All very true - but also usually true of 13A plugs, which are much more ubiquitous than FCUs. The best answer would probably be to sell FCUs and plugs without any fuse, since that would at least force people to consider what size fuse should be fitted. Some would, of course, moan that they had bought something which was 'incomplete' and not usable 'as bought', but I'm not sure that would alter my mind!
Very true - but even that does not prevent some 'incompetent' person subsequently coming along and changing the fuse to an inappropriate one. It's not uncommon to hear of people who have experienced blowing of a 3A fuse in an FCU saying than then then "tried a 13A one instead"!FCU's - As far as I am concerned, a FCU should only be installed by a competent person, who will understand what needs to be done, including calculation of the correct design current of the installation, selecting the correct fuse in the process.
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