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Another grounding question



Most people say to use "copper strap" to connect the secondary to the
ground, and to connect the ground rods to each other.  What exactly is
copper strap.  I always assumed it was a roll of thin copper, but I've
seen it in other places referred to as copper roof flashing cut into
strips and soldered together.  Doesn't this get expensive?  Would it be
cheaper to just use welding cable?  And easier too, because wire is
easier to work with?  What's the trade-off in quality?

Thanks a lot,
Adam