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danny199

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Hi, just wanted to know the depth to dig the trench for an armoured cable to an outside shed. I've read that the reg are a bit opaque but considering the mrs found the existing cable about one inch down (a standard orange cable, looks like its off a flymo cable - it is live as the shed lights and sockets work) I want to make sure the new one is at a safe depth. I was planning to dig down 450mm, then lay 150mm of sand on top, and ice it off with some of that warning tape. Then when I get the electrician in to do other bits we are planning, he can connect up and do the dangerous stuff.
 
The regulations (BS7671) state that it must be dug at a sufficient depth. The IET electricians guide to the building regs suggests at least 500mm which is what I have always adhered to. I would have that sand as perhaps 75mm either side of the cable so that it's sitting in a bed of sand, rather than all on top although it doesn't really matter.
 
I know what would happen to the spade if I gave it to my Mrs! :eek:




Obviously I would have a perfect trench!!
Yeah 450 to 500 deep with something soft to prevent sharp stones damaging the sheath then I usually backfill 150ish then tape so there is a bit of a safety gap before you hit the cable. Then fill it up!
 
Excuse the quality of the pic , but this may guide you to a correct method of installation compared to the previous one.Trench Depth - Clarification 2019-09-01 13.46.54 - EletriciansForums.net
 
Thanks for that @Spoon, I need a new phone to be honest , the lens has suffered with lime dust ect. No flash either. :)

I cheat. I have the regs scanned to PDF. Makes it really easy to search.
 

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