vRef ION8650 ground question

[KimS]

Is the ION8650 internally grounded for the vRef?

Customer wants to know if they have 2PTs and 2CTs to one meter in parallel he does not multiple grounds. Form 35S ION8650.

Are current terminals, I11, I12, I31, and I32, are they internally grounded

[Charles_Murison]

If the system has PTs with a grounded secondary, you need to connect the secondary ground to Vref to be able to invert PT polarity.

If not using PTs, DO NOT connect Vref to ground, Connect Vref to Vb.

Regards,
Charles

[DanL · Accepted solution]

The "Vref" measurement terminal of the ION8650 is not ground bonded, but instead has a 5meg-ohm input impedance (to ground).
The current terminals, I11, I12, I31, and I32, are NOT internally grounded.
You should ensure the ION8650 itself is grounded; either via the AUX power supply, socket base, or ground screw on the bottom of the socket meter.