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DIY Forum >> Electrical Questions >> laying utilities to a garden outbuilding https://www.askthetrades.co.uk/cgi-bin/yabb/YaBB.pl?num=1090417686 Message started by Mr_Ed on Jul 21st, 2004, 2:48pm |
Title: laying utilities to a garden outbuilding Post by Mr_Ed on Jul 21st, 2004, 2:48pm I' building an office / workshop at the bottom of the garden. I need to lay electric, water and phone supplies about 20 metres. I'm happy enough to use armoured electric cable in an 18 inch deep trench, but for belt and braces was planning to feed it through a plastic conduit. My question is this. can i feed to phone cable through the same conduit or will there be interference? if so how far apart do the cables need to be? ??? |
Title: Re: laying utilities to a garden outbuilding Post by HandyMac on Jul 21st, 2004, 3:11pm I believe the requirement is 50mm (2in). You must not run telephone/data cables in the same conduit as mains. This isn't so much a transmission issue, but one of safety. Andrew |
Title: Re: laying utilities to a garden outbuilding Post by Lectrician on Jul 21st, 2004, 5:11pm Dont use conduit. Use proper electrical DUCTING, continuoes legth on a roll is best, no joints to snag on. |
Title: Re: laying utilities to a garden outbuilding Post by plugwash on Jul 21st, 2004, 6:05pm you can run them as close as you like if they are in seperate ducting so one duct for mains one for phone and one for water water needs to be deeper too iirc |
Title: Re: laying utilities to a garden outbuilding Post by rabbit_rabbit on Jul 21st, 2004, 7:28pm Interesting Plug - I thought that the Water Regs (for MDPE) was same as IEE for cables - 750 mm. RR |
Title: Re: laying utilities to a garden outbuilding Post by L.Spark on Jul 21st, 2004, 7:48pm was gonna say 18" is not deep enough for cables, however im not gonna tell some one to dig it more than 18" deep unless they ask, im not doing the digging!! 750mm sounds more like it or 650mm min |
Title: Re: laying utilities to a garden outbuilding Post by supersparky on Jul 21st, 2004, 7:59pm there is no minimum for cables people- its interpritation unless he is having a seperate new metered supply to his shed.....would have thaught it was a submain from house... ss |
Title: Re: laying utilities to a garden outbuilding Post by L.Spark on Jul 21st, 2004, 8:17pm we were taught minimum depth for SWA cables was to be 650mm, from top of cable too |
Title: Re: laying utilities to a garden outbuilding Post by Lectrician on Jul 21st, 2004, 8:46pm to be buried at a depth that will prevent unintentional damage (or some wording such like) :-) |
Title: Re: laying utilities to a garden outbuilding Post by rabbit_rabbit on Jul 21st, 2004, 8:56pm Sure there is SS. I wont do a CPW BUT 16th Regs its 750 mm. Having said that, and my Bible is in the van not here, if I recall its 750 mm beneath area that can be cultivated. I hope so coz the last one I did was bury SWA in a driveway and it was an AWFUL job digging rocks and boulders, even used my DW and chisel! I gave up in the end and its all of 10" down. RR |
Title: Re: laying utilities to a garden outbuilding Post by supersparky on Jul 21st, 2004, 9:02pm no, i thaught the minimum was removed, infat im 99.9% sure that it has been. lectrician is about right with the wording, its upto you to decide ss |
Title: Re: laying utilities to a garden outbuilding Post by L.Spark on Jul 21st, 2004, 9:12pm well thats crazy, people wont bother burrying it sufficently deep, and say its "to be buried at a depth that will prevent unintentional damage" how can u define that, only have to look at a good size spade! ::) |
Title: Re: laying utilities to a garden outbuilding Post by supersparky on Jul 21st, 2004, 9:48pm not if your any good LS not gunna stick a cable at 2inch under a flowerbed are ya!!! only place ive seen cables at 750mm was when the rec dug up the street by a sub near where i used to live, and that was 11kv swa ss |
Title: Re: laying utilities to a garden outbuilding Post by L.Spark on Jul 21st, 2004, 11:11pm wrote on Jul 21st, 2004, 9:48pm:
no, id dig up lawn instead, or just do the easy approach and clip direct with cleats ::) |
Title: Re: laying utilities to a garden outbuilding Post by ChubbyPhaseWire on Jul 21st, 2004, 11:24pm Cables to be installed in ducts or pipes in the ground are not required by BS 7671 to have armouring and/or a metal sheath, if the duct or pipe is sufficiently strong to resist likely mechanical damage. In case of doubt, a cable fulfilling the requirements of Regulation 522-06-03 should be provided. Protective conductors which are buried directly in the ground must comply with the requirements of Regulation 542-03-01. All buried cables must be marked by cable covers or a suitable marker tape, and buried conduits or ducts must also be suitably identified. A warning tape above the duct or conduit run would be suitable. Cables, conduits and ducts must be buried deep enough to avoid being damaged by any disturbance of the ground reasonably likely to occur. This could include gardening/horticultural works, excavating for any local buried service pipes etc. Generally, it is better to locate cables etc. clear of such possible works. A depth of burial of less than 500 mm is usually inadvisable as shallow laid cables may be inadvertently damaged by general gardening etc. Cables that cannot be buried at a reasonable depth should be specifically protected, e.g. by ducts encased in concrete, or installed along an alternative route. Before any excavation is undertaken for cable or other works HSE guidance booklet HSG47 "Avoiding danger from underground services" should be studied, as it provides valuable advice on safety aspects. It is important to be able to identify exactly where hidden services are located and accurate records, including drawings, should be made before trenches are backfilled. Cable routes should be located on drawings by dimensions from some fixed object that is not expected to change for a considerable time, (e.g. a building). Road and pathway features may be relatively easily changed. Scale drawings are of little value unless very detailed. Concrete route markers may be installed at changes of direction of cable routes and at regular intervals along routes. ;) PS Where is the fcuking kek to the front door wabbit |
Title: Re: laying utilities to a garden outbuilding Post by L.Spark on Jul 21st, 2004, 11:43pm there we go then, LoL!!! :D |
Title: Re: laying utilities to a garden outbuilding Post by Mr_Ed on Jul 22nd, 2004, 3:06pm Cheers peeps, I guess if I collate all the advice and use the most stringent - I'll come to no harm. so it looks like a trench three feet deep - three feet wide with 2inch thick concrete pipes spacea at least 12 inches apart with an itty bitty caple (or pipe) in each. I think I'll move the workshop a little nearere the house :-/ |
Title: Re: laying utilities to a garden outbuilding Post by scotspark on Jul 22nd, 2004, 10:57pm thot it was 18" or 450mm as that was a spade and a half deep and make sure youcover with warning tape and lay on a bed of sand then backfill wi sand depends where you are running the cables I suppose but don't see there being much of a hazard to cables at 450mm deep in your average back garden |
Title: Re: laying utilities to a garden outbuilding Post by L.Spark on Jul 22nd, 2004, 11:55pm regs has softned up now on the depth it seems, just have to ensure no spades are likely to penertrate it, and since it is just a back garden, not likely to be any excevation, as long as you keep time team out!, no ones searching for roman remains in my back garden! ::) |
Title: Re: laying utilities to a garden outbuilding Post by plugwash on Jul 23rd, 2004, 12:21am generally time team geophys before they start digging so i expect they would find your cable before they start doing any digging |
Title: Re: laying utilities to a garden outbuilding Post by L.Spark on Jul 23rd, 2004, 12:25am We're all safe after all! ;D |
Title: Re: laying utilities to a garden outbuilding Post by supersparky on Jul 23rd, 2004, 12:27am for gods sake it was a simple question. all he/she needed was a simple answer, not a debate on regs. ss |
Title: Re: laying utilities to a garden outbuilding Post by L.Spark on Jul 23rd, 2004, 12:48am lol, he didnt ask for depth anyway was asking re segregation, but depth didnt seem enough, arh well ::) |
Title: Re: laying utilities to a garden outbuilding Post by scared_of_diy on Aug 2nd, 2004, 10:26am Although related this response is on a different tack. I believe if you plumb water into a seperate building then it becomes subject to planning permission from the council and the dreaded council tax. Electrical is fine no planning permission is required. This may vary from Council to council. I know this because I went through a similar excercise and gave up after trying to fight the council! |
Title: Re: laying utilities to a garden outbuilding Post by L.Spark on Aug 2nd, 2004, 10:00pm that might be handy to know, thx :P |
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