TANK Posted April 22, 2023 Share Posted April 22, 2023 Hey guys hope it's all good posting this one here... I'm intending to feed in electrics to the outbuilding from the house - the distance between (the corner of) house and said outbuilding is roughly 2.5m. it will come down the wall, then through the 2.5m trench under a new patio I'm putting in, to the OB. The question I have is, will the patio serve as part of the 450mm minimum depth requirement? The trench at present is about 250mm, so with the patio on top or should kep more or less get there. Is this acceptable or a 'cheat'? cheers in advance.. Link to comment Share on other sites More sharing options...
MikeSharp01 Posted April 22, 2023 Share Posted April 22, 2023 As I understand it it is from the finished surface so you should be OK. Make sure you put the warning tape at the correct level above the cable, at higher levels as well, so directly beneath the slab if like and put it in ducting if you have some. If you are in Kent I can let you have a length as I have a bit left over. 1 Link to comment Share on other sites More sharing options...
TANK Posted April 22, 2023 Author Share Posted April 22, 2023 Thanks for that Mike. No I'm miles away in Herefordshire and already have some ducting but thanks anyway. I prob should have mentioned that I can't fit the trench deeper due to drains further down... Link to comment Share on other sites More sharing options...
Temp Posted April 22, 2023 Share Posted April 22, 2023 I did ours back in 2007 and found this guide useful.. https://electrical.theiet.org/media/1695/electrical-installations-outdoors-a-supply-to-a-detached-outbuilding.pdf Hopefully not out of date. 1 Link to comment Share on other sites More sharing options...
Big Jimbo Posted April 22, 2023 Share Posted April 22, 2023 Had my daughters garage signed off by a fully qualified electrician about 2 years ago. He said that the regs no longer require the armoured cable to be burried. Said it can be surface mounted. I dont know how correct this is ? 1 Link to comment Share on other sites More sharing options...
Dreadnaught Posted April 23, 2023 Share Posted April 23, 2023 21 hours ago, Big Jimbo said: Said it can be surface mounted. Yes, had my electrician on site a few days ago on this precise issue. He said the same. Either 450mm down or surface mounted (even just above the soil level) but not in between. 2 Link to comment Share on other sites More sharing options...
TANK Posted June 19, 2023 Author Share Posted June 19, 2023 Thanks for all the replies guys. Thanks to all this lovely weather I've managed to put in my concrete flooring in the OB and have further excavated the trench to increase the depth and width and better facilitate the plumbing and cabling. Annoyingly the drain sits in an awkward position, right on the corner of the house at odds to the angle of my patio, and also slightly obstructing this trench. I'm not sure I can get a sparky in for a few weeks, but don't really want to leave the trench open like this for too long as I'm thinking it leaves the house foundation partially exposed and the trench walls will dry out and start crumbling... so I'm wondering - Am i ok in being proactive by running in a length of armoured cable (I'm assuming 2.5mm will suffice?), concreting over the top of it, then safety tape, and completing the trench work (I still need to find a solution to tie in the drainage) before the sparky attends? Or would they want to see in the cable themselves? I'd like to attach photos to illustrate what is what but can't. When I click 'add files' nothing happens. any ideas? Link to comment Share on other sites More sharing options...
TonyT Posted June 19, 2023 Share Posted June 19, 2023 Put a 50mm duct in, let’s you backfill and electrician can pull duct through later? some electricians may not sign off work that they can’t see so may not be keen on you running cables What electrical equipment will you be using in the outbuilding? 1 Link to comment Share on other sites More sharing options...
TANK Posted June 19, 2023 Author Share Posted June 19, 2023 (edited) Thanks Tony. That's a good idea. It will be basic power tools, a smallish chest freezer, maybe a fan for occasional use (for gym work). Possibly a tv at some point.. Edited June 19, 2023 by TANK Managed to upload a photo Link to comment Share on other sites More sharing options...
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