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Do-It-Yourself (DIY) Question & Answer Forum
Split Concentric advice
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<blockquote data-quote="Andy™" data-source="post: 71522" data-attributes="member: 2012"><p>DNO commonly use straight concentric. this has a central live core, and unsheated outer cores used to neutral&amp;earth. you can only get TT or PME from this cable, so cant be used under 7671</p><p></p><p>Split concentric is slightly different. it has a central live core, and surrounded by uninsulated cores for earth part way, and insulated cores for neutral the rest of way. this is sometimes used by DNO for TNS, and there is nothing wrong with using it for7671 wiring. can be easier than SWA for many things, just it doesnt give the full protection that SWA does</p><p></p><p>to terminate, simply strip outer black sheath, and seperate neutral &amp; earths and continue as nomal T&amp;E (just you have more cores for neutral &amp; earth. you will need a large size sleeving for earth, or split it into 2 and stick into terminals as normal</p><p></p><p>you can get heatshrink breakouts which cover where the outer sheath is removed, but there is no need to use it. it can safely be terminated direct into a normal CU, just make sure outer sheath is exposed inside the CU like you would any other cable</p></blockquote><p></p>
[QUOTE="Andy™, post: 71522, member: 2012"] DNO commonly use straight concentric. this has a central live core, and unsheated outer cores used to neutral&earth. you can only get TT or PME from this cable, so cant be used under 7671 Split concentric is slightly different. it has a central live core, and surrounded by uninsulated cores for earth part way, and insulated cores for neutral the rest of way. this is sometimes used by DNO for TNS, and there is nothing wrong with using it for7671 wiring. can be easier than SWA for many things, just it doesnt give the full protection that SWA does to terminate, simply strip outer black sheath, and seperate neutral & earths and continue as nomal T&E (just you have more cores for neutral & earth. you will need a large size sleeving for earth, or split it into 2 and stick into terminals as normal you can get heatshrink breakouts which cover where the outer sheath is removed, but there is no need to use it. it can safely be terminated direct into a normal CU, just make sure outer sheath is exposed inside the CU like you would any other cable [/QUOTE]
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