Jolyon Lane asks this question, which concerns whether YY control cable (a flexible multi-core cable having Class 5 stranded copper conductors) is acceptable for use in a domestic property. It has been answered by the NICEIC (Theme – Cables, Wiring & Wiring Accessories):
Question: Is there any thing in the regulations that states that you can't wire a domestic property in YY type cable?
Answer: BS 7671 2008 (2011) does not preclude the use of flexible cables - such as YY cable - as fixed wiring in an electrical installation, but they are subject to the requirements of Regulation 521.9.1.
Therefore, you should ensure that the intended cable meets these requirements before installing it.
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