• Salt is a good conductor (when damp) EDIT: "Why is salt added to charcoal?" Both (damp) salt and charcoal are good conductors. Charcoal stays with the earth rod, salt diffuses into the damp surrounding soil, increasng the conductivity. Just salt, and all your earthing eventually washes away. Just charcoal, and you won't get such a good result.
  • I know for electrical earthing needed add salt and charcoal. but how many salt and how many charcoal?
  • salt maintains moisture and charcola gives good conductivity causes earth point/pit in good electrical conductivity place

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