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TN-C-S Pitfalls
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<blockquote data-quote="kelvfoozinda" data-source="post: 251513" data-attributes="member: 16500"><p>When installing new supplies to flats etc we normally would supply a distribution unit with wavecon (like concentric but in massive sizes and a wavey outer copper strands rather than wrapped around). Then split concentric is used from this point to the flats. Split concentric has a separate neutral and earth determined by the neutral strands being further insulated. Therefore your tns supply in the flat is only tns as far as the cupboard down the hall. The same wavecon cable is what is stuck in the road in most new situations, so everything ends up tnc-s.</p><p></p><p>Faults i've seen include three bungalows on the same phase and the neutral drops out in the road, the earth became live and melted in most of the ccts within these three properties, causing an old unsheathed earth stapled to the rafters in one property to char the timber it was clipped to. The lead twin for the lighting ccts to melt and all other manner of stuff to need rewiring!</p><p></p><p>Neutral to drop out intermittently in a substation causing for a tnc-s supply to one half of a block to find a neutral path down an aerial cable through one blokes tv to the other supply to the block, we clamp metered 80A on the co ax before pulling the plug on the TV!</p></blockquote><p></p>
[QUOTE="kelvfoozinda, post: 251513, member: 16500"] When installing new supplies to flats etc we normally would supply a distribution unit with wavecon (like concentric but in massive sizes and a wavey outer copper strands rather than wrapped around). Then split concentric is used from this point to the flats. Split concentric has a separate neutral and earth determined by the neutral strands being further insulated. Therefore your tns supply in the flat is only tns as far as the cupboard down the hall. The same wavecon cable is what is stuck in the road in most new situations, so everything ends up tnc-s. Faults i've seen include three bungalows on the same phase and the neutral drops out in the road, the earth became live and melted in most of the ccts within these three properties, causing an old unsheathed earth stapled to the rafters in one property to char the timber it was clipped to. The lead twin for the lighting ccts to melt and all other manner of stuff to need rewiring! Neutral to drop out intermittently in a substation causing for a tnc-s supply to one half of a block to find a neutral path down an aerial cable through one blokes tv to the other supply to the block, we clamp metered 80A on the co ax before pulling the plug on the TV! [/QUOTE]
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