Staff at John Hunter and Morisset hospitals will stop work for an hour on Wednesday to urge the Minns government to boost wages.
The Health Services Union said every hospital in the state will have "various work bans and other actions".
The industrial action will occur from 10am in windows of four hours, with workers stopping for an hour at a time.
The workers involved include paramedics, radiographers and staff in wards, security, catering, cleaning, allied health and administration.
"Everyone apart from doctors and nurses," a union official said.
The workers are ramping up their industrial action, after a promised pay hike failed to materialise two months after Labor won power.
Scrapping the 3 per cent public sector wage cap was a key promise of Labor's election campaign and unions are disappointed with the lack of progress.
The Health Services Union said patient safety won't be affected when workers walk off the job on Wednesday.
Union boss Gerard Hayes is "bitterly disappointed" with the lack of action from the government in the face of the rising cost of living and says frustrated workers are prepared to escalate action to get a pay increase.
"There is still a lot of talk and not a lot of action," he told AAP on Monday.
The union is calling for a 6 per cent pay rise, plus 0.5 per cent for super, noting pay increases had not kept pace with inflation.
"This comes on the back of two years ago, the union got a 0.3 per cent increase," Mr Hayes said.
"So people were struggling then. But now we are seeing inflation at 7 per cent. It was nowhere near that before," he said.
"We are seeing people's rents ratcheting up by 30 to 50 per cent. We are hearing that people are rationing food. This should be an absolute priority for a government."
Higher wages were vital to retain workers who were leaving the industry and going elsewhere.
My Hayes said the industrial action will only increase, with the union holding its annual conference in July.
Premier Chris Minns says negotiations are underway, but there won't be any legislation introduced into parliament this week to lift the wages cap.
"I'm very happy with the progress of those talks," he told reporters on Monday.
"The vast majority of unions have been sitting down and talking with us about the next stages, and hopefully we can say something about that soon.
"But anything we can do, obviously, to advance negotiations and prevent industrial action, that's what we want," he said.
Members of the NSW Australian Paramedics Association voted on Friday to continue their week-long ban on staff movements, despite the government seeking legal action to stop it.
Acting secretary Brendan McIlveen said paramedics had been leaving in droves for the past three years due to low wages.
"We can't sit around hoping for these critical issues to be addressed, and we won't be bullied out of fighting for them."
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