No - I'm trying to get you to pay attention.
If I'm a manufacturer buying cable to use inside my product, and I am not providing extra layers of insulation or sleeving etc then I am going to need the cable I buy in to have double or reinforced insulation, no?
As you know as well as I do, given the totality of your "if" clause, that is obviously correct. However, as has been said, and as you also know as well as I do, if you were that manufacturer there would be options open to you other than buying a cable which had double or reinforced insulation.
Fair enough - but I'm not sure I would go as far as saying that it "showed" that. I doubt that it is the case, but one possibility is that someone wanting to build such a Class II appliance might find that such cables did not exist (or were very hard to find), and that they would therefore have to adopt some other approach in order to satisfy the requirements for a Class II item.
It is the construction of your appliance and not the cable which mean it isn't Class II. Class II appliances with metal casing certainly exist, but your suggestion does not seem to be the way of achieving it.
I don't know whether there are any other relevant Standards which are more explicit but, as so often, BS7671 does not define what satisfies the requirement for 'double insulation' (or 're-inforced insulation') - but, despite what has been suggested here, I imagine that many/most people would regard standard 'insulated and sheathed' cable as satisfying the requirement.
I realise that - but I am (again) pointing out that it's very possible (I would say probable) that I&S cables would satisfy the DI requirements for a Class II appliance (if only we knew what those requirements actually were!).
That is what has been suggested. However, I suspect that it would be quite difficult to 'design' a PVC sheath that did not have at least as good insulating properties as did the underlying PVC insulation, even if one wanted to!
Do you mean a place which (by analogy with the real 'combustion chamber') was only available to 'registered electricians' (I guess 'scheme members')? If so, I suspect that it would be a very quiet place, since the majority of regular (and/or prolific) contributors (of both on-topic and off-topic material) to the forum would be excluded!
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