JoeCoolDXer wrote:
> It's interesting how certain requirements creep into specifications possibly
> just because it's possible to do them.
> Recognize if lightning gets into a home it seems to have no trouble traveling
> through screwed
> and friction (plug-in) connections, sharp bends, and ultimately zapping lots
> of stuff.
>
> If CADwelds and OneShots are important in ground rod connections, why then,
> for example, is it not also required
> to weld all those electrically unreliable bolted joints between tower
> sections...??
>
> Don N7EF
different sets of rule makers for one thing.
You don't have to have exothermic welds on grounding systems. Listed
compression clamps will work (and I suspect a bolted connection for a
tower would too.. bolted connections work for structural steel grounding)
The rules on bending of lightning conductors are not because of the
impedance or inductance, (the inductance of a half turn 6" in diameter
is tiny, compared to the resistance of the conductor.. a whole turn is
only 0.3 uH, and a half turn is less than half. The 9" of wire would
actually be about 0.1uH.)
It's because of mechanical forces from the magnetic field (which is
technically related to inductance).
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