Dublin Fire Brigade union members are set to conduct two 24-hour stoppages in the next few weeks.
SIPTU members are highlighting their opposition to an attempt to break up the DFB Emergency Medical Service by removing its ambulance call and dispatch function.
The work stoppages, planned for Saturday, March 18 and Monday, March 27, will both commence at 9am.
The announcement about the work stoppages was made at a rally outside City Hall in Dublin this evening.
Over 200 SIPTU Dublin Fire Brigade firefighters and their supporters rallied in Dublin's city centre.
Traffic to Castle Street was closed as a result.
"It is with deep regret that SIPTU members in Dublin Fire Brigade have been forced into conducting these work stoppages," SIPTU Sector Organiser Brendan O’Brien said.
"These firefighters are withdrawing their labour to indicate, in the strongest manner open to them, their complete opposition to an attempt by senior management in Dublin City Council to break up the DFB Emergency Medical Service by removing its ambulance call and dispatch function.
"Removal of this function breaks a key link in the DFB Emergency Medical Service chain, which would result in a reduction in the effectiveness of the service, response time delays and expose the public to increased risk."
Union members voted by 93pc to 7pc in favour of strike action and 97pc to 3pc in favour of industrial action in a recent ballot.