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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
    Not sure what Protective Conductor means?

    The one that's there just for protecting against electric shock - usually coloured green/yellow - in olden days used to be referred to as the "earth" wire.

    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.

    There's an old addage that quality (or safety) can't be just tested-in - it has to be designed-in and built-in. And there's more to that than just chucking RCDs at the problem and hoping for the best. It's sounding like an unusual situation with perhaps more liquid and a lot more metalwork than a typical domestic. Industrial systems perhaps tend to rely more on solid earthing and bonding rather than RCDs. Certainly get someone else involved if you don't have all the requisite skills - but I'd get them involved at the start of the process rather than the end - and make sure it's someone who's familiar with that kind of installation - many a domestic electrician who hold all the qualifications for that end of the market might be quite out of their depth with something more unusual.


       - Andy.
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  • 0
    Not sure what Protective Conductor means?

    The one that's there just for protecting against electric shock - usually coloured green/yellow - in olden days used to be referred to as the "earth" wire.

    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.

    There's an old addage that quality (or safety) can't be just tested-in - it has to be designed-in and built-in. And there's more to that than just chucking RCDs at the problem and hoping for the best. It's sounding like an unusual situation with perhaps more liquid and a lot more metalwork than a typical domestic. Industrial systems perhaps tend to rely more on solid earthing and bonding rather than RCDs. Certainly get someone else involved if you don't have all the requisite skills - but I'd get them involved at the start of the process rather than the end - and make sure it's someone who's familiar with that kind of installation - many a domestic electrician who hold all the qualifications for that end of the market might be quite out of their depth with something more unusual.


       - Andy.
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