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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
    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.)




    Cheers Andy.  Spot on!  I've just double checked the SPNetwork invoice and it is 40kVA TN-C-S.  It's for a Nano/Micro Brewery.  I'm hoping to do a fair amount of the install myself and get a qualified sparky to connect tails, check and test before operation.


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  • 0
    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.)




    Cheers Andy.  Spot on!  I've just double checked the SPNetwork invoice and it is 40kVA TN-C-S.  It's for a Nano/Micro Brewery.  I'm hoping to do a fair amount of the install myself and get a qualified sparky to connect tails, check and test before operation.


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