(1) The giving of a notice or other document to a person for the purposes of proceedings under this Act may be effected by delivering it to the person or by sending a copy of it by registered prepaid post in an envelope addressed to the person at the person's last known residence or place of business.

(2) In the case of a company to which the Companies Act, 1963, applies, such a document may be given by delivering it, or sending a copy of it by registered prepaid post in an envelope addressed to the company at its registered office.

(3) In the case of a body corporate to which subsection (2) does not apply or an unincorporated body of persons, such a document may be given by sending a copy of it to the body at any place in the State where it carries on business or in such other manner as an originating summons may be served on the body under rules of court.

(4) A rights commissioner may, if he or she considers it reasonable to do so having regard to all the circumstances, extend by a specified period (not exceeding 6 weeks) the period of time within which a notice under this Act (other than section 19(2)) is required to be given.

(5) The Tribunal may, if it considers it reasonable to do so having regard to all the circumstances, extend by a specified period the time within which a notice under section 19(2) is required to be given.

(6) Time may be extended under subsection (4) or (5) after the expiration of the period of time concerned.