Notes to Table 7.4.10.9.:
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 CAN/CSA-B64.6.1, “Backflow Preventers, Dual Check Valve Type for Fire Systems (DuCF)”, (b) Class 1 fire sprinkler/standpipe systems shall be protected by a single check valve backflow preventer conforming to CAN/CSA-B64.9, “Backflow Preventers, Single Check Valve Type for Fire 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 CAN/CSA-B64.5.1, “Backflow Preventers, Double Check Valve Type for Fire 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 CAN/CSA-B64.4.1, “Backflow Preventers, Reduced Pressure Principle Type for Fire 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 5 fire sprinkler/standpipe systems shall be protected by a reduced pressure principle backflow preventer conforming to CAN/CSA-B64.4.1, “Backflow Preventers, Reduced Pressure Principle Type for Fire Systems (RPF)”, (f) Class 6 fire sprinkler/standpipe systems shall be protected, (i) by a double check valve backflow preventer conforming to CAN/CSA-B64.5.1, “Backflow Preventers, Double Check Valve Type for Fire Systems (DCVAF)”, or (ii) where a potentially severe health hazard may be caused by backflow, by a reduced pressure principle backflow preventer conforming to CAN/CSA- B64.4.1, “Backflow Preventers, Reduced Pressure Principle Type for Fire Systems (RPF)”, and (g) backflow prevention devices on fire sprinkler and standpipe systems shall be selected and installed in conformance with Table 7.6.2.4. Table 7.6.2.4.   Backflow Prevention Devices on Fire Sprinkler and Standpipe Systems Forming Part of Sentences 7.6.2.4.(2)  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


B64.6.1

DuCF

P

NP

NP

NP


B64.9

SCVAF

P

P

NP

NP


B64.5.1

DCVAF

P

P

P

NP


B64.4.1

RPF

P

P

P

P