The 800VA toroidal transformers are commonly used in the high-end tube audio amplifier and RF transmitter. They have static shield between primary and secondary coils to improve the isolation and noise interference. This toroidal transformer has a very low magnetic leak. They are specially designed to work on all standard 115V or 230V at 50Hz or 60Hz. These transformers have heavier gauge wires then the normal requirement to avoid the copper lost during the full power output. The dielectric test is more than 3500V in between primary and secondary coils. Please see the test data for short circuit and open circuit. In most of the cases, this transformer can be output 20% more power from its rating at 60Hz power source without any problem. This transformer comes with 2 rubber pads and all mounting hardware.