Eugene McGlone Eugene McGlone said there was widespread support for strike action
Senior members of the Irish Congress of Trade Unions (ICTU) are to meet in Belfast later to discuss a public sector strike on 30 November.
Two more teaching unions in Northern Ireland have voted to strike.
The National Association of Head Teachers and the Irish National Teachers Organisation cited pension concerns and education budget cuts.
ICTU president Eugene McGlone said there was widespread support for strike action.
"All the unions that have balloted thus far have had very positive results and indicated that they are taking industrial action," he said.
"They have given the 'yes' vote for industrial action, from senior civil servants all the way down the line. There will be a massive reaction on the 30th."
The National Association of Head Teachers (NAHT) said more than half its members voted and almost 67% backed a strike.
The Irish National Teachers Organisation (INTO) said 88% of those who voted backed strike action.
It is the first time in its history that the NAHT, has voted to strike.
It has 800 members in Northern Ireland - principals and vice-principals.
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