An Isolation transformer is the best way to establish a new neutral-ground bond, in order to correct common mode and other grounding problems. A transformer can provide conversion of a Delta system (3 wire) to a Wye connected (4 wire) system. The addition of an electrostatic shield adds further protection from some high frequency impulses and noise that might otherwise pass through the transformer via the inter-winding capacitance. A shielded isolation transformer provides excellent protection from all types of N-G disturbances (impulses, RMS voltage, and high frequency noise). It is critical that the transformer be grounded properly or common mode protection will be ineffective. MODERN designs and manufactures the highest quality isolation transformers.