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Behind skirting board is a no no I think, unless shielded. @Nef
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Skirting is a no I’m pretty sure with regards to safe zones.
Under the floor mat be less hassle than you realise - depending on layout and how cunning the installers are with cable fishing tactics.
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It's a no as others have said. The level of shielding required to provide mechanical protection is generally outside of the domestic arena.
Lots of people do it though. If you did it in armoured it would be pretty safe, you're not allowed to though.
The skirting boards with recesses for wires exist for ethernet and telephone cables, extra low voltage led wires etc.
Bit of a different one, I'm getting an electric vehicle charger installed and want to keep any internal cabling as tidy a possible, for a lot of it the cabling will pass through the kitchen under the cabinets and behind the dish washer / washing machine. However, it will have to pass through the cloak room / WC under the stairs and I this is where I need help, initially I thought about putting it under the floor but the amount of hassle that would cause is too much for me to bear, installing some kind of cable tidy above the skirting is a no go so I'm now looking at behind the skirting board. I'm just wanting to know if this is a no go / within regs etc. It'll be a 32amp / 7kw supply which is higher than average so not sure if I'll be allowed to do this? I know the chaps installing will know but would rather know my option prior to them showing up.