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CTA Project No. 19-0035-001-01 16450-3 Golden Shores Street Lighting <br />October 12, 2020 SIB Bid No. 20-09-01 <br />2. Below grade Connections: Install exothermic weld type connectors. <br />3. Remove paint, dirt, or other surface coverings at connection p oints to allow good <br />metal-to-metal contact. <br />4. Notify ENGINEER prior to backfilling ground connections. <br />B. Exothermic Weld Type: <br />1. Wire brush or file contact point to bare metal surface. <br />2. Use welding cartridges and molds in accordance with manufa cturer's <br />recommendations. <br />3. Avoid using badly worn molds. <br />4. Mold to be completely filled with metal when making welds. <br />5. After completed welds have cooled, brush slag from weld area and thoroughly <br />clean joint. <br />C. Mechanical Type: <br />1. Apply homogeneous blend of colloidal copper and rust and corrosion inhibitor <br />before making connection. <br />2. Install in accordance with connector manufacturer's recommendations. <br />3. Do not conceal mechanical connections. <br />3.05 METAL STRUCTURE GROUNDING <br />A. Ground metal sheathing and exposed metal vertical structural elements to grounding <br />system. <br />B. Bond electrical equipment supported by metal platforms to the platforms. <br />C. Provide electrical contact between metal frames and railings supporting pushbutton <br />stations, receptacles, and instrument cabinets, and raceways carrying circuits to these <br />devices. <br />3.06 MANHOLE AND HANDHOLE GROUNDING <br />A. Install one ground rod inside each. <br />B. Ground Rod Floor Protrusion: 4 to 6 inches above floor. <br />C. Make connections of groundin g conductors fully visible and accessible. <br />D. Connect all non current-carrying metal parts, and any metallic raceway grounding <br />bushings to ground rod with No. 6 AWG copper conductor. <br />3.07 SURGE PROTECTION EQUIPMENT GROUNDING <br />A. Connect surge arrestor ground terminals to equipment ground bus. <br />3.08 GROUNDING SYSTEM <br />A. Grounding Conductor: <br />1. Bury minimum 30” below finished grade. <br />2. Minimum 2 feet distance from foundation slabs.