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a mixed load of incandescent lights and transformers the load shall not <br />exceed fifteen (15) amperes. <br />5. Enclosures for transformers, tube terminals or any devices when not <br />in sign shall be No. 20 U.S, sheet metal gauge or equivalent (.0375 inch). <br />Enclosures for outside use shall be made weatherproof. <br />\ (C) GROUNDING. Transformer frames, motor generator, rotary converter frames, <br />metal sign frame and each section of a multiple section sign and other equipment <br />conduit for both high and low tension wiring, transformer terminals intended to <br />be grounded, and isolated sections of conduit shall be permanently and effect- <br />ively grounded. <br />(D) GAS TUBING. <br />1. The tubing shall be of such a length and design as not to cause a <br />continuous over - voltage on the transformers. <br />2. The supports for the tubing shall be of the insulated type of non- <br />absorptive incombustible material and preferably adjustable. They shall <br />maintain the tubing not less than k inch from metal parts and this spacing <br />shall be maintained where the tubing passes through metal barriers. Tube <br />terminals shall comply with one of the following; <br />(a) SKELETON GLASS LETTER SIGN AND OUTLINE BORDERS. When the <br />electrodes are in a vertical position, they shall be covered by a <br />glass shield where socket receptacles are not used. When electrodes <br />are in a horizontal position glass tubing may be used to enclose the <br />terminals. The distance between terminals in either case shall not <br />exceed 1J inches. Sleeves covering terminals shall extend not less <br />than 1z inches beyond nearest live part. Where gas tube cable leaves <br />the conduit electric metallic tubing or other metal enclosure not <br />more than six (6) inches of cable shall be exposed. <br />(b) TUBE TERMINALS ENTERING A BOX, TROUGH OR OTHER ENCLOSURE, <br />- 15 - <br />