Not sure what you mean by 'a Section 4'. Section 4 of the PDA 2000 refers to exempted development. Was this what you meant?
If you go to http://www.irishstatutebook.ie
and look for No. 30 of 2000 (The Planning and Development Act) it will give the full text of the Act, including Section 4.
If it was something else, maybe give a bit more detail here so we can answer accurately.