I found the error.
The datasheet is right. I have to divide the voltage by 0.98 for a burden resistor of 100 ohm.
My mistake was calculating the current for the load. I was adding a sqrt(3) on a monophasic load.. 
I found the error.
The datasheet is right. I have to divide the voltage by 0.98 for a burden resistor of 100 ohm.
My mistake was calculating the current for the load. I was adding a sqrt(3) on a monophasic load..