FFS, FFS, FFS:
David E said:Given the length of the cable - 50m and the diameter 10mm
David E said:Given the length of the cable - 50m and the diameter 10mm
You're confusing diameter with cross-sectional area. The diameter of a made-up cable varies with the size of the cores, the number of cores, the thickness and type of insulation.David E said:I am now a bit confused could you explain the problem. On the TLC cable size calculator. The 10mm SWA is good for 48.26A can you explain the 21A to me. Sorry to appear dim!!
David E said:See what you mean. Given the length of the cable - 50m and the diameter 10mm,
David E said:the max current would be around 48A. So 50A breaker should protect the cable before it reaches the CU and also, not that I'm going to do it again, should it br dug up it will not blow the main fuse!!!!!. Am I thinking along the right lines?
ban-all-sheds said:It's very common for people to write 10mm instead of 10mm² because they can't be @rsed to copy and paste the ² into their post. ... But your cable is about ¾".
Lectrician said:What about the deg??
Lectrician said:What about the deg??
A number of years ago my house had a cable that ran from the kitchen to the shed (ten feet away) then on to the garage at the bottom of the garden. It was mostly in ordinary T&E, clipped to the garden wall (I didn't do it!) and there was a plug on a flex in the kitchen to plug it in when needed. One day I got a plug-in RCD adaptor, and plugged in the garden cable. The RCD tripped immediately! I got a meter out and set up to measure the current - there was 1.5A or thereabouts leaking somewhere... the fuse didn't blow, and an MCB wouldn't have either - only the RCD stopped what could have been a fatal accident - an amp and a half is certainly enough to kill.Agile said:Some people think that a buried SWA cable should be fed from an RCD to protect against the onset of cable failure due to water penetration.
Others think a fuse or MCB is better.
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