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MULTI-PURPOSE SOUND SYSTEM Section 16780 15-1207 welded. Operating panel mounting considerations shall be the same as those for recessed panels. 6. All contractor fabricated printed circuit boards shall be at least 1/16" thick G-10 glass fabric epoxy base, copper plated to a minimum density of 2.0 oz/sq. ft. on one or both sides, and finished with 60/40 tin led solder either hot rolled or plated over the copper. All holes through the boards shall be plated through and solder filled, or wire jumpers installed and soldered on both sides. All boards shall be permanently identified with a designation that matches that of the mating connector or board position in the assembly. 7. All printed circuit boards shall be mechanically secured by bolt or friction -loading guide, in addition to any electrical connector attachment, and shall include an integral extraction grip. 8. Printed circuit boards shall be connected to associated circuitry via soldered connections, precious metal positively keyed card edge connectors, or captive type screw connectors, or positive locking pin connectors. K. Identification: Provide permanent intelligible identification on, or adjacent to, all controls, fuses, circuit breakers, patching jacks, connectors, receptacles and the like. This identification shall clearly and distinctly indicate the function of the item and shall be numbered or lettered to correspond with the function, circuit and location consistent with field and shop drawings. 1. Identification of fuses and circuit breakers shall indicate protected circuitry, rating of protective device and voltage across open circuited protected device. 2. Panel surfaces shall be engraved and filled or silk screened with identification, or shall be equipped with 1/8" thick laminated plastic labels with engraved characters at least 1/8" high (white characters on black background) fastened to the equipment by screws or rivets. Under no conditions will embossed plastic labels or dry transfer lettering be considered acceptable. Coordinate engraving colors and sizes with the Architect. 3. Each principal element of the system shall be completely wired internally with consistently identified terminal strips provided for all appropriate connections. These designations shall be shown on all related drawings and documentation. L. Finishes: 1. All steel surfaces shall be treated with an appropriate primer and finish painted with enamel paint. 2. All aluminum surfaces except those used as operating surfaces, shall be anodized or treated with an appropriate primer and finish painted with a thermosetting epoxy paint. 3. Finish colors shall be as indicated in Contract Documents or as approved by the Owner. 2.2 SPEAKERS A. Speech intelligibility shall be the primary goal during sporting events. The spectators' bleacher speakers shall be aimed and tuned to reduce unwanted reflections and echoes from the walls and floor. A single speaker array element shall be provided at each location 11