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W-1.2 Electrical Conductivi� Each joint on cast iron pipe, val�es, hydrants or fittings, either "push-on" or mechanical joint type sha11 be electrically bonded with an external copper jumper capable of carrying 500 ampso af current for� an extended period of time to provide integral el�ctric thawing capabilities, These copper jumpers can be either shop or field applied in accordance with these specifications. For field applied copper jumpers, either the "Burndy- Thermoweld" as supplied by Burndy Corporation, Norwalk, Connecticut, or "Cadweld" by Erico Products Company, Cleveland, Ohi� will be permitted. Contractors or suppliers shall submit the method they propose to use for approval prior to construction. The copper jumper shall 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 shall be welded to the pipe and fittings by the metallic- arc welding process, if shop applied or by the exothermic welding process if field applied. I � �I� The copper jumper can be applied as a single sCrip welded at each end across the joint or by multiple strips with bolted connections in the middle. Silicon bronze bolts and ntits sha11 be used on all bolted connections. All welded connections shall be made on a clean metal surface which has been graund to remove coating and oxide. The area at the connection, including the wel.d, shall Ue refinished with its original coating or other suitable protective coatings specitied. The assembled copper jumper across the joints shall be so installed thaC � expansion, contraction, or relative pipe movement incidenta] to normal serviee use will not damage the connestion to such an ext�nt that electrical resist- ance will vary ac.�ss the joint. � � W-2 � The completed water main system shall be tesCed f�r electrical conductivity according to that st�ted elsewhere in these specific�tions. CONSTRUCTION REQUIRETiENTS W-2.1 Depth of Cut: The water main sha11 be pl�ced with minimum 8 feet of cover. Howev�er, �reater depth may Ue required at cerCain 1oc�Cians to clear existing sanitary sewer and sanirary sewer services. Accc�rdingly, the pipe will be laid to the depth s�bst�ntially as sho�.m on thc� plans. These adjustments may be required in the field, ��nd no unit of ineasurement or paym�nt shall apply for such vari��tiun. W-2 .2 Excava tion � A11 w•�rk sha 1 1 l�e d,�ne by open cut . ' W - 3