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Hi,
Shielded wire consists of a piece of insulated wire that has either a braid of wires or just a number of plain wires twisted around it and then a second insulator over the top of these. When used the outer shield is connected to a ground point.
I do not know if that is what you really wanted to know :| or if you meant shielding of a very high impedance circuit track on a pcb. This involves running narrow guard tracks on both sides (and usually around the ends) of the high impedance track and connecting one end of the guard track(s) to a ground point, this prevents other signals present on the pcb leaking across the pcb surface contaminants and coupling into the high impedance track thus corrupting its signal. These are used with electrometer amplifiers etc which have imput impedances at least 1GΩ.
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