Dear Monu
Encashment of leave :-
Mostly depends on company policy & certified standing orders 's provisions . So Please check your company's HR policy ,
It may be limit prescribed for encashment in rules of CO. In earlier post Mr TU has suggested the way how earned leave can be credited in individuals accounts , but the encashment issue is the another thing.
In most of the company after a certain limit , EL / CL are being lapsed if the concerned workmen or person have not availed this.