Complete noob here.

I'm finishing building my kitchen and the last part - the wiring of electrical oven and glass cooking plates, is presenting me with some challenges.

I am located in Germany.

The oven comes out with a 3 pronged cable (I guess active, neutral and ground?).

oven cables

The cookers were sold to me with no cable.

There is one junction box at the intended spot in the kitchen, with 5 cable grips, which is definitely 3 phase.

junction box

I'm wondering what's the best course of action with both the oven and the cooking plates.

My thoughts so far:

  • Is there a way to connect the cooking plates to the same junction box as the oven somehow, without blowing things up?
  • If not, should I just connect them to a nearby socket with a cable ending with a regular socket plug?
  • What about the oven (single phase cables) vs the junction box (3 phase)?

Note: the sockets seem to have ground clips here - see picture below.


  • 1
    Before rushing in and connecting color to color, it would be a very good idea to use a multimeter and check as I think there are 5 wires which is possibly 3-phase. And the Swiss do the same thing...
    – Solar Mike
    Jun 16, 2019 at 15:29
  • @SolarMike you were right (I checked the fuses without even bothering with the mm). Well, that complicates things even further I guess...
    – Mena
    Jun 17, 2019 at 7:45
  • Need to see the hob too. I would guess that the hob uses two phases 16A and the oven 1 phase 16A. Jun 17, 2019 at 10:47
  • @SomeoneSomewhere thanks for helping out. At a first glance, the hob seemed to support both 3 phase and single phase, but it was sold to me with no cable. I can post a picture later today if that helps.
    – Mena
    Jun 17, 2019 at 11:21

1 Answer 1


Get a mm and check the voltage between the wires (phases).

Ignore the green/yellow for this.

If the black is neutral (likely) then the voltage between any of the other 3 and the neutral should be around 380V.

Between any 2 phases (brown, gray, blue) should give you 230V.

So, as the load on phases should be balanced, I suggest you get a competent electrician to check and connect this for you. That way (s)he can check which appliances are on which phase.

I had an issue with my hob.. puled the oven out to clean it and a wire popped out for the hob. Not thinking I put it back (blue to blue)... Massive bang and off to buy another hob :) happy days... Made sure of the voltages before connecting the new one...

  • Sigh... I guess I'll have to get someone to do this for me as you say :( Do you think it's technicaly feasible to have both appliances on the same junction box?
    – Mena
    Jun 17, 2019 at 8:00
  • I have a 3-phase oven and a single phase cooker on the same point works fine, this may depend on the regulations in your area, so a good electrician will have this done in an hour... Much less cost than the grief...
    – Solar Mike
    Jun 17, 2019 at 8:03
  • definitely will be looking for some qualified help - hopefully I can even learn a thing or two in the process :) Thanks again
    – Mena
    Jun 17, 2019 at 8:21
  • Blue is likely to be the neutral in Europe; Brown/Black/Grey are standard phase colours. Black neutral is old UK & colonies. Jun 17, 2019 at 10:46
  • @SomeoneSomewhere phase colors are red, yellow & blue for some, so be careful... making such sweeping statements can cause lots of problems : just use a meter...
    – Solar Mike
    Jun 17, 2019 at 11:01

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