BASIC LIGHTNING - Down Conductors - IEC 62305-3


The down conductor spacing is determined by the Class of LPS and is shown in the table below.
The lightning energy is shared by the down conductors.


  1. A minimum of two down conductors spaced around the perimeter should be used on a structure. Wherever possible the down
    conductors should be installed on the exposed corners of the structure.
  2. The down conductor should be run in the most direct route to the earth system.
  3. Avoid sharp bends and corners.
  4. The use of rebar and other metal as fortuitous down conductors is recommended.
  5. The recommended fastening of down conductors is 1000mm centres.

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