How to calculate max length of 350m to the last device?

[ergo14]

Hi, how should I calculate the line length.
Do I sum all the cable from all branches (basically everything that was put to walls), or is that the actual longest branch length?
So if i have 2 branches, one is 103m in length and other one is 115m in length - does it mean that max length is 218m or is it 115m?

[matthiaz]

Without knowing much, I would say shortest distance.

[Gast1961]

There is some information in KNX Basic Course documentation in the chapter on distributed power supply.

For centralized (single) power supply, the maximum distance from any device to the power supply is 350m, and the maximum total cable length in the line is 1000m.