Advice on running Ethernet cable outdoors

Don't use that cable that was advertised there. It's copper clad aluminium so not real Cat 6. You'll only get 100 Mb on longer runs.

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Ouch, how did I miss that? Well spotted.

He used the 50mm red conduit that comes in sections. There are twists and turns all over it and no way we'd ever run another cable in it. To get it done we had to pull the cables through section and joint at a time.

If you can do a continuous run with the conduit you linked to a 50m run is a breeze. Check youtube for ways of pulling cables. I've sucked, blown, used water pressure and cabling rods to get cable through. In most cases best to pull a string or rope through first and use it to pull both cables at the same time. Also worth using twice the length of string that you need so you can leave it in the pipe just in case.

You might be able to use fibre ducting, it's about 20mm OD, smooth bore and semi rigid which makes it easier to pull/blow cable though.

I did the under driveway ducting recently. I used this

I had to drive a fair distance to get it but the alternative was red ESB ducting and IMO that should be reserved for mains power.

It is completely rigid but can probably be bent with a heat gun, and they also sell bent sections.

The intention is to then run 20mm fibre conduit through that for a continuous run from the road to my neighbours house (my driveway goes over his land and he's waiting on a fibre install).

The local electrical wholesaler also had black bendy conduit that was maybe 30mm and looked tough enough, but I wasn't confident it would have enough clearance for the 20mm conduit to go inside.

None at all I can live with any colour underground. I've run a lot of single cables in half inch water pipe it works. What would be wrong would be to run mains cable in plastic waterpipe, drain pipe or anything that didn't give a warning of mains voltage cable.

I find hydradare water pipe makes great ducting. Smooth bore with no joints and lots of diameters available.

I mis-spelt it. It is hydrodare pipe. Go to your local plumbing shop and have a look at the different diameters. 25mm should easily be big enough. You may get away with 3/4 inch. Getting a string through to pull it might be a challenge. Maybe vacuum some wool and use it to pull the string.

Why not pay the bit extra for 4 times the internal cross section and get the 50mm ESB pipe? If you are laying that without anything other than natural bends then you should manage a 50 meter pull OK.

That water pipe looks perfect.

Bring the ESB conduit to the surface then use a grommet in the end of the pipe to reduce the diameter down to one that is easy for the wall. Not an easy thing to find but they do exist www.amazon.co.uk/sourcing-map-Grommet-Conical-Protect/dp/B09BR5HBXH/ but any end cap can be drilled out to take a smaller diameter pipe then siliconed in place. These might fit https://www.screwfix.ie/p/floplast-solvent-weld-access-plug-white-50mm/72586

If you are laying that 50mm pipe "naturally" (ie in one piece not forcing any bends) and leave a string in it for pulling then you have as good chance as any. The angle you have to pull from at the ends also makes a difference so try to allow for that, what I mean is don't spoil your chances by having a right angle 300mm down just below that window sweep the pipe up from lower down up to the surface or near to it.

btw those end caps have a screw, forget that just screw that cap on and use the body as a push fit over the end of the ESB pipe. I've done that but without having one in my hand here can't guarantee that. I'm fairly sure there are other kitchen drain pipe fittings that can be used on the ends.

What I would do is run the 50mm pipe into a gully made up of blocks cemented in place then insure when you slab over it you have one slab that you can lift that acts as an access cover. From inside that gully you can neck down to whatever size suits to go up the wall and have access later by lifting a single slab. You can point up the slab as hopefully you'll never need to lift it but if you do you know its an easier job than lifting more than one slab then digging the ground up and you'll have good access to the end of the pipe for pulling another cable.

Bah. I see now that a granite step is going here. Would definitely ruin the look.

You were worried about water getting in hence my grommet suggestion. You might as well seal the ends of the pipe so find something that fits. I just suggested a couple of things that came to mind you don't need ether. If you run the 50mm pipe into a some form of access chamber under a slab then you can just fill the end with silicon/mastic of some kind. Even if you never intend to lift the slab again you can run the 50mm pipe into a plastic box and a smaller diameter pipe out up the wall.

Anyway knew I'd seen something online in the past that might help. Some good info here https://www.eir.ie/opencms/export/sites/default/.content/pdf/NewDucting.pdf page 7 has a diagram which looks good to me. Note they suggest a minimum of 25mm INTERNAL diameter for a single cable.

Edit> RE: the access chamber. Once you have gone the main distance your access chamber doesn't have to be just below the wall if there is a better location up to about 4 meters away then the pipe size can change at that point.

It should be ok, but check it has a low friction inner surface before purchase. That stuff should also be in stock in your local plumbers' supply shop.