Lightning Equipotential Bonding

What is lightning equipotential bonding ?

The lightning equipotential bonding can be explained as bonding of separated conducting parts to the Lightning Protection System either by connecting them directly or through Surge protection devices in order to reduce the differences in potential caused due to the lightning current.

It is very essential to perform equipotential bonding to all the down conductors to reduce the probability of damage caused due to lightning current flowing in the Lightning Protection System. This prevents from dangerous sparking that may occur between the external Lightning Protection System and other components.

Metal installations like gas pipes, water pipes, air pipes, heating pipes, shafts of lifts, crane supports etc. shall be bonded together and to the LPS at ground level.

The Lightning equipotential bonding to metal works external to the structure to be protected is very much important as they may get affected while installing the LPS. Also, Lightning equipotential bonding should be integrated and coordinated with other equipotential bonding in the structure as shown in the picture above.

When the building height exceeds 30 m, equipotential bonding is performed at 20 m level height and also at every 20 m above that. That is, on such cases the external down conductors, internal down conductors and metals parts are to be bonded.

The cross-section of the conductors connecting different bonding bars to the earthtermination system should be as per IEC /IS 62305 – part 3 and is independent of class of Lightning Protection system.

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