Ancestry have added Norfolk Electoral Registers to collections
Ancestry have added Norfolk, England, Register of Electors, 1813-1952 to their collections.
These are same records that are already on FamilySearch which are free to search. and can be found under England, Norfolk Register of Electors, 1832-1915
The FamilySearch collection indicates the dates are between 1832 and 1915, not the dates quoted by Ancestry.