procurement of 220kv and 66kv lightening arrestors. procurement of 220kv and 66kv lightening arrestors. total quantity as per nit. , 198 kv, 10 ka, single pole, station type heavy duty, class-iii, metal oxide (zinc oxide) gapless type lightning arrestors complete in all respects with insulating base suitable for 198 kv rating lightning arrestor, grading ring and surge monitor including discharge counters generally conforming to latest iec: 99.4 for 3 phase 50 c/s suitable for 220kv solidly grounded neutral system and compete with line terminal clamp, earthing terminal and base plate (minimum 8mm thick) for fixing lightning arrestors on structure with necessary hardware and pressure relief devices etc. grading ring of suitable capacity with technical specification as per annexure-‘a-i’ , 66 kv, 10 ka, single pole, station type heavy duty, class-iii, metal oxide (zinc oxide) gapless type lightning arrestors complete in all respects with insulating base suitable for 66kv rating lightning arrestors and surge monitor including discharge counters generally conforming to latest iec: 99.4 for 3 phase 50 c/s suitable for 66kv solidly grounded neutral system and complete with line terminal clamp, earthing terminal and base plate (minimum 8mm thick) for fixing lightning arrestors on structure with necessary hardware and pressure relief devices etc.technical specificationsas perannexure-‘a-iii’.