the smart maximum shrink is the breakdown voltage of the insulation on the cord or the breakdown voltage of the air hollow between adjoining wires. there's a shrink to the quantity of potential you may get out of a transformer through potential of the magnetic field, and while the magnetic field saturates the hollow between the standard and secondary, the secondary voltage will flatten. The saturation relies upon on the textile between the windings; no remember if it somewhat is barely air, the saturation is rapid, no remember if it somewhat is iron, a brilliant style of magnetic flux would properly be present in the previous it saturates