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Interesting! I have been using the wire as it was received, but it is used wire. Haven't had a lot of trouble with it bending yet. I will chuck some up in the lathe and twist it.
Someone may have an opinion on that, but I would say as long as it does not bend on you, it really wouldn't matter. A lot of guys like those copper gutter nails because they are quite hard, but if you get some, make sure they aren't just plated with copper. I like harder copper myself and it's plenty soft to grab an edge and that is your main concern. I think all grounding wire is pretty much the same alloy and you will want to twist or hammer it because it is annealed and very soft so the electricians can bend it easily.
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