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Three Phase RCD & MCB Wiring?

Nano Brewery
Please could somebody advise on the most cost effective procedure of wiring up RCDs & MCBs on a DIN Rail for independent circuit protection.  Tried Googling to no joy.  Plenty of Single Phase advice, images, videos.  If using 4 Pole MCBs & RCDs, would I be correct in assuming that similar to single phase, it's just a case of Busbar-ing the MCB Lives to the RCD Lives and taking the RCD to Neutral Bar?


Have seen diagrams (like below) where the Incoming L1, L2, L3 get split to separate DP MCBs, RCDs and SP MCBs for each phase.  Seems like a bit of a faff and a pricey option (3x DP MCBs + 3x RCDs + 3x SP MCBs) per circuit.


I have 3x Three Phase Circuits (13A, 40A, 48A) that I wish to protect independently with RCDs.


Thanks in advance!  Dan.

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  • 0
    OlympusMons:

    Dan, do you need to have RCD protection for the whole of each circuit? Or just near the ends? It might be better to get a quote to install three 3-phase RCCBs near the ends of your circuits.




    The 48A Circuit will be feeding a Control Panel which in turn will be switching 4x individual 3-phase Immersion Elements.  So that would require 4x RCCB Sockets/Plugs.  Quite a pricey option.


    The 40A Circuit will be feeding a 3-phase Instant Hot Water Heater.


    The 13A Circuit will be feeding a 3-phase Pump.


    Cheers.


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  • 0
    OlympusMons:

    Dan, do you need to have RCD protection for the whole of each circuit? Or just near the ends? It might be better to get a quote to install three 3-phase RCCBs near the ends of your circuits.




    The 48A Circuit will be feeding a Control Panel which in turn will be switching 4x individual 3-phase Immersion Elements.  So that would require 4x RCCB Sockets/Plugs.  Quite a pricey option.


    The 40A Circuit will be feeding a 3-phase Instant Hot Water Heater.


    The 13A Circuit will be feeding a 3-phase Pump.


    Cheers.


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