EARTH TERMINATION

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An earth termination shall be connected to each down conductor. Earth termination shall be by 25mm x 3mm annealed copper tapes connecting
the down conductor at the testing joint to the earth electrodes. The connection of the down conductor to the earth electrode of the earth termination shall be soundly made by the use of plumbed joints, either by brazing using zinc-free material with a melting point of at least 600 0C or by exothermic welding or by cold pressure welding. The portion of the earth termination between testing joint and ground shall be enclosed in PVC casing of suitable size.

All earth terminations shall be inter-connected by 25mm x 3mm annealed copper tapes to form earth termination network. The copper tapes shall be identified by permanent labels legibly marked with words “Lightning Protection Earth ā€“ Do Not Remove” permanently fixed at 1000mm
intervals. The connection of two copper tapes shall be soundly made by the use of plumbed joints, either by brazing using zinc-free material with a
melting point of at least 600 0C or by exothermic welding.

Each earth termination connected to the down conductor shall have a resistance to earth not exceeding the 10 Ohms. The whole of the lightning protective system shall have a combined resistance to earth not exceeding 10 Ohms.

Bonding conductor of 70 mm2 PVC insulated green/yellow twin-coloured cable shall be provided for connection between the earth termination for
the lightning protection system at the testing joint and the main earthing bar for the electrical installation.


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