Regulating the Erection, Construction, Repair, Alteration, Location of all Electric Signs

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not normally exposed to mechanical injury. If operating in excess of 7,500 volts, the tubing shall be supported on non - combustible, non- absorp- tive, insulating supports which maintain a spacing of not less than 1/4 inch between the tubing and the nearest surface. (D) TERMINALS AND RECEPTACLES F0.R ELEC%RIC DISCHARGE TUBING. Terminals and receptacles for electric discharge tubing shall comply with the following; 1. TERMINALS. The terminals of the tubing shall be inaccessible to un- qualified persons and isolated from combustible material and grounded metal or shall be enclosed. If enclosed they shall be separated from grounded metal and combustible material by non - combustible, non- absorptive, insulating material approved for the purpose or by 1z inches of air. Terminals shall be relieved from stress by the independent support of the tubing. 2. `TUBE CONNECTIONS OIZLER THAN WITH RECEPTACLES. If tubes do not term- inate in receptacles designed for the purpose, all live parts of tube terminals and conductors shall be so supported as to maintain a separation of at least 11 inches between conductors or between conductors and any grounded metal. 3. RECEPTACLES, Electrode receptacles for the tubing shall be of non- combustible non - absorptive insulating material approved for the purpose. 4. RECEPTACLES AND BUSHING SEALS. A flexible, non- conducting seal may be used to close the opening between the tubing and the receptacle or bushing against the entrance of dust or moisture. This seal shall not be in contact with grounded conductive material and shall not be depended upon for the insulation of the tubing. 5. ENCLOSURES OF METAL. Metal enclosures for electrodes shall be of not less than No. 24 USS gauge (.0239 inch) sheet metal. 6. ENCLOSURES OF INSULATING MATERIAL. Enclosures of insulating material - 25 -