Protection of Data Centers Against Lightning and Overvoltage Surges

In recent years, with the transition to cloud technologies, secure data storage and management have gained critical importance both on a corporate and commercial level. Today, large-scale data center projects are being implemented one after another, especially by banks and GSM operators. As the
Lightning Protection Center,
we wanted to evaluate the protection status of data center projects against sudden overvoltage and lightning impulses as a dedicated subject.

Investments worth millions, and more importantly, data repositories worth billions, can be destroyed within just 25 nanoseconds—and unfortunately, this does happen. Today, almost every medium-sized company has a server room, yet based on complaints received by us, servers are frequently damaged due to sudden overvoltage impulses. Beyond economic losses, the loss of data and time clearly demonstrates how vital protection measures are.

Commercial organizations that store the data of thousands of companies within cloud technology environments face even greater risks. Apart from lightning strikes, all line inputs may be damaged due to grid-based switching impulses. IT managers often justify the lack of protection by stating that their systems are powered by UPS units. However, it is critically important that UPS systems are also protected at both input and output with LV surge protection devices.

As we always emphasize, according to IEC 61643 and IEC 62305 standards, data centers must be protected following the principle of coordinated and staged protection. In simple terms, main power distribution panels and local panels of data centers must be protected with properly coordinated long-life B+C class surge protection devices. Product selection must be based on application requirements and risk analysis.

Additionally, UPS panels must be protected at both input and output with surge arresters tested according to 10/350 µs and 8/20 µs impulse waveforms, depending on their specifications.

Our core principle is to protect data, coaxial, and power lines against lightning strikes, grid impulses, switching surges, harmonics, and sudden voltage fluctuations. Following the installation of
LV Surge Protection Devices
in power panels, external telephone lines—typically arranged in 10-pair Krone blocks—must also be protected.

Subsequently, CAT cables entering patch panels must be protected. This can be achieved either by individual protection devices or multi-channel protection modules similar to those used in telecom exchanges, which reduce costs and simplify installation. Additionally, modem and DSL inputs (RJ11/RJ45), as well as RS-485 and RS-232 communication modules, must be protected in a data center.

At these points, Class D protection devices must be selected according to system characteristics. Class D protection applied to data and coaxial lines must also be implemented on power lines. Additionally, socket-type final protection devices should be used to protect the energy already secured at main and sub-distribution panels against residual impulses at end points.

While devices used in main panels have a surge current capacity of up to 100 kA, end-point protection devices typically handle up to 5 kA, as the impulse characteristics differ. Main panel devices activate within approximately 100 nanoseconds, whereas sub-panel devices respond within 25 nanoseconds. Therefore, the principles of coordination and cascading protection must never be neglected.

From a cost perspective, Class D protection devices range between approximately 25–35–45 Euros and deliver substantial protection at minimal cost. The most critical factor is selecting the right product for the right location. Rather than simply choosing CAT6 or PoE protection, correct voltage rating selection and proper installation are essential.

Although we have addressed the subject from the perspective of LV surge protection devices, grounding, equipotential bonding, and external lightning protection systems are also crucial for data centers. Equipment racks must be bonded using spark gap arresters, and all grounding systems within the facility must be interconnected. Instead of conventional
lightning rods,
isolated external lightning protection systems should be preferred.

In conclusion, data centers are of strategic, economic, security, and capital importance, and these investments must be protected through proper engineering and design. Our observations show that incomplete or incorrect products are frequently used in many projects, leading to serious problems. As engineers, it is our responsibility to minimize these risks in parallel with technological advancements.

As the Lightning Protection Center, we provide product selection, application, project design, and supply services for your data center projects. You may contact our expert engineering team at any time for professional support.