South Africa’s summer season brings with it the possibility of lightning strikes. The massive voltage fluctuations caused by these can damage sensitive equipment, as well as cause data loss on computers, servers and storage devices. To combat this, DEHNcord surge arrester offers reliable protection from lightning interference in a flexible and space-saving package.
Hano Oelofse, DEHN Africa technical director, notes that Type 2 surge arrestors are devices designed to discharge the currents generated by indirect lightning strikes, which can cause induced or conducted over-voltages on the power distribution network. They are installed in the main distribution switchboard.
He explains: “The DEHNcord Type 2 surge arrester, available in single-pole, two-pole and three-pole versions, can be fitted in installation systems such as the terminal compartments of end loads, cable ducts or flush-mounted systems. The compact design allows it to be installed wherever the performance of a standard Type 3 surge protective device for terminal equipment reaches its limits. The lighting protection offered by DEHNcord helps to offset the possibility of lost productivity and costs for the repair or replacement of equipment after an unprotected lighting strike.”
It can also be used at the transition from lightning protection zone (LPZ) 0B to 1 or higher. DEHNcord meets the requirements of EN/IEC 61643-11. It has a short-circuit current withstand capability Isccr of 25 kA(rms) in case of mains-side over current protection, and a total discharge current of 20 kA (8/20 µs). Other features include:
• Single, two or three-pole surge protective device with monitoring system and disconnect.
• Visual fault indication.
• Types with disconnection of the load circuit in the event of a fault and protection of the control phase.
• Compact design also for outdoor use.
• Can be fitted in junction boxes, flush-mounted systems, cable ducts and flush-type boxes.
“Despite the compact design, the device houses a visual mechanical operating indication, as well as disconnecting the load as soon as it is tripped,” concludes Oelofse. “DEHNcord can be adapted to existing installation systems to ensure reliable protection of terminal equipment at minimum expense, takes up little space and saves installation time. When space is restricted in the cable duct, DEHNcord is the ideal solution thanks to its flexible terminals.”
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