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~. 203.2 All piping in the system con- forms to the piping specifications of this standard. 203.3 Permitted by the local plumb- ing or health authority. Sec. 9.204 Mobile Home Water Supply A water supply for a sprinklered dwelling manufactured off-site shall not be less than that specified on the manufacturer's nameplate. CHAPTER 3 System Components Sec. 9.301 Valves and Drains 301.1 Each system shall have a single control valve arranged to shut off both the domestic and sprinkler systems. Exception: The sprinkler system piping may have a separate control valve where supervised by one of the following methods: a. To Underwriters Laboratory listed central station b. Local alarm service which will cause the sounding of an audible signal at a constantly attended point. 301.2 Each sprinkler system shall have a '/2 inch or larger drain and test connection with valve on the system side of the control valve and flow switch. 20.08.049 301.3 Additional drains shall be in- stalled for each trapped portion which is subject to freezing tempera- tures. 301.4 One (1) -Underwriters Labo- ratory (UL), Factory Mutual (FM) and/or American Water Works Asso- ciation (AWWA) listed check valves shall be installed in each sprinkler riser. Check valves shall meet City water service approved list of accept- able check valves that act as an ac- ceptable backflow device which protects the potable water system. Sec. 9.303 Piping 303.1 Pipe or tube used in sprinkler systems shall be of the materials in accordance with the chemical proper- ties, physical properties; dimensions of the materials listed in 9.501.1 and 9.501.2 shall be at least equivalent to the standards cited in the table and designed to withstand a working pressure of not less than 175 psi (12.1 bars) cold water pressure. 303.2 Other types of pipe or tube may be used, but only those inves- tigated and listed for this service by a testing and inspection agency labo- ratory. 303.3 Whenever the word pipe is used in this standard, it shall be understood to also mean tube. 303.4 Fittings used in sprinkler sys- tems shall be of the materials listed '700_5 (Pleasanton April 2000)