Our Voltimum Experts answer your questions on a daily basis in our Technical Expertise area. This one, concerning TN-C earthing systems and RCDs, is answered by Eaton MEM:
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Question: Why can't I use an RCD in a TN-C earthing system?
Answer: In TN-C (and IT) networks, residual current devices (RCDs) are far less likely to detect an insulation fault. In a TN-C system they would also be very vulnerable to unwanted triggering from contact between earths of circuits on different RCDs or with real ground, so making their use impractical.
To see many more Q & A in Voltimum UK's Experts Area, please click on the link: www.voltimum.co.uk/consult.php?universe=consult.index.questions
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