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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: 262323" data-attributes="member: 8627"><p>So here is another interesting Fault situation.</p><p></p><p>Testing Zs on a TT system socket and gets 1.2 ohms.</p><p></p><p>Ra known to be 64 ohms</p><p></p><p>On testing RCD it fails to trip at 1x, 5x and even with a 25 Amp Loop test, but operates on Test button.</p><p></p><p>What was the fault causing this and why?</p></blockquote><p></p>
[QUOTE="sparkytim, post: 262323, member: 8627"] So here is another interesting Fault situation. Testing Zs on a TT system socket and gets 1.2 ohms. Ra known to be 64 ohms On testing RCD it fails to trip at 1x, 5x and even with a 25 Amp Loop test, but operates on Test button. What was the fault causing this and why? [/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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