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rickyd

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    Do i need to have RCD protection on all of the 3 phase sockets





    Depends on the rating of the sockets - up to & including 32A then yes you'd need 30mA RCD protection (or a written risk assessment showing that it's not needed). The regulation doesn't discriminate on how many phases are present.

     

    Also the board currently supplies a 3 phase compactor outside of the workshop via a socket- Am i right in saying if i replace the socket with an isolator and hardwire it this will negate the need for a RCD.



    What's the nature of this 'compactor'? If it's "mobile" then it'll still need 30mA RCD protection regardless of its method of connection.


      - Andy.
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    I am the engineering manager at a bakery and we are planning to re-wire our work shop........ .. I'm trying to design it in such a way that doesn't require me needing a board twice the size we have in place at the moment.   



     


     


    Who is it that is going to do the electrical work and are you the designer?




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    3 phase (4 pole ) RCBOs exist combining an RCD and MCB function,

    Doepke certainly do them  example , as I think do Hagar  (in some configurations).

    When I last looked the Schneider Siemens derived solution was a to suggest a 3 phase MCB, plus an external shunt trip driven by a VIGI

    configured as a residual current sensor, which in comparison is a bit primitive.

    Since then ABB have released  these
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    Its probably going to be easier, and more compact, to incorporate the RCD protection in socket end of the installation
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    mapj1:

    3 phase (4 pole ) RCBOs exist combining an RCD and MCB function,

    Doepke certainly do them  example , as I think do Hagar  (in some configurations).

    When I last looked the Schneider Siemens derived solution was a to suggest a 3 phase MCB, plus an external shunt trip driven by a VIGI

    configured as a residual current sensor, which in comparison is a bit primitive.

    Since then ABB have released  these




    If you don't have an RCD incomer, then you need an outgoing RCBO. Eaton make them, and as Mike suggests, Schneider requires you to combine the RCD and overload components. Either way, they are not cheap.

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    You may RCD at the socket, if you wish to and if the wiring from the main board to that point does not need an RCD - SWA or singles in  steel conduit would not for example. It could be the local isolation.

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    mapj1:

    You may RCD at the socket, if you wish to and if the wiring from the main board to that point does not need an RCD - SWA or singles in  steel conduit would not for example. It could be the local isolation.




    Of course, but if you have more than one socket on a circuit, that gets even more expensive.

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