Specifications - City of Montpelier, Vermont

Title:16450 $ GroundingMontpelier District HeatingCity of Montpelier, VTIssue Date:September 28, 2012Page #:5 of 63.2 INSTALLATIONA. General: Ground electrical systems and equipment in accordance with NECrequirements except where the Drawings or Specifications exceed NECrequirements.B. Ground Rods: Drive rods until tops are 6 inches below finished floor or finalgrade except as otherwise indicated. When more than one rod is required perNEC, locate a minimum of onerod length from each other and at least the samedistance from any other grounding electrode. Interconnect ground rods with bareconductors buried at least 24 inches below grade. Connect barecable groundconductors to ground rods by means of exothermic welds except as otherwiseindicated. Make these connections without damaging the copper coating orexposing the steel.C. Metallic Water Service Pipe: Provide insulated copper ground conductors, sizedas indicated, in conduit from the building main service equipment, or the groundbus, to main metallic water service entrances to the building. Connect groundconductors to the main metallic water service pipes by means of ground clamps.Where a dielectric main water fitting is installed, connect the ground conductor tothe street side of the fitting. Do not install a grounding jumper around dielectricfittings. Bond the ground conductor conduit to the conductor at each end.D. BraidedType Bonding Jumpers: Install to connect ground clamps on water meterpiping to bypass water meters electrically. Use elsewhere for flexible bondingand grounding connections.E. Route grounding conductors along the shortest and straightest paths possiblewithout obstructing access or placing conductors where they may be subjected tostrain, impact, or damage, except as indicated.F. Bond interior metal piping systems and metal air ducts to equipment groundconductors of pumps, fans, electric heaters, and air cleaners serving individualsystems.3.3 CONNECTIONSA. General: Make connections in such a manner as to minimize possibility ofgalvanic action or electrolysis. Select connectors, connection hardware,GROUNDING164505