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The Swiss Way



We recently had our kitchen rebuilt and at the same time the distribution box was updated. Here are a few pictures to show a non UK installation. The supply is 3 phase 20A per phase. Lights and sockets are generally 1.5mm2  singles in conduit. Appliance power (2 or 3 phase) is usually cables in conduit. Sockets and lights are on the same circuit for a large room or a number of small rooms. Neutral used to be yellow and is now blue. Phases are red, white and black. Circuits after the switch can be any other colour.

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Bare kitchen with first fix cabling

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Ready for a light fitting

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The bottle fuses were for the appliances, 2 phase for the oven and hob and 3 phase for the dishwasher. The Bathroom and toilet had an RCD. The bedrooms and living room MCBs with neutral isolators.

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Plasterers are the same everywhere.

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Space for the oven and fridge freezer with wiring.

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Wiring for the hob (cable) and sockets (singles).

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New distribution box. 3 phase MCBs for the oven and hob. RCDs for the dishwasher and lighting and power circuits.

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Supply details

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Incoming cable to the block (6 apartments)

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Meter cupboard


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Finished ?


Best regards


Roger



  • Andy, it appears that the Swiss definition of TN-S is slightly different and applies after the main fuse. The attached picture is taken from 'Elektrische Installationen und Apparate by H. R. Ris' (just to avoid any copyright problems ? ). What is described as TN-S is after the main fuse. What is described as TN-C keeps the PEN right to the point of use as long as it is larger than 10mm2. TN-S-C combines both, splitting the neutral and earth when the CSA drops below 10mm2.


    Z, A nice tool, but as ever made in Germany and labelled in English ?


    Best regards


    Roger

    cf9a17ff24f36dc99340196b38d85a15-huge-tnsc.jpg
  • Der Schutzleite PE wird ab der Anschlussicherung abgefurt..

    (the protective cable PE is lead off separately from the (place of ) the connexion fuses )

    WOW !

    So much for IEC standardization. 

    To me that, and more important , to  IEC 60364   would be  TNC-s, namely TNC on the big side, and s on the small side.


    Interessant zu lesen aber.


  • It's not just the Swiss that are confused on that point - it's only with the 18th Ed have we got rid of the phrase "The usual form of TN-C-S is as show, where the supply is TN-C and the arrangement in the installation is TN-S."  from fig 3.9 of BS 7671 (my emphasis).


      - Andy.