TECHNOLOGY NEWS

Alarms should be installed inside the protected area, but not for external sirens and other devices that have been specially designed to work outside the protected zone. All devices outside the protected area must have adequate security. In addition, the wiring of such a system should be constructed in such a way as to sabotage or accidental disruption system was difficult or impossible. Every professional alarm system should have a minimum of two sounders for local alarm signaling. In particular, external sirens should be combined with a separate headquarters, regardless of short-circuit protected from acts of sabotage and other cables. Cables used should provide the proper level of insulation and durability over the long term operation. It is recommended to use cables cross section 0.5 mm2 for example, type YTKSY, YTYKZY, etc. You can also use multicore cables, commonly used in door entry installations, which cross-section is close to the 0.5 mm2. Every fire alarm system should be equipped with two independent power sources: primary and emergency. Every power source should provide full coverage alarm system in the energy and the correct operation of the devices. Usually the primary source of emergency power system is a network² of 230 energy, more specifically, the power supply DC power from thatnetwork. Rated voltage of power supply equipment for the vast majority of alarm systems is to build voltage constant 12V. In practice, however, a deviation of -15% and 25% of the rated value, which means that the alarms should have a supply voltage range from 10.2 V to 15V. Equipment alarm system must be resistant to mistaken reverse polarity power supply. Small changes in voltage and small changes in its frequency should not affect the operation of the alarm system devices. Switching power supply alarm system with the primary source of emergency (reserve) and vice versa must be done automatically and can not have any influence on the correctness of the work equipment and systems. Depending on the degree of threat and security of the building reserve power source should provide employment for a minimum of 12 to 72 hours. Not be replenished alarm devices incorporated in the alarm system with just one power source.