ANOTHER UPDATE -
Did anyone get on the phone to NAPIT about this and report this thread?
The person I spoke to on the phone called me back yesterday afternoon out of the blue and said he reviewed our conversation on Tuesday with a colleague as it was recorded and wanted to go through what we said.
Basically from saying on Tuesday the depth makes it OK yesterday he just said plain and simple it is NOT compliant and this is why -
"The NYY cable range includes NYY-J and NYY-O cables. These are widely used European power and control cables designed for
fixed wiring installation with a voltage rating of 600/1000V. They can be safely deployed in most applications where mechanical stresses are not anticipated – indoors, outdoors, direct burial underground, in concrete, or submerged in water. When NYY cables are required to comply with the UK wiring regulations BS7671 for burial in the ground, they require installation in a conduit or duct to provide protection against mechanical damage. They are not suitable for installation in concrete which is shaken, vibrated or compressed.
NYY-J & NYY-O Cable | Eland Cables - https://www.elandcables.com/cables/nyy-j-pvc-pvc-0-6-1kv-power-cable"
When my NAPIT electrician comes to replace the SWA I will be confronting him about this. I will present this email from NAPIT to the electrician. At the moment I have to assume my electrician is misunderstanding the regulations. If I get any sense that he has put this NYY cable in because he was lazy (I know its more hassle to bend and gland SWA's) and has knowingly signed off this installation as safe and conforming with regualtions I will be putting in a formal complaint to NAPIT.