Adam2 Posted January 7, 2021 Share Posted January 7, 2021 My current setup is a couple of small cabinets at the site perimeter, one with meter + small CU and other essential bits and the other with sockets. I may leave these in place long term so am planning to run a conduit for the house supply from here to the plant room - about 15m away. It can get buried quite easily and I wondered though if I should already place the cable in the conduit as it may be hard pulling it through even with a pre-installed line at a later date. For now the cable wouldn't be connected. If it makes sense to pre-install the cable - what spec cable should I go and get? Any particular conduit needed? Thanks Link to comment Share on other sites More sharing options...
ProDave Posted January 7, 2021 Share Posted January 7, 2021 16mm steel wire armoured will be okay at 15 metres as long as it is fed by an 80A switched fuse, otherwise 25mm steel wire armoured. Can be buried direct no need for duct but if you want a duct ant BLACK duct >50mm diameter will do. Link to comment Share on other sites More sharing options...
andy Posted January 7, 2021 Share Posted January 7, 2021 Black twinwall duct as big as you can, pull a nylon draw rope through and then when you want to pull the real armoured cable through use a cable sock - best thing I ever discovered, I pulled a bloody awful 5 core SWA pulled through without too much sweat. Link to comment Share on other sites More sharing options...
Adam2 Posted January 7, 2021 Author Share Posted January 7, 2021 OL thanks Any advantage in 25 over 16 as doesn't seem much price difference? Or will it just be more hassle being harder to handle? Link to comment Share on other sites More sharing options...
PeterW Posted January 7, 2021 Share Posted January 7, 2021 25mm won’t bend as well so make sure you have big radius bends in the duct. I’d run 25mm just for peace of mind. Link to comment Share on other sites More sharing options...
TonyT Posted January 8, 2021 Share Posted January 8, 2021 always go with the bigger cable, you never know what you will have to supply in 5 years time, so a sensible upgrade from 16mm to 25mm makes sense to me. EV Charging/ Heat Pump etc We always use flexible 100mm ducting for cables, makes it easy to complete ground works and install electrics later, and no one ever complains about not being able to get cables through it Link to comment Share on other sites More sharing options...
Adam2 Posted January 8, 2021 Author Share Posted January 8, 2021 OK cheers - will get that on order ? 1 small item off the list... Link to comment Share on other sites More sharing options...
Russdl Posted January 8, 2021 Share Posted January 8, 2021 On 07/01/2021 at 17:32, Adam2 said: I wondered though if I should already place the cable in the conduit as it may be hard pulling it through even with a pre-installed line at a later date. I think that is an excellent idea. Why didn’t you think about it a couple of years ago so I could have plagiarised it!! (More to the point, why couldn’t I have thought about that myself!) 1 Link to comment Share on other sites More sharing options...
Temp Posted January 8, 2021 Share Posted January 8, 2021 (edited) Yes, you can also put the cable in the duct while its lying on the ground nice and straight. Just make sure you have enough out each end. In my area duct comes with a thin string in it. Use it to pull a proper 8-10mm thick draw rope. Edited January 8, 2021 by Temp 1 Link to comment Share on other sites More sharing options...
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