If you want to file it away -- this is the decision of the Supreme Court of Canada regarding voting by federal inmates.
http://www.lexum.umontreal.ca/csc-scc/en/pub/2002/vol3/html/2002scr3_0519.htmlSauvé v. Canada, a 5-4 decision of the Court.
We don't have "felons" in Canada. We have people who have been convicted of indictable offences, which are roughly equivalent to felonies in US states in most cases.
Criminal law is under federal jurisdiction, and where sentences are served depends on the length of a sentence.
Federal penitentiaries, much more "hard time" than provincial prisons, are for sentences of two years or more. That's why it's common for someone to be sentenced to "two years less a day" -- to keep them in the provincial prison system, and likely closer to home with the benefits of family/community contact.
The Canadian Charter of Rights and Freedoms (Part I of the Constitution Act, 1982) says:
1. The Canadian Charter of Rights and Freedoms guarantees the rights and freedoms set out in it subject only to such reasonable limits prescribed by law as can be demonstrably justified in a free and democratic society.
3. Every citizen of Canada has the right to vote in an election of members of the House of Commons or of a legislative assembly and to be qualified for membership therein.
15. (1) Every individual is equal before and under the law and has the right to the equal protection and equal benefit of the law without discrimination and, in particular, without discrimination based on race, national or ethnic origin, colour, religion, sex, age or mental or physical disability.
The Court held that the ban on voting by prisoners was, on its face, a violation of democratic rights and equality rights. The federal government attempted to justify the violation under section 1, and failed.
The Court's reasoning really is quite interesting and enlightening for someone who opposes disenfranchisement. The few paragraphs (the "headnote") at that site following the italicized identification of the issues and preceding the hyperlinks for cases cited by the Court contain a summary of both the majority and minority reasons.
There has never been a prohibition in Canada on voting by persons convicted of criminal offences who are not incarcerated at the time.
Inmates vote in their home constituencies. (Otherwise, the results in small communities where institutions are located could be skewed.)
http://www.elections.ca/eca/eim/article_search/article.asp?id=63&lang=e&frmPageSize=&textonly=falseTo vote in a federal electoral event, incarcerated electors must register by filling out an Application for Registration and Special Ballot, which is made available through each correctional institution. A staff member in the institution serves as a liaison officer and helps the electors register.
For electoral purposes, an inmate's address of ordinary residence is not the institution in which he or she is serving, but rather the first possible option from the following list: the inmate's residence before being incarcerated, the residence of a spouse or a relative, the place where the elector was arrested or the last court where he or she was convicted and sentenced. Votes are counted and applied in the electoral district of the address an inmate has identified, rather than the electoral district that includes the institution.