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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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  • 0
    Are there any earth leakage (protective conductor) currents to take into account? Mineral insulated elements have a bit of a reputation for being a little leaky, and you have quite an amount of them there. On the other hand spread over three phases the leakage should tend to cancel out .... unless there's any option to switch each phase individually (for reduced output for instance).




    Not sure what Protective Conductor means?


    No option to switch each phase, just able to switch individual elements on/off depending on output required, i.e 9kW or 15kW (9kW & 6kW).


    These are the elements I'm looking to install: https://processheatingservices.com/immersion-heaters/screwed-immersion-heaters/industrial-heaters-piirange/


    Cheers, Dan.


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  • 0
    Are there any earth leakage (protective conductor) currents to take into account? Mineral insulated elements have a bit of a reputation for being a little leaky, and you have quite an amount of them there. On the other hand spread over three phases the leakage should tend to cancel out .... unless there's any option to switch each phase individually (for reduced output for instance).




    Not sure what Protective Conductor means?


    No option to switch each phase, just able to switch individual elements on/off depending on output required, i.e 9kW or 15kW (9kW & 6kW).


    These are the elements I'm looking to install: https://processheatingservices.com/immersion-heaters/screwed-immersion-heaters/industrial-heaters-piirange/


    Cheers, Dan.


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