For conventional sizes, the resistance is approximately inversely proportional to the linear dimensions, not the surface area, that is a 0·9 m × 0·9 m plate would have a resistance approximately 25 percent higher than a 1·2 × 1·2 m plate. The current loading capacity of a 1·2 m × 1·2 m plate is of the order of 1 600 A for 2 s and 1 300 A for 3 s. Plate electrodes shall be buried such that its top edge is at a depth not less than 1 5 m from the surface of the ground. However, the depth at which plates are set should be such as to ensure that the surrounding soil is always damp. Where the underlying stratum is solid, for example chalk or sandstone and near the surface, the top of the plate should be approximately level with the top of the solid stratum. 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