The Psychiatric Nurses' Association has confirmed that members will withdraw what they call "goodwill" work practices in protest at proposed cuts in the Croke Park II proposals.
From 19 March, psychiatric nurses will refuse to use their personal mobile phones or cars for work purposes.
They will also adhere strictly to their rosters, refusing to swap days to facilitate covering staff shortages due to the Government moratorium on recruitment.
The decision was taken at a meeting of the PNA National Executive Committee today.
PNA Deputy General Secretary Seamus Murphy said that management had come to take such "goodwill" practices for granted.
He said that by withdrawing them, psychiatric nurses were showing that they were not prepared to accept what he called the "regressive" and "draconian" proposals of Croke Park II.
He said today's announcement was in addition to steps being taken in a joint campaign by the 24/7 Frontline Alliance to oppose the new pay proposals.
The PNA's annual conference is due to commence on 18 April - the day after Congress announces the final outcome of the ballot by public service unions.
The union will discuss the outcome of the vote and its response at the conference, including if necessary a ballot for industrial action.