Energy measurement multi phase

Hardware
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1

In my home 2 of the top energy consumption users are the oven and the cooking hob.
Both are connected through double feed 220V power supply. So there is 1 cable connected with 5 wires. (2 * 220V line, 2 * Null and 1 * ground).

Is there a way to measure the power consumption? My idea is using clamps, but because everything goes through 1 cable, I am not sure this will work, or how to set it up.

From what I read so far, everybody advices NOT to use a power measuring plug on these high power devices. So that is not an option for me.

Thanks for all the effort!
Willem-Bram

2

What country?

3

The Netherlands

I have a 3 phase connection to the grid.
The oven is on 1 phase, but usage 2 separate 220V inputs.

4

So you have 380V across the phases.
Nothing comes to my mind you could do only with those two wires. You could use Shelly 3EM though to monitor it if you connect it to neutral as well.

5

Thanks,

That was the only real option that I could think of myself. I’ll give it a go.

6

Since you are measuring pure resistive load (pf=1), in theory you could use just Shelly EM and connect it to L1/N and measure only current and voltage of L1. You multiply it SQRT(3) and you get power. There would be small error because all phases are not perfectly balanced, but if few percent error is tolerable it could be option. Just in case you happen to have one single phase EM in your drawer.