Extra ports? "30 AC REF 13 & 14

I have just received my first IoTaWatt. The unit I have received appears to have 2 additional ports that do not appear in any of the product photos nor the documentation. These are located on the opposite (narrow) and from the 9V AC REF and 5V DC USB ports. The two ports are labelled 30 AC REF* 13 and 14. (see attached photo)

What are these ports?

Those are alternative jacks that allow inputs 13 and14 to be used directly as voltage reference inputs rather than CTs. They are used for direct voltage reference in three-phase systems.


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