Specifications - City of Montpelier, Vermont

Title:16450 $ GroundingMontpelier District HeatingCity of Montpelier, VTIssue Date:September 28, 2012Page #:6 of 6conductors, and connection methods so metals in direct contact will begalvanically compatible.B. Use electroplated or hottincoated materials to assure high conductivity and makecontact points closer in order of galvanic series.C. Make connections with clean bare metal at points of contact.D. Aluminum to steel connections shall be with stainless steel separators andmechanical clamps.E. Aluminum to galvanized steel connections shall be with tinplated copper jumpersand mechanical clamps.F. Coat and seal connections involving dissimilar metals with antioxidationcompound to prevent future penetration of moisture to contact surfaces.G. Exothermic Welded Connections: Use for connections to structural steel and forunderground connections except those at test wells. Install at connections toground rods and plate electrodes. Comply with manufacturer's writtenrecommendations. Welds that are puffed up or that show convex surfacesindicating improper cleaning are not acceptable.H. Terminate insulated equipment grounding conductors for feeders and branchcircuits with pressuretype grounding lugs. Where metallic raceways terminate atmetallic housings without mechanical and electrical connection to the housing,terminate each conduit with a grounding bushing. Connect grounding bushingswith a bare grounding conductor to the ground bus in the housing. Bondelectrically noncontinuous conduits at both entrances and exits with groundingbushings and bare grounding conductors.I. CompressionType Connections: Use hydraulic compression tools to provide thecorrect circumferential pressure for compression connectors. Use tools and diesrecommended by the manufacturer of the connectors. Provide embossing diecode or other standard method to make a visible indication that a connector hasbeen adequately compressed on the ground conductor.END OF SECTION 16450GROUNDING164506