Possibly a "bug" ?

[FredM67]

Hi,
I'm wondering why the voltage sense on L1 is not exactly "directly" measured like on L2 and L3.
There're some additional components, like a capacitor and a common chocke.
Wouldn't it interfere with the measure, since L2 and L3 do not have these components ?

It could be, my electronic knowledges are too low ;-)

Fred