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Do-It-Yourself (DIY) Question & Answer Forum
exactly what to test replacement cu
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<blockquote data-quote="SPECIAL LOCATION" data-source="post: 3598" data-attributes="member: 250"><p>Hello M8</p><p></p><p>Fundimental rule to remember IS..</p><p></p><p>If you have changed a CU..</p><p></p><p>every circuits charactereistic have been changed.</p><p></p><p>&amp; most likely they have a different fuse protection device which has a different max permited Zs and possibly different current ratings??</p><p></p><p>e.g.</p><p></p><p>5A BS3036 now 6A BSEN60898</p><p></p><p>15A BS3036 now 16A BSEN60898</p><p></p><p>30A BS3036 now 32A BSEN60898</p><p></p><p>Larger meter tails &amp; main earth conductor would also have implication on the actual Zs reading.</p><p></p><p>You must prove that you have reconnected the circuits correctly, no high res joints &amp; correct polarity etc..</p><p></p><p>With regard to Insulation resistance it is often impractical to completely dissconnect everything from a circuit to check all combinations of IR test.</p><p></p><p>It can be permissable to check with L&amp;N joined together with referencxe to earth 'CPC' conductor. and put 'LIM' in boxes for L-N test.</p><p></p><p>You inspector will need to see you reperform some of these tests and check your readings!</p><p></p><p>so try and find an easily accessible / isolatable radial circuit...</p><p></p><p>such as a cooker with socket outlet can be a good one!</p><p></p><p>SL.</p></blockquote><p></p>
[QUOTE="SPECIAL LOCATION, post: 3598, member: 250"] Hello M8 Fundimental rule to remember IS.. If you have changed a CU.. every circuits charactereistic have been changed. & most likely they have a different fuse protection device which has a different max permited Zs and possibly different current ratings?? e.g. 5A BS3036 now 6A BSEN60898 15A BS3036 now 16A BSEN60898 30A BS3036 now 32A BSEN60898 Larger meter tails & main earth conductor would also have implication on the actual Zs reading. You must prove that you have reconnected the circuits correctly, no high res joints & correct polarity etc.. With regard to Insulation resistance it is often impractical to completely dissconnect everything from a circuit to check all combinations of IR test. It can be permissable to check with L&N joined together with referencxe to earth 'CPC' conductor. and put 'LIM' in boxes for L-N test. You inspector will need to see you reperform some of these tests and check your readings! so try and find an easily accessible / isolatable radial circuit... such as a cooker with socket outlet can be a good one! SL. [/QUOTE]
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exactly what to test replacement cu
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