The establishment of EVISA is funded by the EU through
the Fifth Framework Programme (G7RT- CT- 2002- 05112).
Supporters of EVISA includes:
created by a power supply or function generator of alternating
polarity. Typically, an arc excited at twice the frequency of the
electrical grid (50 Hz except North America, which is 60 Hz). While not
continuous, the period of low current as the polarity of the driving
voltage commutes (switches sign) is brief compared to the overall