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Electrician Talk Forum
New outbuilding/ house is on TT
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<blockquote data-quote="apprentice87" data-source="post: 444354" data-attributes="member: 13534"><p>Ok....</p><p></p><p>Well, i shall just add my unqualified welders opinion....</p><p></p><p>I would keep them separate for the following reasons;</p><p></p><p>1, Rcd's are lettuced.. [I think all will agree with that]</p><p></p><p>2, Yes, by having two rods linked you may well improve Ra somewhat, but what will you REALLY gain?? Ra will be already be low enough with just the one rod to operate the RCD, but even with TWO rods, will not be low enough to operate an MCB.</p><p></p><p>So.... you have an earth fault in the one installation, [and the rcd decides not to work] and you have "exported" the resultant all exposed conductive parts live, plus anything bonded to the MET now also live, to the other installation too... and ADS will not work either..</p><p></p><p>Why would you want to risk that for no real gain??</p><p></p><p>john..</p></blockquote><p></p>
[QUOTE="apprentice87, post: 444354, member: 13534"] Ok.... Well, i shall just add my unqualified welders opinion.... I would keep them separate for the following reasons; 1, Rcd's are lettuced.. [I think all will agree with that] 2, Yes, by having two rods linked you may well improve Ra somewhat, but what will you REALLY gain?? Ra will be already be low enough with just the one rod to operate the RCD, but even with TWO rods, will not be low enough to operate an MCB. So.... you have an earth fault in the one installation, [and the rcd decides not to work] and you have "exported" the resultant all exposed conductive parts live, plus anything bonded to the MET now also live, to the other installation too... and ADS will not work either.. Why would you want to risk that for no real gain?? john.. [/QUOTE]
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