Fear Factory Tour A guitar pickup is essentially much like a powerful mike coil. For decades, energetic microphones have been wired with the voice coil mounted on the primary of the microphone's transformer, and maybe not recommended to ground (‘floating'). The microphone's case is usually attached to the cable shield, that will be connected to the microphone amplifier's soil (see Rane's site for more discussion).
By and big, energetic microphones are extremely quiet units consequently of the mix of transformer isolation and healthy, flying indication lines throughout, as well as shielded, humbucking coils.
So why don't you guitars? Guitars are once overwhelmed by noise. Humbucking pickups are just a partial (though essential!) solution. Well-known solution is always to float the guitar collection to a healthy productivity, just like a microphone. An identical idea was printed this 2001 patent request like this Fear Factory Tour?