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UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
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Multiple long cables in parallel.
I have 3 2.5mm^2 T+E cables going to the garage, in a duct.
They are about 30m long. Assuming 16 ohms per Km, that's .55 ohms. Or around 40A, on voltage drop alone, so that's not a concern. Why 2.5mm^2? I had planned to put in one 2.5mm^2, but I realised as I was about to drag it through the conduit, that I had all this spare cable... The duct is buried in the ground, and is 36mm in diameter. The easy approach is to put a 40A fuse at the close end, and parallel all the wires. Of course, this isn't very safe, as there are unfortunately joins in the cable. My current plan is to common all the L/N/E, put a 13A fuse on each live, and at the garage end, have a RCD CU, with a seperate earth spike. Anything obvious that I've missed? |
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