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Do-It-Yourself (DIY) Question & Answer Forum
New consumer unit - testing existing circuits
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<blockquote data-quote="davetheglitz" data-source="post: 144174" data-attributes="member: 173"><p>My understanding is as follows:-</p><p></p><p>As an electrician you undertake to leave the system in a safer condition than when you started work on it.</p><p></p><p>When replacing a CU you need to be sure:-</p><p></p><ul> <li data-xf-list-type="ul">All circuits are correctly fused for the wiring. If a ring circuit then is being supplied this means doing ring continuity.<br /> </li> <li data-xf-list-type="ul">Earth continuity has not been compromised - hence R1 + R2<br /> </li> <li data-xf-list-type="ul">RCD's trip within appropriate time at the required current. To this extent insulation measurements are well worthwhile.<br /> </li> <li data-xf-list-type="ul">Earthing is to the latest standard (remember the Adiabatic equation - it's not always 16mm)<br /> </li> <li data-xf-list-type="ul">Bonding is in place - ideally upgraded to the 17th edition - if not then justify why not - eg 10mm to gas, 6mm to water - however cross bonded at boiler via metal manifold. Continuity gas to water verified. <br /> </li> </ul><p></p><p>In effect this means doing the electrical testing associated with a PIR but not the inspection side. To hold you responsible for the whole installation is a bit ridiculous - even on a PIR it would be very easy to miss a borrowed neutral - in fact hard to pick one up - but you need to show that you haven't compromised what was already there.</p><p></p><p>If there are any faults on the existing system these should be highlighted.</p><p></p><p>If there are any aspects not to current regs - cover in your paperwork.</p><p></p><p>You are only certifying the work that you have done - which is changing the CU.</p></blockquote><p></p>
[QUOTE="davetheglitz, post: 144174, member: 173"] My understanding is as follows:- As an electrician you undertake to leave the system in a safer condition than when you started work on it. When replacing a CU you need to be sure:- [LIST][*]All circuits are correctly fused for the wiring. If a ring circuit then is being supplied this means doing ring continuity. [*]Earth continuity has not been compromised - hence R1 + R2 [*]RCD's trip within appropriate time at the required current. To this extent insulation measurements are well worthwhile. [*]Earthing is to the latest standard (remember the Adiabatic equation - it's not always 16mm) [*]Bonding is in place - ideally upgraded to the 17th edition - if not then justify why not - eg 10mm to gas, 6mm to water - however cross bonded at boiler via metal manifold. Continuity gas to water verified. [/LIST] In effect this means doing the electrical testing associated with a PIR but not the inspection side. To hold you responsible for the whole installation is a bit ridiculous - even on a PIR it would be very easy to miss a borrowed neutral - in fact hard to pick one up - but you need to show that you haven't compromised what was already there. If there are any faults on the existing system these should be highlighted. If there are any aspects not to current regs - cover in your paperwork. You are only certifying the work that you have done - which is changing the CU. [/QUOTE]
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New consumer unit - testing existing circuits
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