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_ 11. UFER Ground; Fabricate with 20 feet of conductor laid lengthwise in exca ation for <br /> foundation or footings. Install so conductor is within 2 inches of the bottom of th concrete. <br /> Where base of foundation is less than 20 feet in lengt6, coil excess conductor base of <br /> foundation. Bond conductor to reinforcing steel at four locations,minimum. Extend nductor <br /> below grade and connect to building grounding grid, grounding electrode con uctor, or <br /> grounding electrode. <br /> 12. Connections: Make connections in such a manner as to minimize possibility of galv ic action <br /> or electrolysis. Select connectors, connection hardware, conductors, and connectio methods <br /> so metals in direct contact will be galvanically compatible. <br /> a. Use electroplated or hot-tin-coated materials to assure high conductivity and m e points <br /> of contact closer in order of�lvanic series. <br /> b. Make connections with clean bare metal at points of contact <br /> c. Aluminum to steel connections shall be with stainless steel separators and m chaaical <br /> clamps. <br /> d• A1���m to 8alvanized steel connections sha11 be with tin-plated copper j rs and <br /> mechanical clamps. � <br /> e. Coat and seal connections involving dissimilaz metals with inert material su as red <br /> lead paint to prevent penetiration of moisture to contact surfaces. <br /> 13. Exothermic Welded Connections: Use for connections to stiuctural steel and for und rground <br /> . connections except those at test wells. Install at connections to ground rods d plate <br /> � electrodes. Comply with manufacture�s written recommendations. Welds that are p ffed up <br /> , or that show convex surfaces indicatiag improper cleaaing are not acceptable. <br /> 14. Tighten grounding and bonding connectors and terminals, including screws and lts, in <br /> accordance with manufacture�'s published torque dghtening values for connectors bolts. <br /> Where manufacturer's torquing requi��ents are not indicated, tightett connections to comply � <br /> with tightening torque values specified ia LTI,4g6A and UL 486B. <br /> 15. Compression-Type Conne�tions: Use hydraulic compression tools to provide the correct <br /> circumferential pressure for compression connectors, LTse tools and dies recommende by the <br /> manufacturer of the connectors, provide embossing die code or other standard method make <br /> a visible indication that a connector has been adequately compressed on the conductor. <br /> 16. Moishue Protection: Where insulated conductors are connected to ground rods or ouad <br /> buses, insulate the entire area of the connection and seal against moisture penetration of the <br /> insulation and cable. <br /> 17. Tests: Subject the completed grounding system to a megger test at each location ere a <br /> ma�cimum gruund resisrtance level is specified,at service disconnect enclosure ground te inal, <br /> aad at ground test wells. Measure ground resistance without the soil being moistened y any <br /> means other than natural precipitation or natural drainage or seepage and without ch mical <br /> treatrnent or other artificial means of reducing natural ground resistance. Perform tests y the <br /> CNS/US WEST COMMiJNICATTONS GRO ING <br /> SMMA NO.96419.16 16452-4 17 D C.% <br />