supply of supply of s- bonds of size 11 meter long for siemens make audio frequen-cy track circuits (ftgs 917-917). , supply of s- bonds of size 11 meter long for siemens make audio frequen-cy track circuits ( ftgs 917-917). bond should be made of pvc coated wirerope of cross section approximately 240 sq. mm. pvc coated wire should be as per is:2266 of 1978 and pvc sheathing should be of compound type 6 as per is:5831 of 1970 with latest amendment if any. reclaimed or recycled material shall not be used. brass lug should be brazed at both end of s bond and brassterminal in centre of s bond as per sample and drawing. s bonds are to be fixed along the foot of rail in form of s and both ends of bracing are to be riveted with web of rail by copper rivets after drilling holes. note-sample approval from consignee before bulk supply. [ war ranty period: 30 months after the date of delivery ] ]