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The article Which RCD Type? from the Institution of Engineering and Technology introduces Selectivity (Discrimination) when installing multiple RCD in series.
The question is, will a householder be protected by a Type AC RCBO in the consumer unit which then supplies a 2 Pole Type A/B RCCB positioned local to a GTI or inverter? The way I see this is that the RCBO is protected from DC currents by the local RCCB which would sense the presence of DC currents and trip before the RCBO became locked up or blinded.
Which highlights the danger of connecting GTI to consumer units protected only by Type AC RCD. There are a lot of them out there and electricians should be especially aware that a blinded RCD would not trip if an electrocution was in progress something that might later result in a fatality.
The question is, will a householder be protected by a Type AC RCBO in the consumer unit which then supplies a 2 Pole Type A/B RCCB positioned local to a GTI or inverter? The way I see this is that the RCBO is protected from DC currents by the local RCCB which would sense the presence of DC currents and trip before the RCBO became locked up or blinded.
Which highlights the danger of connecting GTI to consumer units protected only by Type AC RCD. There are a lot of them out there and electricians should be especially aware that a blinded RCD would not trip if an electrocution was in progress something that might later result in a fatality.