FIRE SAFETY ENGINEERING
The application of engineering principles, rules and expert judgements based on the scientific assessment of the combustion phenomenon, fire effects and human behaviour. They are aimed at the protection of human life, property and environment, the quantification of fire risks and their effects and the analytical assessment of the best fire-fighting measures to limit the risk of fire to predetermined levels .
FIRE SCENARIO A full and unambiguous description of the evolution of the fire in relation to its three basic aspects: fireside, activity and occupants.
ASET (available safe escape time) The time between the start of the fire ignition and the moment when the environmental conditions in the activity do not allow the occupants to reach or remain in a safe place.
RSET (required safe escape time) The time between the fire ignition and the moment when the occupants of the activity reach a safe place.
PTAT (pre-travel activity time) The time taken by the occupants for activities carried out before the evacuation