ANSI/CAN/UL/ULC1254:2022

1 Scope 1.1 These requirements cover the construction and operation of fixed pre-engineered dry chemical fire extinguishing system units and fixed automatic extinguisher units intended to be used in accordance with the Standard for Dry Chemical Extinguishing Systems, NFPA 17 and with the National Fire Code of Canada, asapplicable; and; fixedpre-engineered wet chemical fireextinguishing system unitsintendedto be used in accordance with the Standard for Wet Chemical Extinguishing Systems, NFPA 17A; and with theNationalFireCodeofCanada,asapplicable. 1.2 Automatic extinguisher units do not have a manual means of operation and are intended to be used in accordance with the manufacturer's installation instructions. Automatic extinguisher units are not intended for use as a substitute for pre-engineered dry chemical extinguishing system units, or for protection of fire risks larger than those specified in the manufacturer's instructions for a single unit by usingmultipleunits. 1.3 Pre-engineereddrychemicalextinguishingsystemunitscoveredbytheserequirementsareintended tobeusedinthefollowingfireprotectionsystems: a) Industrial Total Flooding Protection System – A system arranged to discharge dry chemical throughout the intended protected volume. See Fire Test – Total Flooding Protection System, Section26. b) Class B Local Application Protection System – A system arranged to discharge dry chemical directly onto a specific area of protection. This application of chemical is normally used where no fixed enclosure exists or an extinguishing system is unable to totally flood the fixed enclosure to achieveextinguishment.SeeFireTest–ClassBLocalApplicationProtectionSystem,Section27. c) Commercial Cooking Equipment Protection System – A system arranged to discharge dry chemical onto cooking surfaces of cooking appliances and into hood and duct systems used for ventilation of commercial cooking appliances. See the Standard for Fire Testing of Fire ExtinguishingSystemsforProtectionofCommercialCookingEquipment,UL300. d) Automobile Service Station Fueling Area Protection System – A system arranged to discharge dry chemical directly onto small spill fires that originate and are maintained within the protected area.SeeFireTest–AutomobileServiceStationFuelingAreaProtectionSystem,Section28. e) Open-Face Paint Spray Booth Protection System – A system arranged to discharge dry chemical into paint spray working areas and into the plenum and duct systems used for ventilation of paint spraying operations. See Fire Test – Open-Face Point Spray Booth Protection System, Section29. f) Vehicle Paint Spray Booth – A system arranged to discharge dry chemical into paint spray working areas and onto the plenum and duct systems used for ventilation of paint spraying operations.SeeFireTest–VehiclePaintSprayBoothProtectionSystem,Section30. g)Off-the-RoadVehicleProtectionSystem–Asystemarrangedtodischargedrychemicalontofire riskareasandintovolumesofvehiclessuchasabovegroundmobileminingequipment,andmobile earthmoving equipment. See Fire Test – Total Flooding Protection System, Section 26, and/or Fire Test–ClassBLocalApplicationProtectionSystem,Section27,asapplicable. 1.4 Pre-engineered wet chemical extinguishing system units covered by these requirements are intendedtobeusedinthefollowingfireprotectionsystems: a) Commercial Cooking Equipment Protection System – A system arranged to discharge wet chemical onto cooking surfaces of cooking appliances and into hood and duct systems used for