Solid seems right to me, too, but I wonder why a lot of traditional
lightning protection is done with stranded. See, for example,
http://molasar.blackmagic.com/ses/bruceg/EMC/litfacil.html . My house
lightning system (predates me) was done with stranded.
The references state that the quality of a grounding conductor is
specified by the number of pounds of copper per 1000 ft! At least
187.5 lb / 1000 ft. That's good for DC lightning, at least. :-)
I suspect the real reason for stranded is that it's just easier to
install on a typical building.
Here's a more interesting question: why would you use solid core
wiring, when you could be using copper tubing - if not strap? Is it
feasible to use copper pipe for grounding conductors? How would you
connect sections? The easy way is solder, but that might not stand up
to a big surge.
73, Martin AA6E
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