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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
    As I understand it SPNetworks have installed a TNS System. They have connected via the sub-station down the road. I have a Earth Terminal Block to connect to - Do this sound right?

    If you're using the supplier's earthing facility it'll certainly be TN. (I'd be surprised if it was really TN-S these days (unless it was an odd situation like a caravan site or a marina) - most DNOs seem pretty wedded to TN-C-S these days, even combining N and PE in modification to what were originally TN-S networks, effectively making them TN-C-S even though they appear for all the world to be TN-S at the cut-out.)

     
    I would need the other 3 Immersions to remain connected if 1 develops a fault.

    Then no common RCD then - which leaves you with a choice of individual RCD (RCCBs or RCBOs) for each circuit, or no RCDs at all - so back to the 1st question on that.


      - Andy.
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  • 0
    As I understand it SPNetworks have installed a TNS System. They have connected via the sub-station down the road. I have a Earth Terminal Block to connect to - Do this sound right?

    If you're using the supplier's earthing facility it'll certainly be TN. (I'd be surprised if it was really TN-S these days (unless it was an odd situation like a caravan site or a marina) - most DNOs seem pretty wedded to TN-C-S these days, even combining N and PE in modification to what were originally TN-S networks, effectively making them TN-C-S even though they appear for all the world to be TN-S at the cut-out.)

     
    I would need the other 3 Immersions to remain connected if 1 develops a fault.

    Then no common RCD then - which leaves you with a choice of individual RCD (RCCBs or RCBOs) for each circuit, or no RCDs at all - so back to the 1st question on that.


      - Andy.
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