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Do-It-Yourself (DIY) Question & Answer Forum
Concerned.
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<blockquote data-quote="la poste" data-source="post: 158437" data-attributes="member: 11452"><p>But one disadvantage of TT is that if for some reason an RCD fails you will have no earth protection.</p><p></p><p>With an earth resistance of 100 ohms an earth fault current would be just over 2 Amps, this would not trip any MCB and any metal would be at 230 volts until someone touched it.</p><p></p><p>RCD's are meant as a backup to MCB's or fuses and not as a primary and only source of earth fault protection.</p><p></p><p>That's the way I was taught anyway.</p></blockquote><p></p>
[QUOTE="la poste, post: 158437, member: 11452"] But one disadvantage of TT is that if for some reason an RCD fails you will have no earth protection. With an earth resistance of 100 ohms an earth fault current would be just over 2 Amps, this would not trip any MCB and any metal would be at 230 volts until someone touched it. RCD's are meant as a backup to MCB's or fuses and not as a primary and only source of earth fault protection. That's the way I was taught anyway. [/QUOTE]
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