I would not go as far as to say completely safe. If the power supply is supposed to automatically to detect the applied voltage and act accordingly, there is no guarantee that this circuitry is working, particularly if the device has only ever been used on the lower voltage range for all of it's previous life. I have personal experience of a device which failed in this way, even though it had only ever been used on a 220V supply. One day the voltage range switching circuitry failed and the power supply became configured for 110-125V resulting in blown fuses and damaged parts when 220V was applied. Additionally, if the power supply does not automatically detect the applied voltage range, there may be not very obvious switches, jumpers or connectors that have to be changed to suit the higher voltage range. Regards, Peter Coghlan. Alexandre Souza wrote: