Nearly every job (except nursing) that requires a work permit has to be advertised in Ireland under the Labour Market Needs test. There is no legal requirement that Nursing jobs have to be advertised in Ireland/EU. The Labour Market Needs test does not apply to Irish Nursing jobs. I think all nursing jobs should have to be advertised in Ireland and comply with Labour Market Needs Test. The Department of Jobs, Enterprise and Innovation website is my source for this information.
http://www.djei.ie/labour/workpermits/nurses.htm