Sudden changes in voltage, caused by user error, loose connections or equipment faults, can result in a brief, medically harmless but unpleasant “electric shock”.
Sometimes, a brief “electric shock” may occur during treatment. This is caused by very rapid changes in voltage and is also known as the “electric fence effect”. Medically, this is harmless, but it can be unpleasant.
Possible causes include:
The device is switched on or off whilst the electrodes are still in contact with the skin.
A sudden interruption of the circuit, for example when quickly withdrawing hands or feet from the bath.
Loose connections or loose contacts on the electrode cables or the power supply unit.