Where building has taken place, the site conditions may be altered by disturbance of the local stratification and natural geological formation when the electrodes have to be installed in this disturbed area. If a cut and fill exercise has been carried out then the top layer may be similar to the natural formation but increased in depth, whether it is good or bad in terms of resistivity. If an imported fill exercise has been carried out, the conditions of the upper layers may be altered considerably. In these cases, deeper driving of the electrode may be necessary to reach layers of reasonable resistivity and also to reach stable ground, such that the value of the electrode resistance remains stable if the top layers of the ground dry out. We, at Atul Casting and Metal Works manufactures all earthing related products such as G.I Strips, G.I plates, G.I Rods, G.I Pipes, C.I covers, Cable Trays, G.I Wire, Manhole Covers and Route Markers for past 50 + Years in heart of New Delhi. Call us at +91 9873361672 for best deals.