Lightning is not indifferent to less than perfect joints. A small amount of
resistance in a joint can allow a large voltage rise across the joint with
the high current of lightning flowing thru it. That is why it is recommended
to cad weld all ground rod connections to make sure that the connection
remains a zero resistance joint.
73
Gary K4FMX
>
> While I only have sufficient knbowledge on the subject to ask questions,
> logic seems to tell us that "bonding" could be counterproductive. If the
> purpose of bonding is to provide a good ground for lightning, that would
> be
> a meaningless act, since lightning is indifferent to less than perfect
> joints. But, if the purpose of the bonding is to provide a zero ohm
> connection, then the only thing that would prevent that is corrosion -
> which
> could occur by placing the copper bonding strap at the connection. What
> would start out as a good connection could be made less than perfect by
> corrosion created by the addition of the unnecessary copper bonding strap.
>
> As I understand it, even though the joint has substantial pressure, the
> process of fretting can create corrosion on the surface of the joined
> surfaces - which would then act as a less than perfect conductor despite
> the
> pressure. If that occurred, then we no longer have a zero resistance
> connection. That process would not be likely to happen without the copper
> bonding straps.
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