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303.800 JOINTING AND ELECTRICAL CONDUCTMTY Before laying the pipes, the outside ofthe spigot and the inside of the bell shall be wire brushed and wiped clean and dry. Pipe ends-shall be kept clean until joints are made. . AU jointing of mechanical joint pipe and push-on pipe-shall be in accordance with the requirements of the AW.W.A Standard C600. Ductile iron pipe shall be cut only by sawing, milling or torch cutting in accordance with the manufacturer's recommendations, provided the cut joint is properly ground. Each joint on ductile iron pipe, valves, wet taps, hydrants or fittings, either "push-on" or mechanical joint type SI1all be electrically bonded with an extended period of time to provide integral electri(; thawing capabilities. These copper jumpers can be either shop or field applied in accordance with these specifications. For field applied copper jumpers, either the "Bumdy-Thennoweld", as . supplied by Bumdy Corporation, Norwalk, Connecticut, or "Caldweld", by Erico Products Company, Cleveland, Ohio will be permitted. CONTRACTORS or suppliers shall submit the method they propose to use for approval prior to construction. The copper jumper sha!l be a minimum 1/16" X 1/2" wide flat strip or equal cross section round copper wire in the annealed condition conforming to ASTM Specification B152-58 Type DHP. _ All copper jumpers sh~l be welded to the pipe and fittings by the metallic-arc welding process, if shop applie< or by the exothermic welding process if field applied. The copper jumper can; be applied as a single strip welded at each end across the joint or by multiple strips with bolted connections in the middle. Silicon bronze bolts and nuts shall be used on all bolted connections. All welded connections shall be made on a clean metal surface which has been ground to remove coating and oxide. The area at the connection, including the weld, shall be refinished with its original coating or other suitable protective coatings specified. The assembled copper jumper across the joints shall be so installed that expansion, contraction, or relative :pipe movement incidental to normal service use will not damage the connection to such an extent that electrical resistance will vary -across the joint. The completed watermain system shall be tested for electrical conductivity according to that sfated in testing in ~hese specifications. ! 303.900 INSULATION 300-14 ,