It doesn’t have anything to do with house power. The arcing of router brushes, which increases with increasing speeds and power, radiates electric fields. Router and HF spindle currents, which increase with router power, radiate magnetic fields. Both field types are parallel to the motor power cables, so wires parallel to them will pickup the most radiation. Separation helps because the intensity of the both fields decrease with distance. Convention shielding of the motor power cables helps reduce electric field radiation, but doesn’t affect magnetic field radiation, Magnetic field radiation can be reduced by twisting the motor power cables, but that doesn’t affect electric field radiation. The KISS and likely most effective approach is proper cable placement. Routing the motor power cable with the dust collector hose (and cooling water/air compressor hoses?) may not be “pretty” but it would be effective and minimize repeated flexing of things that don’t like that kind of treatment.
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