What do you announce over the intercom during a fire drill?

Most places make no announcement over intercom pr public address systems during a fire drill. They sound the evacuation alarm (usually a bell, horn or klaxon) and people evacuate the building, just as if it were a real fire. An intercom or PA announcement may be made when the all clear is given and people reenter the building. That announcement might be something like, "This has been a drill, Thank you for your cooperation."

If the intercom is the only way to alert people to the need to evacuate, then an announcement that the building is to be evacuated should be made. To make the drill most effective, it should be the same announcement that would be used in a real fire, and should not include the information that "this is a drill." So it might be something like "Attention! Attention! Please walk quickly and calmly to your nearest exit and evacuate the building."

If you tell people it is a drill, some will ignore it and not evacuate - and that reduces the effectiveness of the drill.