In high-availability IT structures, standard measures include redundancies in air conditioning technology, uninterruptible power supplies, and regular maintenance without interrupting operations. An intelligent technical fire protection system can prevent fire hazards and ensure personal, environmental and property protection. Fire alarm systems using highly sensitive, false alarm-proof air sampling smoke detectors provide basic protection. If a serious situation occurs, a supplementary automatic nitrogen-gas extinguishing system can suffocate the fire efficiently and with no residue. Many data centre operators rely on free cooling to get their high energy costs under control. WAGNER offers individual fire protection solutions for this purpose, too—systems that not only provide maximum safety and security, but also ensure that there is no need to cut off power if a fire occurs.
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Malfunctions of these systems no response in case of danger, or alarm signal in case of no danger are undesirable and expensive. False alarms sent by emergency alarm systems result in expenses, which, in the industrial countries, amount to several hundred million Euros per year. Another aspect of malfunctions is the possible direct or indirect danger to human lives.
In this context, we may remember the malfunction of the fire alarm system in the tower of the Frankfurt Rhein-Main airport in , where a false activation of the fire extinguishing system occurred because of a lightning strike. Within a few minutes, the air traffic controllers had to leave the control room.
In this critical situation, approaching airplanes had to be redirected to other airports. Considerable delays occurred in the air traffic. All these factors cause unnecessary expenses. They can be avoided, when possible causes for false alarms are already recognised in the design stage and are eliminated by suitable preventive measures.
One of the measures also requested in the VdS guidelines is lightning and surge protection. A coordinated lightning and surge protection prevents a false alarm caused by atmospheric discharges and improves the availability of the early detection of dangers and alarms. When installing comparable alarm transmission systems, for which, out of financial reasons, a VdS approval is not used in residential building for example , the guidelines may also be used for project design and for the construction as well as for agreeing individual measures between constructors and operators.
However, a comprehensive protection against damage by lightning discharge and surges can only be achieved by external and internal lightning protection measures. Monitoring principles Different monitoring principles are applied for emergency alarm systems: Impulse line technology The information from the triggering alarm device is transferred in digital form. This allows recognition of the alarm device and the exact localisation of the trouble spot Fig.
DC line technology Each alarm line is permanently monitored according to the closedcircuit principle. If an alarm device is activated in the line, this line is interrupted and an alarm is triggered in the control and indication equipment.
Hereby, however, only the alarm line can be identified but not the individual detector. Regardless of the used monitoring principle, the lines of the emergency alarm system must be integrated into the lightning and surge protection of the complete system. It is chosen according to the voltage of the alarm lines, which is normally 12 or 24 V.
Regardless of the line topology, the outputs of the control and indication equipment, for acoustic and visual signalisation for example, should be protected by Blitzductor CT. Care should be taken to ensure the nominal current of the protective devices is not exceeded. The control and indication unit is normally connected to an exchange line of a fixed-network operator by means of a telephone dial unit. The surge protection of the power supply is important, too.
For alarm systems, which are certified by the German Insurance Association, systems recognised by VdS , the manufacturer of the alarm system should be contacted.
The installations as well as the lightning and surge protection equipment have to be set up in accordance with VdS , VdS or VdS Conclusion A distinct increase in the operational reliability of these systems can be reached with specific lightning and surge protection of alarm systems, including the prevention of false alarms when no danger exists, and the prevention of costs arising from this. This allows effective damage limitation by informing the auxiliary personnel reliably.
In the event of injuries to persons or environmental damage, the operator of a plant is liable first. This comprehensive responsibility for security can normally be expected from managers or executives of a company. However, in the legal sense, an operator of a plant is a technical layman, who is not able to assess the potential risk involved in a technical solution.
Therefore, skilled persons as suppliers of technical solutions must ensure in each individual case, the solutions offered correspond to the actual requirements. Regardless of the fact, whether fire alarm systems are VdS-approved systems or not, they should be furnished with a surge protection.
Primary power supply: Commonly the non-switched or volt alternating current source supplied from a commercial power utility. In non-residential applications, a branch circuit is dedicated to the fire alarm system and its constituents. Secondary backup power supplies: This component, commonly consisting of sealed lead-acid storage batteries or other emergency sources including generators, is used to supply energy in the event of a primary power failure. The batteries can be either inside the bottom of the panel or inside a separate battery box installed near the panel.
Neufassung VdS 2095 zu Planung und Einbau von automatischen Brandmeldeanlagen