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I have a wall light which is connected to a 13amp domestic ring main using a 5amp fused spur. Is it possible to replace this conventional fused spur with a 5amp RCD spur for added protection should such a thing exist - I’ve only come across 13amp RCD Spurs. If not, which is preferable to protect a light fitting in this situation - a conventional 5amp cartridge type fuse or a 13amp RCD spur.

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I'd use a 13A max RCD spur fitted with a 5A fuse

What I'd do in this situation, since FCUs/"fused spurs" use BS1362 fuses based on my limited research, is take a standard 13A RCD spur and downfuse it to 5A by replacing the stock 13A BS1362 fuse with a 5A BS1362 fuse instead.

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  • How do you know all this stuff? ;) Jan 11, 2021 at 0:55
  • @Harper-ReinstateMonica -- the trick is to read manufacturer lit (datasheets, install instructions, and so on) rather closely Jan 11, 2021 at 0:56

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