Adding sockets in the garage

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Simply it leave the walls freer for putting spur shelving supports on looks neater and if generally less likely to get in the way.
Basically you have to add the volt drop for the spur. The formula is the same except that the 2 factor on the bottom disappears. Choose a value of current that corresponds to the actual load (26A for a double socket, <whatever> for a light).

You don't put two RCDs in series, it is pointless. So the existing one is fine assuming you meant to write 30mA. And assuming it gets tested.

You'll just have to juggle the figures until you are sure it's ok, if you're that close.
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i can feel bs3036 is getting a tad aggitated now. :LOL: Either extend the ring or call an electrician. ffs

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