2.1 Design scenario (BE)
Design scenario in brief
2.1.1 Design scenario description
For each room/space within the building, assume that the fire source is located near the primary evacuation route and that it prevents occupants from leaving the building by that route. Fire in evacuation routes can be the result of an accidental or deliberately lit fire.
In order to be regarded as alternative evacuation routes, the evacuation routes must be separated from each other and must remain separated until reaching a final exit in accordance with D1.5, or as demonstrated equivalent through analysis.
Active and passive fire safety systems in the building must be assumed to perform as intended by the design.
Fire characteristics (e.g. HRR) and analysis need not be considered in this design scenario as the fire is assumed to physically block the evacuation route. It may be assumed that occupant tenability criteria cannot be met where fire plumes and flames block an evacuation route.