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Should all RCBOs in a CU/DB be Bi directional and Dual Pole

Sergio Fernandez

Should all RCBOs in a CU/DB be Bi directional and Dual Pole, I am mainly talking domestic dwellings but it may also apply to commercial and industrial

The RCBO have electronics which expect the current to flow the correct way

Increased amount of properties with Solar PV, Battery storage/Car To Grid thus back feeding

The increased reporting of Pen faults in street potentially reverse feeding a property via the Earth/CPC

What role the supply characterises have eg TT, TN/TNC/TNCS, IT

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  • Personally, I much prefer DP switching - especially where there's another RCD upstream (fairly common for TT). It's embarrassing to have "isolated" a circuit by its MCB/RCBO, cut through a cable or touch a N to a back box and then have the whole building black out.

       - Andy.

  • in reply to AJJewsbury
    AJJewsbury said:
    cut through a cable

    It took me a while to figure that one out. I was only allowed to isolate the circuit which I was working on, but the joiners, etc. were getting grumpy every time that their saws stopped. 

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  • in reply to AJJewsbury
    AJJewsbury said:
    cut through a cable

    It took me a while to figure that one out. I was only allowed to isolate the circuit which I was working on, but the joiners, etc. were getting grumpy every time that their saws stopped. 

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