supply of a) 42 kv metal oxide gapless type 20 kv, b)10ka, class-iii metal oxide c) 198 kv, 10 ka metal gaplessa) 42 kv metal oxide gapless type 20 kv, b)10ka, class-iii metal oxide c) 198 kv, 10 ka metal gapless,42 kv metal oxide gapless type lightening arrestor (station class) as per rdso specification no. ti/spc/psi/mogtala/0101 (02/2015) or latest (as on date of tender opening). [ warranty period: 30 months after the date of delivery ] ] , 120 kv, 10ka, class-iii metal oxide, gapless type lightening arrestor as per rdso spec. no. e ti/psi/137(8/89) with a&c slip no - 1 to 7 with insulating base & surge monitor [ warranty period: 30 mon ths after the date of delivery ] ] , 198 kv, 10 ka metal gapless type lightening arrester as per rdso spec. no. eti/psi/137 (8/8 9) with a & c slipno. 1 to 7 [ warranty period: 30 months after the date of delivery ] ]