No building is fire proof. Fire can happen anywhere, even a small one spreads fast within few minutes to become a full fledged emergency scenario which may burn the whole building. Although companies have put fire prevention practices in place such as availability of fire extinguishers, installation of water sprinklers and hydrant system. But without proper training for its use and proper maintenance, they will be of no use at all.
Fire extinguishers are meant for initial stage of fire or small fires. It means a fire can only be controlled successfully if a trained person is available near the seat of a fire incident. We should also have a small fire extinguisher (Multipurpose powder- ABC type) at our homes for our own safety.
Evacuation from a building on fire and in case of an earthquake warrants a different evacuation response. You may be told by your ERT (Emergency Team members) to stay inside the building as earthquake shakes the building but you may be told to evacuate the building through a staircase in case of a fire emergency.
Companies conduct mock drills to check and evaluate the response of its employees , note down the unsafe behaviors to be corrected in time prior to an actual emergency.