Originally posted by openhelix:
If everything is grounded/filtered correctly I really don't see how low voltage signal will bleed over onto AC.
Imagine a long coax, both ends of the shield earth grounded. Now send a current through the center conductor, through a load, and back up the shield. Notice that there are two 'return' paths for current, one along the shield, one in the earth.
Gounding/filtering won't really help.
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