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Rerouting Not Rewiring Cables - Need To Be Signed Off?
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<blockquote data-quote="Risteard" data-source="post: 477487" data-attributes="member: 2666"><p>Where are these guidelines? I haven't seen them. After all, it is for the Inspector to determine when the next periodic inspection should be having regard for the condition of the electrical installation. Indeed, the Inspector may state that the installation should be re-inspected in six months time - and indeed this is something I have done on occasion.</p><p></p><p>The limit is actually one Megohm (with further investigation below two being subject to further investigation).</p><p></p><p>It must, however, be remembered that the minimum values of insulation resistance are for the <u><strong>electrical installation</strong></u> - or in larger installations a distribution board with all final circuits connected. If testing individual circuits then the effects of resistances in parallel must be considered (1/Rt = 1/R1 + 1/R2 etc.) - this is a requirement of the Wiring Regulations. This is why, where practicable, I always conduct a global test of insulation resistance. In fact RECI (the Regulatory Body in the south of Ireland) insist on the test being carried out this way when inspecting contractors' work, and rightly so as this is the rule in ET101 - however, as pointed out, it is also the requirement in BS7671.</p></blockquote><p></p>
[QUOTE="Risteard, post: 477487, member: 2666"] Where are these guidelines? I haven't seen them. After all, it is for the Inspector to determine when the next periodic inspection should be having regard for the condition of the electrical installation. Indeed, the Inspector may state that the installation should be re-inspected in six months time - and indeed this is something I have done on occasion. The limit is actually one Megohm (with further investigation below two being subject to further investigation). It must, however, be remembered that the minimum values of insulation resistance are for the [U][B]electrical installation[/B][/U] - or in larger installations a distribution board with all final circuits connected. If testing individual circuits then the effects of resistances in parallel must be considered (1/Rt = 1/R1 + 1/R2 etc.) - this is a requirement of the Wiring Regulations. This is why, where practicable, I always conduct a global test of insulation resistance. In fact RECI (the Regulatory Body in the south of Ireland) insist on the test being carried out this way when inspecting contractors' work, and rightly so as this is the rule in ET101 - however, as pointed out, it is also the requirement in BS7671. [/QUOTE]
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