There are two pipes one inside the other i.e, Pipe-in-Pipe Technology

One G.I / C.I Pipe of a particular diameter.

Safe Earth Electrode is not in direct contact with the soil.

The earth electrode is in direct contact with the soil.

3

Absence of Corrosion.

Liable to fast corrosion, subsequent decay of the earthing pipe / plate .

Galvanization is adequate i.e, 80-100 Microns.

Galvanization is not adequate.

Practically no need to change i.e. fit and forget.

Needs to be changed in every 3-4 years.

S.E.E is non-corrosive, so there is not much variations in Ohmic value.

Back fill compound used will be washed away in rainy seasons & will be resulted as high Ohmic value.

It requires less space and time to install the earthing electrode.

It requires large space and time to install the earthing electrode.

No fluctuation of Ohmic value. It has been proved at various sites that Ohmic value of safe earthing electrode reduces with age.

Fluctuation of Ohmic value is more, resulting in frequent maintenance of gadgets/machines and may endanger human life too.

Since S.E.E is surrounded by highly conductive soil so the charge dissipation through the electrode is very high and the current density across the electrode is very low which results in very high fault current, is sufficient to trip the fault relays.

Distribution of short circuit currrent is less in terms of charge dissipation therefore it generates high potential at the pit whch results in low fault current in comparison to required tripping circuit of fault protection relays.

The Back Fill Compound used is not soluble in water and it becomes part of the soil around the electrode.

Backfill compound (Salt) used will be washed in rainy season and will be resulted as high Ohmic value.