ACT Fire & Rescue (ACTF&R) have responded to an electrical smell in Belconnen.
Crews were alerted to the incident at a building on Chandler Street by automatic alarms just after 12:32pm.
Firefighters used thermal imaging to trace the source of the smell to a burnt out pump in the sprinkler valve room.
Around 50 people have been evacuated by ACTF&R as a precaution.
Atmospheric monitoring will take place shortly and when all clear occupants will be allowed to return to the building.
Three pumpers, Breathing Apparatus support van, Bronto, HAZMAT and Commander have responded.