The field of Electrical engineering has seen tremendous advancements over the years. Electrical Earthing remained a neglected area for long though it plays a very important part of all electrical distribution systems. The importance of efficient earthing is realized only after suffering serious damages to costly equipment and lives.
Quite often, good earthing results cannot be achieved due to high resistively of the soil at the location of electrical installations. Most of the resistance of an earth electrode is accounted by the soil very close to the earth electrode. Hence the nature of the soil immediately surrounding a ground electrode is very important. If the soil resistivity in the immediate vicinity of an earth electrode is high ( as in case of rocky/sandy and dry soils) the bedding resistance will be high and therefore the overall earth resistance will be high.
It has been a general practice to artificially treat the soil with common salt, charcoal, soft-cake and other similar backfills in order to bring down the earth resistance, These conventional methods are not effective and permanent is soil of moderately high resistively and porosity. Where the soil resistively exceeds 50 ohms the low quality chemicals /conventional backfills will be inadequate to get the desired value of earth resistance permanently. Research has proved that, if a compound of high electrical conductivity fills up the space around the ground electrode, the earth resistance value would decrease appreciably.
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