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Section 501.2.2.2 Health hazards. The material categories listed in this section are classified as health hazards. A material with a primary classification as a health hazard can also pose a physical hazard. 1. Highly toxic, toxic and moderately toxic. 2. Corrosive materials. 20.24.250 CFC Section 5003.2.2.1 Item 7 added — Secondary containment. Section 5003.2.2.1 Item 7 is added to read: 7. Secondary containment or equivalent protection from spills shall be provided for piping for liquid hazardous materials where a spill is determined to be a plausible event and where such an event would endanger people, property or the environment and for highly toxic, toxic, and corrosive gases above threshold quantities listed in Tables 3704.2 and 3704.3. Secondary containment includes, but is not limited to double walled piping. Exceptions: 1. Secondary containment is not required for corrosive gases if the piping is constructed of inert materials. 2. Piping under sub - atmospheric conditions if the piping is equipped with an alarm and fail- safe -to -close valve activated by a loss of vacuum. 20.24.260 CFC Section 5003.2.2.1 Item 8 added — Low melt point materials. Section 5003.2.2.1 Item 8 is added to read: 8. Low melt point materials, such as plastic, shall not be used for oxidizing materials, flammable materials, combustible liquids, pyrophoric materials, toxic gases, highly toxic gases, or moderately toxic gases. Exception: Facility specific systems approved by the Fire Chief. 20.24.270 CFC Section 5003.2.2.2 amended — Additional regulations for supply piping for health hazard materials. Section 5003.2.2.2 is amended to read: 5003.2.2.2 Additional regulations for supply piping for health hazard materials. Supply piping and tubing for gases and liquids having a health hazard ranking of 3 or 4 in accordance with NFPA 704 shall be in accordance with ASME B31.3 and the following: