Section 5466 - Design of Hydrogen Systems(a) Hydrogen containers shall comply with one of the following: (1) Designed, constructed, and tested in accordance with appropriate requirements of ASME Boiler and Pressure Vessel Code, Section VIII Unfired Pressure Vessels (1974).(2) Designed, constructed, tested and maintained in accordance with U.S. Department of Transportation (formerly Interstate Commerce Commission) Specifications and Regulations.(b) Permanently installed containers shall be provided with substantial noncombustible supports on firm, noncombustible foundations.(c) Each portable container and manifold hydrogen supply unit shall be legibly marked with the name HYDROGEN or a legend such as "This unit contains hydrogen," the height of the letters shall not be less than 1/25th of the diameter of the cylinder, the stroke shall be not less than 1/8th inch.Cal. Code Regs. Tit. 8, § 5466