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Lightning!
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<blockquote data-quote="greybeard" data-source="post: 1811096" data-attributes="member: 18945"><p>Probably so, tho I think they use hydraulic crimpers now.</p><p>Lots more to grounding and bonding something like a substation or tall building than just the down rods and cables. The mesh under the station/building to dissipate that much current is pretty extensive as is the above surface media used to protect workers from everyday stray voltage they may encounter just walking along. Lightning arrestors are a big part of any installation.</p><p></p><p>I have seen a helicopter get hit by 2 strikes just a few minutes apart and then heard the radio chatter from them telling us we just got hit. We barely knew it other than hair on our arms. Faraday effect protects aircraft most of the time and same for automobiles.</p></blockquote><p></p>
[QUOTE="greybeard, post: 1811096, member: 18945"] Probably so, tho I think they use hydraulic crimpers now. Lots more to grounding and bonding something like a substation or tall building than just the down rods and cables. The mesh under the station/building to dissipate that much current is pretty extensive as is the above surface media used to protect workers from everyday stray voltage they may encounter just walking along. Lightning arrestors are a big part of any installation. I have seen a helicopter get hit by 2 strikes just a few minutes apart and then heard the radio chatter from them telling us we just got hit. We barely knew it other than hair on our arms. Faraday effect protects aircraft most of the time and same for automobiles. [/QUOTE]
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