Protective systems must be designed and capable of being positional in such a way that explosions are prevented from spreading through dangerous chain reactions or flashover and incipient explosions do not become detonations.
Zaščitni sistemi morajo biti načrtovani in vgrajeni tako, da onemogočajo širjenje eksplozij prek nevarnih verižnih reakcij ali prebojnih vžigov in da razvijajoče se eksplozije ne prerastejo v detonacije.