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What is national grid?

What are the spiral coils that I saw on national grid cables for? It must be to do with discharge protection?

  • These coild were approx 25cm long, and the diameter at the "wide" end was perhaps 7cm or so. The coil seemed fixed at the narrow end to the grid cable. The cables in question were lower voltage than national grid - they were part of the grid over Rye Harbour Nature reserve, and only several metres above ground.

  • Answer:

    Cables over nature reeserves are often marked with coils to help prevent flying birds particularly swans and geese from flying into them

wrightch... at Yahoo! Answers Visit the source

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these sound like the ceramic insulators that fix to the pylons and attach to the lines at the other. there are many different kinds but all form a high resistance barrier from the metal support.

philip j

They stop birds flying into the lines

mad_jim

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