Security requires protection

April 2015 IT infrastructure

Security, stability and order are basic needs. In a world of increasingly complex processes sophisticated technical equipment is required to satisfy these basic needs. In this context, both structural and technical measures, such as CCTV systems, are decisive to increase the security in buildings and facilities.

Failure-free operation of these systems is particularly vital in dangerous and extreme situations to ensure that the required information is transferred and the relevant actions are initiated. False alarms may cause unnecessary costs and make the alarmed group of persons used to alarms so that real alarms may no longer be taken seriously. This could have fatal consequences.

False alarms resulting from technical problems can have different causes. One possible cause is electromagnetic interference with the monitoring systems. During a thunderstorm, a particularly dangerous combination of circumstances occurs: On the one hand, there is always an increased risk of fire resulting from the thermal effect of a lightning strike. On the other hand, a lightning discharge is a strong source of electromagnetic interference, which may interfere with the security systems due to conducted interferences and the electromagnetic field. This leads to failure or destruction of the security systems, which are then no longer able to indicate a dangerous situation. Therefore, lightning and surge protection measures are required to ensure safe operation of such systems.

CCTV systems are used to monitor public and private rooms, traffic flows and technical systems. In industrial plants, they are vital to ensure safe and efficient operating procedures. Installed in an outdoor location, CCTV cameras are often vulnerable to direct lightning strikes due to their exposed location. This danger can be avoided by adequately arranging the cameras at the outer walls of buildings or installing lightning protection systems for the cameras.

The lightning protection standards of the IEC 62305 series form the basis for planning and implementing lightning protection measures. The protection goal of the two protection measures mentioned before is to prevent a direct lightning strike to the camera to be protected by an adequate arrangement of air-termination systems. When dimensioning the down conductors for the external lightning protection system of the camera, a sufficiently large separation distance must be maintained between the down conductor of the lightning protection system and the CCTV camera including its supply lines to prevent flashover between the down conductor and the CCTV camera.

The minimum value of the separation distance to be maintained can be calculated based on the calculation scheme provided in the IEC 62305-3 standard. If, for example, CCTV cameras have to be installed on an isolated camera mast to be able to seamlessly monitor an object or an installation, it is often difficult to maintain the separation distance between the CCTV camera and the installations of the external lightning protection system. But there are also practice-proven solutions for this case such as high-voltage-resistance, insulated conductors. No separation distance must be maintained between the CCTV camera and the down conductor if these special conductors are used.

CCTV cameras are typically installed on masts at the periphery of large objects and installations. The resulting larger cable lengths between the central monitoring system and the camera masts are targets for the electromagnetic field of the lightning discharge which may induce impulse-shaped and temporary high voltages in the lines of the CCTV system. These voltages may interfere with or even destroy the CCTV cameras. To prevent this situation, surge protective devices for protecting the supply voltage and the video signal of the camera should be used.

Specific lightning and surge protection measures for security systems such as CCTV systems avoid false alarms in case of uncritical situations and the resulting costs, thus considerably increasing the operational reliability of these systems. Only if all technical boundary conditions are observed, trouble-free operation of security systems and thus the necessary information transfer is ensured.

For more information contact Dehn Protection South Africa, +27 (0)11 704 1487, alexis.barwise@dehn-africa.com, www.dehn-africa.com


Credit(s)




Share this article:
Share via emailShare via LinkedInPrint this page



Further reading:

Double dose of storage security
August 2019 , Products, IT infrastructure
The integration of InfiniBox and SafeNet KeySecure platforms brings data-at-rest encryption together with centralised logging, auditing capability.

Read more...
How far are we really at with artificial intelligence?
August 2019, Axis Communications SA , Editor's Choice, CCTV, Surveillance & Remote Monitoring, IT infrastructure, Residential Estate (Industry)
Justin Ludik unpacks exactly how far AI has come and what it potentially can do for society and more importantly, surveillance.

Read more...
Insuring thatched roofs against lightning
August 2019, DEHN Africa , Security Services & Risk Management
Considering South Africa’s very high lightning flash density statistics, and the popular trend all over the country to use aesthetically pleasing thatched roofs for residential as well as commercial buildings, a fit-for-purpose offering has been introduced by DEHN Africa.

Read more...
Collaboration and tech key to safer, connected communities
August 2019 , Residential Estate (Industry), IT infrastructure
The advent of fibre-to-the-home has not only changed the way we work and play but has also heralded the launch of a number of advances for the security industry.

Read more...
Cyber tools and solutions
August 2019, Technews Publishing , Editor's Choice, Cyber Security, IT infrastructure, Residential Estate (Industry)
Hi-Tech Security Solutions looks at the various options we have when it comes to protecting yourself from the ever-growing scourge of cybercrime?

Read more...
Security solution for SD WAN
August 2019 , IT infrastructure
As thousands of African companies start to investigate and/or deploy SD WAN solutions, one consistent question arises: what are the security implications?

Read more...
Cloud advantage or cost?
August 2019 , Cyber Security, IT infrastructure
No matter how you look at it, security in the cloud is as important as security in traditional data centres.

Read more...
Integrated risk management essential
August 2019, AVeS Cyber Security , IT infrastructure, Security Services & Risk Management, Industrial (Industry)
With manufacturing focused intensively on innovation, combined with a reliance on connected networks and products, it is highly vulnerable to cyberattacks.

Read more...
Data protection more challenging
July 2019 , Editor's Choice, IT infrastructure
The number of businesses unable to recover data after an incident nearly doubled from 2016, according to the Global Data Protection Index surveying 2 200 IT decision makers from 18 countries.

Read more...
Four essential cloud security concepts
July 2019 , Cyber Security, IT infrastructure
Security is a critical a component of any cloud environment, but to be effective, it needs to be as agile and dynamic as the cloud infrastructure being protected.

Read more...