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Student & Learning Zone - City & Guilds
What fault can turn a TT into a TNCS and disable the RCD?
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<blockquote data-quote="sparkytim" data-source="post: 264123" data-attributes="member: 8627"><p>This was a duel RCD installation and the other RCD tested fine. The interesting thing is that the N-E fault had sat there undetected untill a Zs Test taken during other work set alarm bells ringing.</p><p></p><p>The owner was un-aware that he had caused the problem installing the wall light and the RCD had not tripped on this TT install for the reasons as explained. Had it been TNS or TNC-S then it would have tripped.</p><p></p><p>So as already mentioned NO system is Totally imune to un-safe situations.</p></blockquote><p></p>
[QUOTE="sparkytim, post: 264123, member: 8627"] This was a duel RCD installation and the other RCD tested fine. The interesting thing is that the N-E fault had sat there undetected untill a Zs Test taken during other work set alarm bells ringing. The owner was un-aware that he had caused the problem installing the wall light and the RCD had not tripped on this TT install for the reasons as explained. Had it been TNS or TNC-S then it would have tripped. So as already mentioned NO system is Totally imune to un-safe situations. [/QUOTE]
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Student & Learning Zone - City & Guilds
What fault can turn a TT into a TNCS and disable the RCD?
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