comply with Table 608.8.2.2.
Table 608.8.2.2
Size of Pipe Identification
 
Pipe Diameter
(inches)
Length Background
Color Field
(inches)
Size of Letters
(inches)
3/4 to 1 1/4
8
0.5
1 1/2 to 2
8
0.75
2 1/2 to 6
12
1.25
8 to 10
24
2.5
over 10
32
3.5
 
For SI: 1 inch = 25.4 mm.
608.8.2.3 Identification tape.
Where used, identification tape shall be at least 3 inches (76 mm) wide and have white or black lettering on a purple field stating "CAUTION: NONPOTABLE WATER – DO NOT DRINK." Identification tape shall be installed on top of nonpotable water distribution pipes, fastened at least every 10 feet (3048 mm) to each pipe length and run continuously the entire length of the pipe.

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