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Why RCD is unallowed in TNC system? I think it is useful for preventing indirect electric shock

Former Community Member
Former Community Member
Why RCD is unallowed in TNC system? I think it is useful for preventing indirect electric shock. For example when a fault happens (phase to metal body) and a person contacts the metal body, current flows from his body and goes to the earth. So Unbalancing current of phase and PEN inside of RCD make it to be triped.
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    I am not allowed to install a TNC system in the UK.


    A RCD cannot work on a TNC system until the earth is separated, which is how it is done elsewhere in the world.


    Andy Betteridge
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    I am not allowed to install a TNC system in the UK.


    A RCD cannot work on a TNC system until the earth is separated, which is how it is done elsewhere in the world.


    Andy Betteridge
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