Light-and-sound fire alarms are used in fire alarm and fire extinguishing systems in explosive zones of 1 and 2 classes of enclosed facilities and open installations, as well as in underground mines, mines and their ground structures
Light-and-sound fire alarms are used in fire alarm and fire extinguishing systems in explosive zones of 1 and 2 classes of enclosed facilities and open installations, as well as in underground mines, mines and their ground structures