The second stage of the EPCOS SineFormer is an engineered EMC filter, so the second reactor is a CMC and the capacitor to earth is specially designed to be a lower impedance path to ground for the common mode current than the parasitic capacitance of the cable.
This product was specifically...
There is a solution for exactly this problem from EPCOS called a SineFormer. Also reduces motor bearing current to extend motor life. Check it out.http://www.epcos.com/inf/30/ds/b84143vr127.pdf
