Summation CT connections

[Kesendra]

Does the secondary of a summation CT need to be earthed or not?
I have 3 seperate summation cts that will be connected to a quality of supply meter and I am not sure if the secondary (s2) needs to be earthed.

 

[scottf]

As a general rule, the secondary circuit of any CT should have a ground reference.

 

[Kesendra]

Thank you. I agree as well.