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37 6. Installation a. There are 3 or more rows of SGR-8961 extruded aluminum channels embedded in the background, 13" inches center to center running the full length of the sign area. b. The letters are to be attached to those channels using STD No. 33.10 snap -in clips furnished by the sign contractor. (Except for the letter I, all letters shall have a minimum of three clips, although more clips may be required, depending upon the size of the letter.) C. No letter attachment holes through the SGR-8961 channels and no welding to those= channels will be permitted. 7. Electrical Requirements a. Letters shall be internally illuminated with neon tubing, 15MM, or 13MM using 30 MA transformers for neon illuminated letters and 60 MA transformers for for Argon illuminated letters. b. The required transformers shall be mounted on the back side of. the fascia directly behind the letters and housed in a sheet metal box 7" X 7" X 18". The secondary wiring (GTO-15) running from the transformer to a letter will be contained in 1/2' Liquid tight flex conduit. That conduit shall be mechanically fastened to both the transformer box and the back to the letter track, by the use of: Appleton 1/2" Connectors, JIST-50 or Equal. No holes shall. be drilled in the SGR-8961 channel for any purpose except for running secondary wiring from the letter to the transformer. Those holes shall be 7/8 inches in diameter in order that, at a later date, they may be plugged with a standard snapi.n blank for 1/2 inch knock outs, Appleton ffS50 or equal. C. All wiring pertaining to the transformers, the SGR-8961 channels, and the letters shall be done in accordance with the latest edition Underwriters Laboratories Inc. Standards for Electric Signs and bear the required U.L. Labels. The use of P -K, or similar, neon electrode receptacles will not be permitted. d. No penetrations for attachments in the finished fascia surface will be permitted under any circumstances.