The DIBt building rules list requires proof of applicability for fire protection closures (a German technical approval from the building authority or a European technical approval). These approvals stipulate a hold-open system to keep the systems open during operation. The hold-open system must be suited for this task. It applicability must be verified by means of a technical approval.
Proof of usability
Z-6.5-1990 for conveyor system closures
Fire alarm analysis
Push-button • Potential-free contact of fire alarm centre • Via fire alarm loop or smoke switch
Degree of protection