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Adding an Earth Rod on a TN system and BS7671
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<blockquote data-quote="PBC_1966" data-source="post: 116232" data-attributes="member: 7302"><p>Only just noticed this thread following on from the other one.</p><p></p><p>I've voted yes, it's allowed. To summarize my take on it:</p><p></p><p>* I do not read anything into 542.1 which says it can't be done.</p><p></p><p>* You don't need a regulation to say explicitly that you <em>can</em> do it; like the law, if there's nothing to say it's prohibited, then it's permissible by default.</p><p></p><p>* Connecting a purpose-made electrode to the system is electrically no different from bonding a buried metallic water pipe, so for the regs. to allow one but prohibit the other would make no sense.</p><p></p><p>* Electrically speaking, arguments over whether the rod is connected directly to the supplier's neutral at the cut-out or to the consumer's MET all of 6 inches away are quite pointless since the two are solidly connected together.</p><p></p><p>* Long before the days of the Wiring Regs. becoming BS7671, it was actually <em>recommended</em> that an additional earth rod be used as an extra safeguard.</p><p></p><p>* It is standard practice (and required by codes) to provide such an electrode in other countries.</p></blockquote><p></p>
[QUOTE="PBC_1966, post: 116232, member: 7302"] Only just noticed this thread following on from the other one. I've voted yes, it's allowed. To summarize my take on it: * I do not read anything into 542.1 which says it can't be done. * You don't need a regulation to say explicitly that you [I]can[/I] do it; like the law, if there's nothing to say it's prohibited, then it's permissible by default. * Connecting a purpose-made electrode to the system is electrically no different from bonding a buried metallic water pipe, so for the regs. to allow one but prohibit the other would make no sense. * Electrically speaking, arguments over whether the rod is connected directly to the supplier's neutral at the cut-out or to the consumer's MET all of 6 inches away are quite pointless since the two are solidly connected together. * Long before the days of the Wiring Regs. becoming BS7671, it was actually [I]recommended[/I] that an additional earth rod be used as an extra safeguard. * It is standard practice (and required by codes) to provide such an electrode in other countries. [/QUOTE]
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Adding an Earth Rod on a TN system and BS7671
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