For inspection purposes, I'll admit maybe not in this case as its 3 core.
But whichever way we look at it it's still the wrong cable.
I`d think twice before calling it "The wrong cable" .
I was once on a council grant job, some wiring for an electric shower, and the customer stated that the previous electrician had "installed the wrong cable" on part of a previous job.
I had a quick glance and said "who told you that?". He replied "The Grants Officer".
A few days later I saw the grants officer and during in the conversation I mentioned this item asking what he had said to the customer. He said he had remarked about a circuit having 4.0 T & E where only 2.5 was actually required so he said "Oh he`s used 4.0 instead of 2.5" , as I had suspected he had said something like that. He was actually a bit impressed that the previous electrician had not just stuck to the bare minimum as many would do but had done something a little better.
The customer had had completely mistranslated his remarks to become "wrong cable" rather than above the minimum required.
Speaking of mistranslations, a couple I know split up, they had small children, they had remarked to their dad that their mum let them play in the loft, hmm dangerous! He mentioned it to Mum and she denied it although later on they informed him mum had told them off ans still let them play in the loft. Thinking of the potential for great harm to his kids he contacted the local council. A few weeks later he was a bit unhappy that the council "Had taken her word for it". He had the letter on him so I asked if I could see it.
It was an informal letter with a technically correct wording and basically the inspector had noted the mum had someone board the loft out not to let the kids play in it but to store a few items, his comments were such that the result was a floor far stronger than need be for such storage use .
I said to him "Read that letter again but this time consider if the inspector is telling you that the job is far more than adequate for what she stated and although he could not state such in the letter that his suspicions were that yes she has strengthen it enough to allow the kids to play up there without due regard to the risk of them falling into the bathroom whilst up a loft ladder for access or merely falling thru an open loft hatch".
In other words the inspector clearly had the opinion that her stated reason for the flooring was a right load of boldylollocks.
Mum duly stopped the kids going up the loft, telling them "Your Dad has spoilt this for you by reporting it to the council, you can not go up there anymore!"