===== Permitted cable routes in Walls =====
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This diagram shows the prescribed safe zones for concealed cables in walls.
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[img]http://i69.photobucket.com/albums/i62/RFLighting/safezones.jpg[/img]
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If a cable is run outside of the zones shown with green and blue then it must either be buried to a dept of 50mm or more below the finished wall surface, or comply with regulation 522-06-06 parts (i), (ii), & (iii) (see below)
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If the wall is 100mm or less thick then the safe zone also extends to the other side of the wall as shown here in more detail
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[img]http://i69.photobucket.com/albums/i62/RFLighting/text.jpg[/img]
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Also an external link to have a browse through:
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http://www.tlc-direct.co.uk/Book/4.4.1.htm\\ -Guide to the 16th Edition IEE Regulations 4.4 - Cable supports, joints and terminations: