supply of supply of equipotential bonds for siemens make audio frequency track circuitof size 21.5 meter suitable for track circuit ftgs 46 /917. , supply of equipotential bonds for siemens make audio frequency track circuit of size 21.5 m eter suitable for track circuit ftgs 46 /917. terminal bond should be made of pvc coated wire rope of cross section approximately to 240 sq. mm. pvc coated wire should be as per is:2266 of 1978 or latest and pvc sheathing should be of compound type 6 as per is:5831 of 1970 with latest amendment if any. reclaimed o r recycled material shall not be used. brass lug should be brazed at both ends of equipotential bond and br ass terminal in centre of equi- potential bond as per sample and drawing. equipotential bonds are to be fixe d along the foot of rail and both ends of brass lug are to be riveted or fixed with nut bolts with web of rail b y copper rivets or nut -bolts after drilling holes. note-sample approval from consignee before bulk supply. [ warranty period: 30 months after the date of delivery ] ]