As I keep trying to explain, it's nothing to do with whether you (or any of us) have any personal confusion about such things - it's is about what regulations do and do not consider to be part of an 'electrical installation'
On that basis perhaps you could expand your list with concise demarcation descriptions please.
I consider an electrical installation to be the fixed wiring + fixed appliances (wired in appliances )
Fair enough - I imagine that many/most people (including myself) would feel that was fairly close to 'common sense' - although I do have to wonder whether it really is totally sensible that, say, an oven, heater, saw table etc. changes from 'portable appliance' to 'part of the electrical installation' if they are connected via an FCU rather than a plug/socket. In terms of everyday language, I suspect that many (most?) people would say that none of those bits of equipment were really 'portable' on the basis of their size/weight, regardless of how they were supplied with electricity?
This is where I think the problem arises. You have no 'confusion' about these issues because you are attempting to apply common sense, but the regs are not necessarily as sensible as you. A mobile home or an outbuilding are (collections of) 'current using equipment' - and a mobile home is, at least in some senses, 'portable' (in that it can be 'moved') - and we don't know 'how sensible' the regs are trying to be because they do not explicitly address these questions.
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