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Do-It-Yourself (DIY) Question & Answer Forum
RCD tripping more since route of supply changed!
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<blockquote data-quote="SPECIAL LOCATION" data-source="post: 81126" data-attributes="member: 250"><p>Hi Monkey <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big grin :D" loading="lazy" data-shortname=":D" /> </p><p></p><p>This is where Knowledge of the layout of the particular installation comes in to its own...</p><p></p><p>Basic concept:</p><p></p><p>1/</p><p></p><p>Any Residual earth fault current MUST by its very nature be flowing to earth.</p><p></p><p>2/</p><p></p><p>Hopefully this earth path is down though the main earth terminal..</p><p></p><p>e.g.</p><p></p><p>Incoming Cable sheath {TNS}</p><p></p><p>Strapped Earth+N at supply head {TN-C-S}</p><p></p><p>Down the rod {TT}</p><p></p><p>BUT... there could possibly be parallel paths down water / Gas metal pipes! <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite3" alt=":(" title="Frown :(" loading="lazy" data-shortname=":(" /> </p><p></p><p>3/</p><p></p><p>You need to find an accessible point between</p><p></p><p>(a) the earth bar in CU where all the circuit CPC's terminate and</p><p></p><p>(B) the main earth terminal/Rod/Sheath/PME joint/Parallel path.</p><p></p><p>4/</p><p></p><p>If all of your earth bonding cables come onto the main earth bar in CU</p><p></p><p>this could be the place to do the biz.</p><p></p><p>5/</p><p></p><p>If you have an accessible external earth block adjacent to the CU &amp; head,</p><p></p><p>this would be an easier point IMHO! <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink ;)" loading="lazy" data-shortname=";)" /> </p><p></p><p>6/</p><p></p><p>On some really badly designed &amp; laid-out installations, it may not have any suitable practical place to access or get your meter in to get any readings.</p><p></p><p>7/</p><p></p><p>But if you can do it you need to break in-between the point(s) where current can get to physical earth and the common connection where all circuit CPC's terminate!</p><p></p><p>HTH</p><p></p><p> ; )Guiness DrinkGuiness Drink</p></blockquote><p></p>
[QUOTE="SPECIAL LOCATION, post: 81126, member: 250"] Hi Monkey :D This is where Knowledge of the layout of the particular installation comes in to its own... Basic concept: 1/ Any Residual earth fault current MUST by its very nature be flowing to earth. 2/ Hopefully this earth path is down though the main earth terminal.. e.g. Incoming Cable sheath {TNS} Strapped Earth+N at supply head {TN-C-S} Down the rod {TT} BUT... there could possibly be parallel paths down water / Gas metal pipes! :( 3/ You need to find an accessible point between (a) the earth bar in CU where all the circuit CPC's terminate and (B) the main earth terminal/Rod/Sheath/PME joint/Parallel path. 4/ If all of your earth bonding cables come onto the main earth bar in CU this could be the place to do the biz. 5/ If you have an accessible external earth block adjacent to the CU & head, this would be an easier point IMHO! ;) 6/ On some really badly designed & laid-out installations, it may not have any suitable practical place to access or get your meter in to get any readings. 7/ But if you can do it you need to break in-between the point(s) where current can get to physical earth and the common connection where all circuit CPC's terminate! HTH ; )Guiness DrinkGuiness Drink [/QUOTE]
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RCD tripping more since route of supply changed!
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