![]() These additions, while still not reducing the resistance of the system in some instances, will allow the of the lightning into the earth without damage to the structure. When ground soil has poor conductivity, is very shallow, or non-existent, a grounding system can be augmented by adding ground rods, counterpoise (ground ring) conductor, cable radials projecting away from the building, or a concrete building's reinforcing bars can be used for a ground conductor (Ufer ground). ![]() Grounding systems without low resistivity to the ground can still be effective in protecting a structure from lightning damage. ![]() ![]() At the very least, the arc current will damage the lightning conductor and can easily find another conductive path, such as building wiring or plumbing, and cause fires or other disasters. If these measures are not taken, lightning current may arc over a resistive or reactive obstruction that it encounters in the conductor. For this reason, the down conductor route is kept short, and any curves have a large radius. While the electrical resistance of the lightning conductor between the air terminal and the Earth is of significant concern, the inductive reactance of the conductor could be more important. If the underground cable is able to resist corrosion well, it can be covered in salt to improve its electrical connection with the ground. Ideally, the underground part of the assembly should reside in an area of high ground conductivity.
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