LSpark
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A few issues are firstly it actualy stretches the copper and therefor weakens it and this also affects it's electrical integrity, earthing conductors can then break when detatched or untwisted, this depending how much it has been twisted. it also goes on to make it difficult for fault finding and testing purposes.
If found it should be sleeved seperatly as intended, however it's not the most dangerous thing that can be found, however it is considered bad practise now and sould be totally avoided.
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