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New SWA Supply from DNO Isolator to Upper Flat
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<blockquote data-quote="Right Spark" data-source="post: 503642" data-attributes="member: 33318"><p>guidance from the Electricity Safety Council says "installing such cables in this way (external cavity walls) is generally an undesirable practice" </p><p> </p><p> Reasons: </p><p></p><p>Obstructions in a cavity wall, such create a risk of unseen damage during installation.</p><p> </p><p> Long unsupported vertical drops may place undue strain on the </p><p> conductors, leading to damage - Not applicable really in this case, but still.</p><p> </p><p> Polystyrene used for insulation, if it come into contact with thermoplastic (pvc) cable sheathing, plasticiser can migrate from the thermoplastic to the polystyrene </p><p> </p><p> Thermal insulation in the cavity may cause cable not to be able to carry the load current without overheating due to their current-carrying capacity being reduced.</p><p> </p><p> Presence of flora and fauna - unforeseen external influences.</p><p> </p><p> </p><p> </p><p> Building Regulations 2000 and NHBC Standards state that no cables other than electricity meter tails are to be located in the cavity of an external wall.</p><p></p><p>sorry, I’ve never in my 25 year career wired anything in The cavity of a building and I’m not about to start now.</p><p> </p></blockquote><p></p>
[QUOTE="Right Spark, post: 503642, member: 33318"] guidance from the Electricity Safety Council says "installing such cables in this way (external cavity walls) is generally an undesirable practice" Reasons: Obstructions in a cavity wall, such create a risk of unseen damage during installation. Long unsupported vertical drops may place undue strain on the conductors, leading to damage - Not applicable really in this case, but still. Polystyrene used for insulation, if it come into contact with thermoplastic (pvc) cable sheathing, plasticiser can migrate from the thermoplastic to the polystyrene Thermal insulation in the cavity may cause cable not to be able to carry the load current without overheating due to their current-carrying capacity being reduced. Presence of flora and fauna - unforeseen external influences. Building Regulations 2000 and NHBC Standards state that no cables other than electricity meter tails are to be located in the cavity of an external wall. sorry, I’ve never in my 25 year career wired anything in The cavity of a building and I’m not about to start now. [/QUOTE]
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