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Landymatt

Member Since: 31 Dec 2018
Location: York
Posts: 191

What conduit / pipe for putting in trench for future needs

Learned ones,

We've dug a 70m straight trench across the garden for putting armoured electrical cable in.

In the future we may want water, other cables for e.g. the internet, cameras etc. at the same place and want to avoid digging again.

Does anyone have experience of pulling additional pipes or cables through the corrugated conduit I see advertised for this purpose? I'm also considering using 110mm soil pipe, as that 'feels' like it'd be smoother / easier to pull stuff through.

Cheers,
Matt

11th Aug 2021 8:45am

#1784

Member Since: 11 Nov 2020
Location: Almunge
Posts: 45

My recommendation is to put in a MDPE waterpipe and a Cat6 cable approved for outside already now, the price for those is small in comparison.
Pulling these through a bigger pipe later is possible in theory, but my experience is that it's not so easy in practice.
With electricity, water and ethernet you should be covered for most needs? 110 SE D200 MY21 Tasman blue
Discovery 3 V8 HSE MY06
Discovery 1 V8 ES MY97
RRC 2-door V8 MY83

11th Aug 2021 9:05am

Rashers

Member Since: 21 Jun 2015
Location: Norfolk
Posts: 3495

2014 Defender 110 Puma 2.2 USW Corris Grey

Hi Matt,

You shouldn't really use soil pipe for any cabling, but I have and it works really well as you say it is smooth bore and easy to drag things through

A cheaper option is smooth bore cable ducting. It will be considerably cheaper than 110mm soil and is made for the job.

One word of caution, don't underestimate the drag on even a small cable over 70mm. Leave a good draw rope in the pipe / duct and without wishing to sound like the police, you shouldn't be running mains cable and ethernet / CCTV cables (which are not rated for mains use) in the same duct. Over 70m you may also find that if you do run them together, you could get interference on the ethernet / CCTV output.

As #1784 says, for how much it costs, sling an MDPE pipe in the trench now. It doesn't need to be in a duct.

11th Aug 2021 9:17am

Balvaig

Member Since: 19 Feb 2016
Location: Fife
Posts: 730

2016 Defender 90 Puma 2.2 Landmark LE Corris Grey

Corrugated pipe will be a nightmare over 70 m. Soil pipe is smooth inside and would work for additional electrical cables. Not certain about water pipe as it is more rigid and tends to bend as it comes off the coil..
Would agree that installing the services now is your safest bet.

11th Aug 2021 9:24am

BuckBlu110

Member Since: 19 Apr 2014
Location: in the pub
Posts: 712

1994 Defender 110 BMW M57 3.0 Diesel CSW Buckingham Blue

I would advise proper electrical ducting, it’s smooth on the inside and has an pull cable built in. I bought a 50m roll a couple months back and it was around £50.

11th Aug 2021 10:08am

What puddle?

Member Since: 25 Oct 2013
Location: Reading
Posts: 952

As a plumber, I would go with 110mm soil pipe, though make sure you go male to female the way you want to future-thread whatever you put through there (so there's no resistance). As Rashers says, leave a good strong rope in there so that you can pull through future stuff...and tie a new rope to whatever you put through in future to leave a new rope in there. Now left.

11th Aug 2021 12:39pm

v8bob

Member Since: 14 Mar 2018
Location: Midlands
Posts: 316

Whatever you use, feed a piece (or three) of rope through the pipe when you lay it.
Then feed through a plug in the end and tie a knot.
Use the rope to pull through when you’re ready

11th Aug 2021 5:10pm

diesel_jim

Member Since: 13 Oct 2008
Location: hiding
Posts: 6092

Using cat6STP (shielded) will help considerably when running near mains cables.

12th Aug 2021 9:44am

jeffersj

Member Since: 23 Jan 2015
Location: Near Preston
Posts: 431

1996 Defender 90 300 Tdi HT Bronze Green

May be wrong but Mains cable and water pipes shpuld not be in the same duct? Jeff
Ex 1968 Series 2A
Ex 90 TD5
Ex D3
Ex D4

12th Aug 2021 3:17pm

Rashers

Member Since: 21 Jun 2015
Location: Norfolk
Posts: 3495

I don’t think you will find any regulations that say they can’t be in the same duct. Gas pipes have to be segregated for obvious reasons.

Cables are water proof and often installed under water or are installed in ducts which are full of water. There is talk of running Cables through water pipes to get fast broadband to outlying areas (albeit that’s not mains electricity!)

Cables don’t actually need to be in ducts. As long as they are armoured, laid in a bed of sand and identified above (usually by tiles or tape) the duct isn’t needed.

12th Aug 2021 3:35pm

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