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Do-It-Yourself (DIY) Question & Answer Forum
To bond or not to bond, that is the question
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<blockquote data-quote="apprentice87" data-source="post: 442870" data-attributes="member: 13534"><p>As Andy said. If is it bolted to the ground, then it is most likely extraneous. As Andy ALSO said, if it is common to next door, it could also introduce a potential. If something conductive does "go next door" the potential that could be introduced to YOUR area might not just be earth potential, or even a differing earth potential, but it could be at anything up to full mains voltage if there is a fault...</p><p></p><p>As well as this, it could introduce a potential even if there is no fault whatsoever.</p><p></p><p>Imagine that you and next door are both on TNCS. Your metal work is bonded to your MET, and their metal work is bonded to their MET. You are nearer to the mains in the street then them and therefore your neutral has a lower impedance than theirs. You touch their metal work AND yours, and YOU are now part of, [in parallel with] their neutral.... Oooeerrrr...</p><p></p><p>john..</p></blockquote><p></p>
[QUOTE="apprentice87, post: 442870, member: 13534"] As Andy said. If is it bolted to the ground, then it is most likely extraneous. As Andy ALSO said, if it is common to next door, it could also introduce a potential. If something conductive does "go next door" the potential that could be introduced to YOUR area might not just be earth potential, or even a differing earth potential, but it could be at anything up to full mains voltage if there is a fault... As well as this, it could introduce a potential even if there is no fault whatsoever. Imagine that you and next door are both on TNCS. Your metal work is bonded to your MET, and their metal work is bonded to their MET. You are nearer to the mains in the street then them and therefore your neutral has a lower impedance than theirs. You touch their metal work AND yours, and YOU are now part of, [in parallel with] their neutral.... Oooeerrrr... john.. [/QUOTE]
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Do-It-Yourself (DIY) Question & Answer Forum
To bond or not to bond, that is the question
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