Thank you for your fast response. I think that the method you mentioned is the one described in this post, right?
(the post contains also a link to this article
What I’m not yet able to grasp after reading thoroughly the post is how to handle the situation in which you have mixed loads in the same circuit, i.e.:
- Loads connected from phase to neutral wire at 230volts like heating or lights
- Loads connected between phases at 400 volts like engines.
If I want to measure the power used by this circuit, where do I have to connect the VT? Do I need a voltage reference of 230 volts or one of 400 volts? I’m still feeling that there’s something missing in order to correctly compute the power used. (I could simply check as soon as I will have a Iotawatt unit but I would prefer to order everything I need on the same order).
Alex