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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

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  • Alternating current.

  • in reply to geoffsd

    Agreed.

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

    The current flows in both directions all the time in any event. As far as I can tell, whether it's in sync with the voltage or 180 degrees out of phase (plus or minus a bit), isn't likely to worry most mechanisms. There can be an issue where the voltage on the "load" terminals doesn't disappear when the device opens - e.g. where the test circuit is simply connected across the load terminals if someone holds in the T button after the device trips then the test current continues to flow and the resistor and/or solenoid and can burn out, possibly permanently damaging the device. I'd be interested if anyone know of any other failure scenarios ...

       - Andy.

Reply
  • in reply to geoffsd

    Agreed.

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

    The current flows in both directions all the time in any event. As far as I can tell, whether it's in sync with the voltage or 180 degrees out of phase (plus or minus a bit), isn't likely to worry most mechanisms. There can be an issue where the voltage on the "load" terminals doesn't disappear when the device opens - e.g. where the test circuit is simply connected across the load terminals if someone holds in the T button after the device trips then the test current continues to flow and the resistor and/or solenoid and can burn out, possibly permanently damaging the device. I'd be interested if anyone know of any other failure scenarios ...

       - Andy.

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