Police civilians are preparing to walk out for 24 hours in a dispute over pay.
The union Unison balloted members who voted for strike action towards the end of last year.
Workers were due to walk out in a national strike on Monday, December 22 but suspended the action to allow further negotiations between union and police chiefs.
Unison said members would stage 24-hour strike starting at 7am on Friday, January 23 unless a pay deal can be reached with employers.
It will be followed by a month of action short of a further strike.
Unison members include 999 call handlers, police community support officers, scenes of crime officers, fingerprint experts, financial investigators and detention officers.
The union’s national officer, Ben Priestley, said: “Industrial action is a last resort and the initial talks with the employers were encouraging.
“We are hopeful that we can resolve the dispute and avoid any disruption.
“The rules around industrial action mean we have had to call another strike day to ensure we are still able to take strike action should the talks break down.”