Shield wires for lightning protection on poleline spans are sometimes periodically insulated from other tower metal to limit circulating currents that may occur with multiple ground connections.
Now that is a HUGE, but true statement Bjarney, it does not even have to be an HV system we are talking about here.
Circulating currents happen in so many LV systems, not so much because of poor installation, but because of poor design.
For a start, you'd think that HV design engineers would listen to those in the field.
Nope!.
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