This will be on Friday between midday and 5pm, on Saturday, May 3 from 2pm until 2am on Sunday morning and on Sunday, May 4 between 10am and 3pm.
The Royal Berkshire Fire and Rescue Service (RBFRS) has contingency arrangements in place to provide a level of cover due these times.
Chief fire officer Any Fry is urging people to take extra care.
He said: “As with previous periods of strike action, we will still be answering and responding to 999 calls, although we will be prioritising ‘life critical’ incidents, such as house fires and road traffic collisions where people are trapped.
“There are lots of simple steps you can take to help keep yourself and your family safe.
“We are also asking people to reduce demand during the strike period by only calling 999 in a genuine emergency."
Advice includes ensuring that you have a smoke alarm fitted in every level of your home and testing the batteries.
People are also advised to take extra care when cooking, which also applies to barbecues, and to be careful as not to overload electrical sockets.
Visit rbfrs.co.uk for more details.
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