Street light electricians are to go on strike in a dispute over pay, terms and conditions.
The nine workers will take action outside the Olive Grove Road depot in Heeley from 6.30am on Monday December 1.
A Unite spokesman said that 18 months of negotiations had taken place after the former Sheffield Council staff were transferred to contractor Amey, which is managing the project to replace street lights across the city.
They had expected to reach a resolution this week but decided to walk out after it was dropped.
They say they are paid less than Amey electricians and want to keep the council terms and conditions rather than switching to new ones which would mean less holiday days, extra hours and no pay rise for two years if they have a disciplinary.
The spokesman, who would not be named, said: “We are talking much more inferior terms and conditions than the ones our members have fought for over several years.
“We are not going to flush those down the toilet for a bit more money.
“We thought we would get a deal and we heard this week that it would not happen, our members felt they had no option other than to take strike action.”
The spokesman said that the service would be disrupted and more strike action could happen in the future.