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Preventing capacitive coupling from the interference source to the screened wired.So, what is the aluminium foil wrapping Belden wires amongst so many, used for?
What could I be getting at home, a common domestic environment? ...
The aluminium foil is useless for magnetic shielding at low frequencies.A non-magnetic conductive shield will also shield against magnetic interference. It works because external alternating magnetic fields will induce currents in the shield which cancel out the external fields. (See Lenz's Law.) The shield's effectiveness depends on how conductive it is, and how good the conduction is across the seams.