# Connecting electric hob in Germany

I bought this induction hob (that sits on the table top), and I need to connect it to the wires.

The problem is that there are 5 wires, the hob came with a cable that joined 4 wires into 2 pairs at the end. That cable was too short so I switched it to a longer one (same thickness, same color coding).

Here is what the manual has to say on wiring:

The built-in cable had the cables arranged in the first arrangement (32A 1N ~)

The socket in the wall looks like this:

Seeing the slight damage, and knowing that another socket in my apartment has intermittent working issues (I'll deal with that separately), I wanted to make sure that my hob won't blow up when I connect it, so I took a cheap chinese multimeter and measured the voltage on each of the pairs.
And there I was, in shock:

• Blue - Brown = 230V
• Brown - Gray = 150V
• Brown - Black = 90V
• Black - Gray = 60V
• Blue - Gray = 60V
• Blue - Black = 120V

So no other situation is applicable other than the first one (32A 1N ~). Except that I have a problem with that, since my main switches that I guess are for this circuit are rated at 25A, so I guess that if I'll ever use them at 30A, they will automatically switch off, so I can't use my hob properly this way.

So I have the following questions:

1. What's going on? Why does my cheap multimeter measure 230V on one pair, and ludicrous values (60V) on others?
2. What would happen if I connect every wire to its respective color (thus possibly getting 60V instead of 220-240V)?
3. Are the automatic switches so sensitive that they do turn off at exactly 25A? Or can they go higher than their rating?
4. Is it possible that wires from 2 different switches converge into the same color? (in the photo you can see 2 blue wires, 2 brown wires, and 2 striped wires, so maybe I have 2x25A)
• It seems like there are some unhooked (floating) wires in this mess, although I'm confused by the way that socket is wired too -- rightly, you should be getting 230V across at least one other pair of wires. Besides, what in the world is that extra brown wire doing by itself? – ThreePhaseEel Sep 11 '16 at 15:16
• You need to have a certified electrician connect the hob. If you make a mistake and your house burns down, your insurance won't cover it. – Eekhoorn Sep 17 '16 at 11:35
• @ThreePhaseEel There's a 3 phase supply (brown, grey, black), neutral (blue), and ground (green+yellow) coming in via a five-core wire, and a single phase (brown, blue, g+y) going out somewhere else. – Martin Bonner supports Monica Mar 4 '20 at 21:23