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Lightning protection system, equipotential bonding and surge suppressor (SPD)

Brain protection system, equipotential bonding

and surge suppressor (SPD)


  1. Brain protection system (KS C IEC 62305-1)

1.1 Lightning protection systems (LPS): An entire system used to protect a space against the effects of the brain. This system consists of external and internal LPS.

1.2 External LPS: This system consists of an air-termination system, a down-conductor system and an earth termination system.

1.3 Internal LPS: All measures in addition to those specified in the ‘External LPS’ to reduce the electromagnetic effects of lightning current within the scope of protection.



  1. Equipotential bonding (KS C IEC 62305)

2.1 Equipotential bonding of power equipment and communication equipment under general conditions

All conductors in the line must be bonded directly or indirectly. The charged conductor must be bonded to the LPS through a surge suppressor (SPD) .

2.2 Equipotential bonding of external incoming equipment

Externally conductive parts, power lines and communication lines should enter the building from one part near the ground surface.



  1. Surge suppressor (KS C IEC 61643-11)

A device that limits transient overvoltages and prevents surge currents from flowing through the load by allowing the surge currents to flow through itself.


Until now, electrical grounding work has been divided into power use and communication use ( A ). This was a measure to prevent communication-related systems from being damaged by lightning. However, as communication developed, most equipment formed a network through communication lines, and as a result, damage from lightning increased significantly. During a lightning strike, the system is damaged by the voltage ( C ) that appears between grounds. In particular, communication equipment suffers damage. This is because when two or more lines are connected to one equipment, grounding is used separately. The closer the distance between two grounds, the smaller the voltage between them. The closest is when the two grounds are close to each other. Therefore, in recent years, a common grounding method has been used to connect all grounds to one place ( B, D ).




It is recommended that surge suppressors be installed on all lines connected to equipment to be protected, and the grounding of each surge suppressor and the grounding of the equipment must be tied to one location to maintain equal potential in transient conditions.




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