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Wago connectors with too many wires

Branta

The electrician who wired my (new) home takes the live feed to a light switch in each room (rather than to the rose).  Thus each room has a light switch back box with four neutrals commoned in a WAGO 2273 connector (feed in, feed onward, wiring to luminaire, wiring to spots).  I'm guessing the spots were a surprise to him as he seems only to have had a stock of 3-way WAGO connectors.  He's consistently managed to wedge four 1mmsq wires into a 3-way WAGO 2273.

I know this is wrong, the "extra" wire just can't be clamped like the WAGO design intended.  What is driving me nuts is that nowhere can I find it written down that it is wrong !

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    I am trying ti remember where but I am sure I have seen specific information from wago stating one conductor per terminal.

    Personally I think there is a difference between a single 6 or 7 core cable and multiple single core cables. If the wago only makes good contact with 2 or 3 cores of a multicore cable it's probably fine as those cores will be in good contact with the other cores along it's length. It's actually unlikely that it will make direct contact with the center core at all.

    With multiple single cables the connector is unlikely to make good contact with all of the cables which could give a higher resistance and probably more importantly the cables not making good contact will be easy to pull out. I would expect that event with only two cables in one terminal if one of those cables is bent slightly it will reduce contact reliability with the other cable. 

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    I am trying ti remember where but I am sure I have seen specific information from wago stating one conductor per terminal.

    Personally I think there is a difference between a single 6 or 7 core cable and multiple single core cables. If the wago only makes good contact with 2 or 3 cores of a multicore cable it's probably fine as those cores will be in good contact with the other cores along it's length. It's actually unlikely that it will make direct contact with the center core at all.

    With multiple single cables the connector is unlikely to make good contact with all of the cables which could give a higher resistance and probably more importantly the cables not making good contact will be easy to pull out. I would expect that event with only two cables in one terminal if one of those cables is bent slightly it will reduce contact reliability with the other cable. 

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