ADE7878A: isolation requirements

Hi everybody,

I have to draw the schematic of a three phase e-meter which mounts ADE7878A. The e-meter measures the three voltages (3 x 230Vrms) by means of three resistive dividers (direct measure of the voltages) and uses CTs to measure the currents.

The e-meter should be certified in accordance of EN61010-1:2010 3rd Ed. Which working voltage should be considered to design the isolation barrier between the ADE7878A and the microcontroller? 230Vrms or 400Vrms?

Regards,

Alberto