Connection of washing machine & dishwasher via a socket (T15)

The easiest way is to replace socket T15 with a 3xT13 (separate). This way you can plug in three devices, and each has its own live conductor. The neutral conductor is common for all three.

The easiest way is to replace the T15 socket with a 3xT13 (separate). This way you can plug in three devices, and each has its own live conductor. The neutral conductor is shared among all three.

This is a good option and can be done relatively quickly. If this socket is still surface-mounted, it can be done in a few minutes.

Yes, that would also be my approach and to connect the individual devices separately. For me, it is also too risky at a junction box. Especially with these machines.

The easiest is socket T15 with a 3xT13 (separated) to replace.
This way you can plug in three devices, and each has its own phase conductor.
The neutral conductor is common to all three.

This is unfortunately prohibited.

There are indeed triple separated 3xT13 sockets, but these are only approved for operation on the same phase conductor (for 2-3 light switch groups on the same fuse).

If the phase conductors need to be split, this must be done with individual sockets.

The reason is that the internal neutral bridge in the triple socket is not designed to carry high neutral currents (as can occur in three-pole operation with inductive and capacitive consumers).

Such an installation contradicts manufacturer standards, installation regulations, and is therefore also a problem regarding insurance in case of damage.

Thank you very much for your information. I also wanted to do it the way [marko777] suggested at first. But now I have read your suggestion and will apply it that way. Especially if damage should occur, there will then be problems with the insurance.