7.6.2. Protection from Contamination — OBC 2006 (in force 31 December 2006 to 1 January 2014)

7.6.2. — Protection from Contamination

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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.

Editor's note

This map follows the as-filed text of O. Reg. 350/06 for Article 7.6.2.1. of Division B, which uses the hyphenated defined term 'drinking-water system'. As of its July 1, 2007 re-render the e-Laws consolidation de-hyphenates the term to 'drinking water system', with no amending regulation making the change — no regulation in force on that date amends this Article. This map preserves the as-filed hyphenation.

Text · e-Laws consolidated snapshot

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.

Editor's note

As filed in O. Reg. 350/06, this heading reads 'Back Siphonage' (two words); the consolidated e-Laws text hyphenates it ('Back-Siphonage'). The as-filed heading is retained here.

Text · e-Laws consolidated snapshot

7.6.2.3. — Reserved.

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Editor's note

As filed in O. Reg. 350/06, the heading of this article reads 'Reserved.' with a closing period. The consolidated e-Laws text renders it without the period ('Reserved'); the as-filed heading is retained here.

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 Clauses (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.

(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 CAN/CSA-B64.4.1, “Backflow Preventers, Reduced Pressure Principle Type for Fire Systems (RPF)”, shall also be provided on the fire service connection.

(5) Except as permitted in Sentences (1) and (8), backflow preventers shall be selected, installed and tested in conformance with CAN/CSA-B64.10 “Manual for the Selection and Installation of Backflow Prevention Devices”.

(6) Backflow prevention devices shall be provided in conformance with Sentence 7.2.10.10.(1)v1.

(7) Tank type water closet valves shall be provided with a back-siphonage preventer in conformance with Sentence 7.2.10.10.(2)v1.

(8) 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.

(9) In addition to the backflow preventer required by this Subsection, for buildings or facilities where a potentially severe health hazard may be caused by backflow, the potable water system shall be provided with premise isolation by the installation of a reduced pressure principle backflow preventer .

Editor's note

In Clause 7.6.2.4.(2)(d), the cross-reference is filed in O. Reg. 350/06 in the plural as 'protected as required by Clauses (b) or (c)'; this map reproduces the source as filed. The e-Laws consolidation renders it in the singular as 'Clause (b) or (c)'. In the notes to Table 7.6.2.4., the legend is filed with a space before each dash ('P – Permitted', 'NP – Not Permitted'); the e-Laws consolidation closes both ('P–', 'NP–'). These changes were not enacted by an amending regulation.

Text · e-Laws consolidated snapshot

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

Notes to Table 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 CAN/CSA-B64.10 “Manual for the Selection and Installation of Backflow Prevention Devices”.

7.6.2.5. — Reserved.

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Editor's note

As filed in O. Reg. 350/06, the heading of this article reads 'Reserved.' with a closing period. The consolidated e-Laws text renders it without the period ('Reserved'); the as-filed heading is retained here.

7.6.2.6. — Reserved.

Content not available for this version.

Editor's note

As filed in O. Reg. 350/06, the heading of this article reads 'Reserved.' with a closing period. The consolidated e-Laws text renders it without the period ('Reserved'); the as-filed heading is retained here.

7.6.2.7. — Reserved.

Content not available for this version.

Editor's note

As filed in O. Reg. 350/06, the heading of this article reads 'Reserved.' with a closing period. The consolidated e-Laws text renders it without the period ('Reserved'); the as-filed heading is retained here.

7.6.2.8. — Cleaning of Systems

(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.

Text · e-Laws consolidated snapshot

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.

Text · e-Laws consolidated snapshot

7.6.2.10. — Vacuum Breakers and Flood Levels

(1) Where the critical level is not marked on an atmospheric vacuum breaker or 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 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.

Text · e-Laws consolidated snapshot

7.6.2.

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