For epee, there is an open circuit set up by the system, which is closed when a touch is landed. The B wire of the epee is hot, the A wire is the return current, and the C wire of epee is grounded, along with the bell guard and piste. If the epee touches the piste or the opponent's bell guard (B touches C), nothing happens. When a touch is landed (B touches A), the circuit is closed, a buzzer goes off, and a colored light lights up. There are no off-target hits in epee, so a point would be awarded. Also, fencers can score simultaneous touches in epee.
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