For purposes of this subchapter, the following words shall have the meaning as set out below. As to terms not defined below, the definitions established by the North Carolina Building Code shall apply.
ACCEPTED STANDARDS FOR DEVICES. All in-line testable backflow prevention assemblies must meet or exceed standards set forth by USCFCCHR (The University of Southern California Foundation for Cross-Connection Control and Hydraulic Research) and/or ASSE (The American Society of Sanitary Engineering) by being on the agencies’ approval list. Non-in-line testable backflow prevention devices must meet or exceed standards set forth by ASSE. Backflow prevention assemblies to be used in fire suppression systems must have the additional approval of FM (Factory Mutual) and comply with the NFPA (National Fire Protection Association) Code. To determine whether a particular size and model is approved by the above agencies, contact the city’s Cross-Connection Control Office.
APPROVED. Authorized or accepted as satisfactory to the Cross-Connection Control Inspector.
ATMOSPHERIC VACUUM BREAKER (ASSE APPROVAL #1001). May be used at the discharge of the control valve when located at least six inches above the flood rim of the container. This device shall not be subject to continuous pressure or backpressure backflow. This device shall not include contact with toxic chemicals or liquids that may be a health hazard.
BACKFLOW PREVENTION DEVICE. Any effective device or method used to prevent backflow or backsiphonage into the potable water system. The type of device required shall be based on degree of hazard, existing or potential.
CERTIFIED TESTER. A person who has proven his or her competency to test, repair, overhaul and make reports on backflow prevention devices as evidenced by certification or successful completion of a training program approved by the Director of Water Resources.
CONTINUOUS PRESSURE. Twelve (12) or more hours of water usage in any 24-hour period.
CROSS-CONNECTION CONTROL INSPECTOR. The official position established and authorized by the city to administer and enforce the provisions of the cross-connection control regulations. The CROSS-CONNECTION CONTROL INSPECTOR shall be certified as a backflow device technician by a recognized research center and as a North Carolina Plumbing Inspector Level III.
DOUBLE CHECK VALVE ASSEMBLY. An assembly composed of two single, independently acting, approved check valves, including tightly closing shut-off valves located at each end of the assembly, and having suitable connections for testing the water tightness of each check valve.
DOUBLE CHECK VALVE ASSEMBLY (ASSE APPROVAL #1015). This device may be used singly or in parallel with any flow requirements. This device shall not include contact with toxic chemicals or liquids that may be a health hazard.
FIRELINE. A system of pipes and equipment used exclusively to supply water in an emergency for extinguishing fire.
HIGH HAZARD (HEALTH HAZARD). Actual or potential threat of contamination that presents an imminent danger to the public health with consequence of serious illness or death.
HOSE BIBB VACUUM BREAKER (ASSE APPROVAL #1011). May be used on hose bibbs and hose hydrants except when usage would be at a point six inches higher than the vacuum breaker and when usage would include contact with toxic chemicals or liquids which may be a health hazard.
LOW HAZARD (NON-HEALTH HAZARD). One that presents foreseeable and significant potential for pollution, nuisance, aesthetically objectionable or other undesirable alterations of the drinking water supply.
PRESSURE TYPE VACUUM BREAKER (ASSE APPROVAL #1020). This assembly must be installed at a minimum of 12 inches above all downstream piping and shall not be subjected to backpressure backflow. It may be used under continuous pressure applications.
READILY ACCESSIBLE. Having direct access to a backflow preventer without the need of removing any panel, door or similar covering of the item described, and without requiring the use of portable ladders, chairs, and the like.
REDUCED PRESSURE ASSEMBLY (ASSE APPROVAL #1013). A device containing within its structure a minimum of two independently acting, approved check valves, together with an automatically operating pressure differential relief valve located between the two check valves. The first check valve reduces the supply pressure a predetermined amount so that during normal flow and at cessation of normal flow the pressure between the checks shall be less than the supply pressure. In case of leakage of either check valve, the differential relief valve, by discharging to atmosphere, shall operate to maintain the pressure between the checks less than the supply pressure.
(Ord. 23-38, passed 11-9-2023)