This European Standard specifies requirements for separate hold-open devices and also for hold-open mechanisms incorporated in a door closer !intended to be used on fire/smoke compartmentation doors". Electrically powered hold-open devices for swing doors manufactured according to this European Standard can hold a swing door at a fixed position or can allow the door to swing freely. In each case interruption of the electrical supply will cause the controlled door to close positively.Electrically powered hold-open devices manufactured in accordance with this European Standard are recommended for use wherever there is a requirement for reliable hold-open and
EN 1155:1997 history
1997EN 1155:1997 Building hardware - Electrically powered hold-open devices for swing doors - Requirements and test methods