I want to know Chemical Earthing is effective or not. Due to space consent we are confused which type of earthing we provide to our DG Set. Traditional earthing required more space then chemical earthing.

Dear Mr. Trivedi
Kindly elaborate the space restriction since conventional or chemical earthing follow same practice as far as codes and standards are concerned. The difference is that due to high soil resistivity, we use certain chemicals to pack the the earth electrode/plate to achieve better results. As you know the prevalent practice is to pack the earth electrode/plate with limestone and charcoal mixture (This practice is now obsolete due to corrosive nature of mixture which damages the installation as well as leeches to ground). Nowadays various materials are available in the market as ground enhance materials such as GEM by ERICO or FEM by W J Furse UK etc which conditions the soil and product better earthing values.

Interesting

The answer is yes, chemical grounding is effective in dry or rocky soils. They are essentially perforated copper tubes (or equivalent) that are charged with salts. As the salts leech into the surrounding soil, many electrolytic "roots" are formed and these roots increase the effective contact area between the soil and the grounding electrode.

Chemical earthing is basically misnomer. There is no such terminology in Electrical Engineering. Types of Earthing systems are basically Plate Earthing or Pipe Earthing, so to have low ohmic resistance of the electrode and less resistivity of the soil in contact, charcoal and salt is put in the earth pit, this is conventional earthing. In so called chemical earthing in stead of salt and charcoal, a filling compound is used which helps in retaining the moisture and reducing the soil resistivity and is definitely worth going in for this type of earthing system, irrespective of space availability.

Can't help wondering what packing with graphite might do.

Best to check soil resistivity first then decide. You may be ok without enhancing with chemicals.