What does Eltex mean by active length, total length and installation length?

The active length of a bar is always measured between the first and the last emission tip of the bar.
The total length is the active length plus the insulation distances beginning from the first/the last emission tip to the beginning of the bar/the end of the bar. For the charging bar R130 (30 kV), this is 70 mm, for instance.
The installation length is the total length of the bar, the length of the cable connection and the bending radius of the cable.