Hi... Thx all for this answers...
All is measured, all it normal like resistance..sorry for mistake when postinh and not give a resistance of 5w resistor. I don't remember it but sure is under 1ohm, 0.22 or 0.33 i think..
I'm in Europe , and you can sketch circuit of main in many ways but the fact is: you have:
1: live wire(220v)
2: neutral wire
3: ground wire
... and in the distribution point(trafostation) the neutral wire and the ground wire is connected together...
Isolation transformer.... hmmm it's notning then just some induction of transformer or something like this... like I wrote, if I put the resistor parallel with DMM, readings are 0V... now, i have go a bit deeper in this so I connect regular 5mm led at this measured point (i think it's about 3V, 25mA)... and ofcourse I got.... nothing... so this measure of 100V is just DMM readings, and I'm sure that is mine isolation transformer good.
Once again, thanks everyone for help..