Do not connect the lightning tower to the grounding grid through a secondary ground connection. This is because: the lightning rod in the lightning current into the earth when the high-frequency characteristics of the lightning current, will lead in the line to produce a higher instantaneous high potential, so the lightning rod to the grounding wire between the lead should be shorter Well, otherwise the high potential on the lead will be counterattack to other objects around it. At the same time, since the secondary ground connection line can not be a good shunt to the main lightning current to the main ground wire, resulting in a higher step voltage near the lead. Therefore, the lightning rod should be connected directly with the grounding network, if there is no grounding near the lightning rod, lightning rod should be set around the grounding resistance of 10 ohm independent grounding network, grounding network should be made of pressure ring, as far as possible to reduce the step voltage.

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