For the smart ones among us.
Frank, that's not me because I don't know the answer.

Prestcold often installed these condensor fans.
8 wires coming out the electrical motor. The 2 purples are the clixon.
OK.
The other 6 different colored are the 3 windings.

Suppose that the leads lost their colors.
How can you determine/measure how to connect the wires on he 3 phase net?

First, you can measure ohms to find the 3 windings but you don't know then which one of the two of the 2 leads of a winding pair is the beginning and the ending of that specific winding.

Of course, you can connect them to the power and measure the individual current of each winding and find out which one is wrong connected.

But that's not my question: it should be measured in some way before and connected to the supply from teh first time correct.

Like they said in France: 'Allez-y ceux qui pense qu'ils savent tous"