Here is a ring
but not as you know it. We are not looking on how electric works, we are looking at use of English, if some thing changes it can be said it has been transformed, this is the English, but in electrical circles we consider a transformer to be wire wound device, clearly a device which replaces the wire wound device is in English still a transformer, but we need some way to separate the two devices, so convention it seems is to all the word electronic.
So we have English words which are used in the electrical trade which we see as electrical words, but Joe public still see as English words, ballast, lamp, bulb, low voltage, extra low voltage, power supply, driver, transformer, electronic transformer, switch mode, pulse width modulated, absorbed glass mat, valve regulated lead acid, and the list goes on.
Yes as electricians we have a definition for a circuit, a ring, a ring final, but Joe Public does not have a list of definitions, and even law makers don't seem to define what is a new circuit, we assume a ring final as name suggests is the final circuit so any over load device after that is not making a new circuit, so adding a fused connection unit (FCU) does not need notifying. But not seen anything to confirm that. And we don't call it a radial final so where does that leave us. Let the courts decide? well I don't want to be a test case.
So we need to define, if the thread starts with RCD, FCU, CU then OK call it a CU, but unless already defined we should say low voltage (230 vac) or fused connection unit (FCU) the one I see as a problem is RCD (recreational craft directive or residual current device) will Joe Public know what a residual current device is, or is he more likely to know it by the letters, if I talk about radio direction and ranging people are likely to not know what it is, but RADAR and it clicks. And things like PC, have so many meanings it has become silly.
But me bike, and texting grates, I know it is my bike and writing, but I try not to correct people even when it does grate.