Section 21(3) in The Representation Of The People Act, 1950
(3)Notwithstanding anything contained in sub-section (2), the Election Commission may at any time, for reasons to be recorded, direct a special revision of the electoral roll for any constituency or part of a constituency in such manner as it may think fit:Provided that subject to the other provisions of this Act, the electoral roll for the constituency, as in force at the time of the issue of any such direction, shall continue to be in force until the completion of the special revision so directed.
