Firefighters in West Yorkshire are to strike for 24 hours from 9am in the latest stoppage in a dispute over pensions.
It will be the 48th stoppage since the dispute began in September 2013.
Firefighters will return to work at 9am on Wednesday – but then launch an indefinite period of industrial action, short of a strike.
Fire cover at West Yorkshire fire stations will again be provided by community response operatives under the supervision of a senior fire officer.
The Fire Brigades Union launched the action in response to plans for a new pension scheme proposed for next April which will mean firefighters having to work longer until retirement age.
West Yorkshire Fire Service has urged the public to take extra care during the next 24 hours.
Safety tips include: checking smoke alarms; switching off Christmas tree lights before going to bed or leaving the house; always using a power breaker for outside tools or equipment; never cooking while under the influence of alcohol; not leaving pans unattended; and not smoking in bed.