Fire crews extinguished a fire inside a small, electrical building at the Kurnell Caltex refinery this morning.
Emergency services were called to the area at 3.45am after Caltex activated its emergency alarm.
A company spokesman said Caltex and Fire and Rescue NSW contained the fire to a cabinet in the building.
Employees were able to return to work at 5.30am.
No one was injured.
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