English to Russian Other Construction / Civil Engineering

The state of the monitored rolling grill is
constantly displayed visually. If the ''sales''
area is disarmed (burglar alarm system), a
countdown begins to run (time adjusted to
the situation of the building). Before this time
expires, all rolling grills which are located in
front of emergency exits must be in the
opened end position. That means that the
end switch or the magnetic contact or the
locking contact must be closed at the top.