Suitable methods of jointing are a taper pin driven into a reamed hole and riveted over or a copper stud screwed into a tapped hole and riveted. Such joints should be protected by a heavy coat of bitumen. The connection between the earth plate and the disconnecting link should be set vertically and the depth of setting should be such as to ensure that the surrounding soil is always damp. The minimum cover should be 600 mm except that where the underlying stratum is solid, for example, chalk or sandstone and near the surface, the top of the plate should be level with the top of the solid stratum. Sufficient solid stratum should be removed and replaced with fine soil or other suitable infill to ensure as low a resistance as possible. The use of coke breeze as an infill is not recommended as it may result in rapid corrosion not only of the electrode itself but also of cable sheaths, etc, to which it may be bonded. 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