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RCBO In Distribution Board or Isolator With RCD?

Nano Brewery
I'm trying to decide which would be the most suitable and sensible option? 


I have a Control Board that will be switching 4x 3-Phase Immersion Elements.

9kW

9kW

6kW

3kW


Control Board has Rail Mount Fuse Holders & Contactors installed for each circuit.


My question is would it be better to have a suitably rated RCBO installed in the Distribution Board which will be feeding the Control Board or should I go with downstream Isolators with RCD's?  I'm leaning towards the later as I would have separate RCD protection on each circuit.


Look forward to your feedback.  Cheers, Dan.

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    Nano Brewery:

    Andy - Would you personally not bother with RCDs? Cheers.


    Depends on the circumstances, of course. If everything is hard wired (not via plugs & sockets), indoors, cables aren't hidden in walls and nothing goes near a bathroom or other special location, the earthing system is TN, and everything was to a good standard, then they wouldn't have been my first thought. Seeing the setup might change my mind though...

       -  Andy.


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  • 0
    Nano Brewery:

    Andy - Would you personally not bother with RCDs? Cheers.


    Depends on the circumstances, of course. If everything is hard wired (not via plugs & sockets), indoors, cables aren't hidden in walls and nothing goes near a bathroom or other special location, the earthing system is TN, and everything was to a good standard, then they wouldn't have been my first thought. Seeing the setup might change my mind though...

       -  Andy.


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