Published: 21 December 2009
Category: Q&A
Our Voltimum Experts answer your questions on a daily basis in our Technical Expertise area. This one, concerning, a new house of blockwork external walls and its cable runs, is answered by SELECT:
Question: A new house is to be built using solid 215mm blockwork external walls with 100mm phenolic insulation on the outside. The specification calls for minimal internal finish to the blockwork, so any cabling for power points and light switches will have to be chased in and filled, and will probably be visible anyway. It has been suggested that the cables could be run on the outside of the blockwork, under the insulation layer.
Is there any technical or regulatory reason why this should not be done?
Answer: The designer of the installation should ensure that requirements contained in Chapter 52 of BS 7671: 2008 are complied with regarding the suitability of the cable, how it is installed and the external factors likely to affect it. If you meet these, then it should be fine!
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www.voltimum.co.uk/consult.php?universe=consult.index.questions