EVAL-ADE9000EBZ vs EV-ADE9000SHIELDZ

Hi, 

the EVAL-ADE9000EBZ board is using ferrite beads on both voltage and current inputs, the EV-ADE9000SHIELDZ only on the voltage inputs.

Is there any reason for this difference between the two design? What is the recommended design?

I would like to power up my prototype board with an embedded AC-DC switching power supply (IRM-03-5 or similar + a 3.3v LDO), the power supply input AC neutral and output GND pins will be connected to the meter GND, after the neutral ferrite bead. Could this design introduce some noise? do you have a recommended design for this?

Thank you.

Kind Regards,

Domenico