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(c) *  *  *

(1) All points of crossover beneath the transportable sections must be readily accessible from the exterior of the home. In multi-story manufactured homes, the interconnections between stories must be accessible through a panel on the exterior or interior of the manufactured home.

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(k) Identification of gas supply connections. Each manufactured home must have permanently affixed to the exterior skin at or near each gas supply connection or the end of the pipe, a tag of 3 inches by 13⁄4 inches minimum size, made of etched, metal-stamped or embossed brass, stainless steel, anodized or alcalde aluminum not less than 0.020 inch thick, or other approved material [e.g., 0.005 inch plastic laminates], with the information shown in Figure 1 to this paragraph (k). The connector capacity indicated on this tag must be equal to or greater than the total Btu/hr rating of all intended gas appliances.

(l) *  *  *

(7) Hangers and supports. All horizontal gas piping must be adequately supported by galvanized or equivalently protected metal straps or hangers at intervals of not more than 4 feet, except where adequate support and protection is provided by structural members. Vertical gas piping in multi-story dwelling units must be supported at intervals of not more than 6 feet. Solid iron-pipe connection(s) must be rigidly anchored to a structural member within 6 inches of the supply connection(s).

(8) *  *  * (i) Before appliances are connected, piping systems must stand a pressure of three ± 0.2 psi gauge for a period of not less than ten minutes without showing any drop in pressure. Pressure must be measured with a mercury manometer or slope gauge calibrated so as to be read in increments of not greater than one-tenth pound, or an equivalent device. The source of normal operating pressure must be isolated before the pressure tests are made. Before a test is begun, the temperature of the ambient air and of the piping must be approximately the same, and constant air temperature must be maintained throughout the test.

*   *   *   *   *

(iii) Where gas piping between transportable sections must be made on site, the installation instructions must contain provisions for onsite testing for leakage consistent with the provisions in paragraph (l)(8)(i) of this section.

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