dry ash system package with electrical and c n i interface for stage i 4 x 210 mw kahalgaon stps for ntpc , supply: , design, engineering supply of balnce ahp retrofit works as per specification except a.2, a.3, a.4 , detail engineering & supply of ac and ventilation system for ash handling system , lt onan 1000kva 11 / 0.433 kv ash handling transformer , lt onan 1600kva 11 / 0.433 kv ash handling transformer , e&c , e&c of complete dry ash system package with electrical and c&i interface as per specification , mandatory spares , supply of mechanicalmandatory spares of ahp retrofit works as per specification , supply of electrical and c&i mandatory spares of ahp retrofit works as per specification , freight on supply ( sl no1 ) & mandatory spares ( sl no 3 )