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I suppose the difference between what I have done in commercial premises and domestic is it is under the control of an ordinary person. So it must have a consumer unit not a distribution unit for example. Not allowed repairable fuses, and so the question is if it needs protecting at less than 13A then can you really use a FCU as these have no way to stop some one fitting a 13A instead of 3A this is why we are no longer allowed rewireable fuses in a house distribution unit.
So if it needs a 3A supply then it would need to be a MCB at the consumer unit and a dedicated supply, otherwise the incorrect fuse could be fitted. Yes that is going silly but if you can't have rewireable fuses in domestic in case the wrong size is fitted, then neither can you expect the ordanary person to fit 3A not 13A.
I have seen where the pumps, valves and other control gear have exceed 3A and a 5A was fitted, however 3 and 13 amp are the two preferred sizes however this is where the fuse protects the cable, you can get 1, 2, 3, 5, 7, 10 and 13 amp and the manufacturer could stipulate any of those sizes, however getting other than 3 and 13 is not so easy, most electricians will have 3 and 13 in their tool bag but a 2A is unlikely to be carried, so if called to a system with a blown 2A or 1A fuse unless the longer or shorter fuses not used in a plug, it will likely be replaced with a 3A.
So if it needs a 3A supply then it would need to be a MCB at the consumer unit and a dedicated supply, otherwise the incorrect fuse could be fitted. Yes that is going silly but if you can't have rewireable fuses in domestic in case the wrong size is fitted, then neither can you expect the ordanary person to fit 3A not 13A.
I have seen where the pumps, valves and other control gear have exceed 3A and a 5A was fitted, however 3 and 13 amp are the two preferred sizes however this is where the fuse protects the cable, you can get 1, 2, 3, 5, 7, 10 and 13 amp and the manufacturer could stipulate any of those sizes, however getting other than 3 and 13 is not so easy, most electricians will have 3 and 13 in their tool bag but a 2A is unlikely to be carried, so if called to a system with a blown 2A or 1A fuse unless the longer or shorter fuses not used in a plug, it will likely be replaced with a 3A.