Cable ducting under new kitchen floor slab

[Jörn Ballentin]

I want to lay conduit under a 100mm concrete kitchen floor slab that will be poured in a couple of weeks time (to complete a ring and connect a kitchen island). This will be in preparation for my electrician to do all wiring once the builders are done.

Does anyone know if I will need to use (very expensive) PVC sheeted steel conduit in this situation (LT-PVC FLEXIBLE CONDUIT 25mm | KOPEX | Conduit) or if normal PVC conduit (KOPEX - EF150022X10 - CONDUIT, FLEXIBLE, 25MM, 10M REEL: Amazon.co.uk: Electronics) will do given the 100mm concrete on top with no real danger of anyone accidentally digging up the cable?

Also, given that it is encased in conduit and mechanically protected, will T+E cable be suitable or will I need SWA?

 

[telectrix]

how much is the kitchen costing? how much is the cost of ducting the cable properly?

 

[davesparks]

This may be a silly question but why haven't you asked the electrician who will be doing the job what he will need and when?

 

[7029 dave]

I would get the Electrician to run the conduit (in metal), would not entertain any you have suggested. As for pulling t&e through on RFC (2 cables ) tight. Conduit is designed for singles.

 

[davesparks]

Why is it even going under the slab?

 

[Octopus]

Why are you not getting the electrician in now?

 

[Leesparkykent]

You need to install a suitable cable duct that is of appropriate size for how many cables that are going to be installed in it.
you need to consider whats being installed on the kitchen island if you are having the likes of sockets, lighting, induction hob etc.

Best advice is to call your electrician to come have a look.

 

[Geordie Spark]

A nice lump of ABS 32mm waste pipe with solvent weld elbows is the way to go.

 

[ian.settle1]

Why is it even going under the slab?

Better than going on the top of the floor and being a trip hazard

 

[davesparks]

Better than going on the top of the floor and being a trip hazard

On top of the slab and under the screed would be more normal though

 

[Resu]

On top of the slab and under the screed would be more normal though

Im guessing so as not to get in the way of under floor heating pipes?

 

[123]

10M runs of Kopex under the floor, good luck to the spark pulling cables through that. Never seen Kopex used for that, by the time the builders have finished standing and trampling over it it won't be much use at all either

 

[Engineer54]

I want to lay conduit under a 100mm concrete kitchen floor slab that will be poured in a couple of weeks time (to complete a ring and connect a kitchen island). This will be in preparation for my electrician to do all wiring once the builders are done.

Does anyone know if I will need to use (very expensive) PVC sheeted steel conduit in this situation (LT-PVC FLEXIBLE CONDUIT 25mm | KOPEX | Conduit) or if normal PVC conduit (KOPEX - EF150022X10 - CONDUIT, FLEXIBLE, 25MM, 10M REEL: Amazon.co.uk: Electronics) will do given the 100mm concrete on top with no real danger of anyone accidentally digging up the cable?

Also, given that it is encased in conduit and mechanically protected, will T+E cable be suitable or will I need SWA?

Never install flexible conduit in or on the slab (prior to screed), 9 times out of 10 it will collapse under the weight of the concrete/screed mix and the builders walking over it during the pouring . As already been advised, get your electrician in NOW who will advise on the correct size and type of conduit/duct and will install said system as to not cause damage to the cables being pulled in during installation....

 

[Knobhead]

I'll put money on there being no electrician

 

[ibrahim]

the builders have finished standing and trampling over it it won't be much use at all either

 

[jeremy]

Some form of 25mm plastic Adaptaflex would be my guess. In my experience, their technical department is very helpful.

 

[SheffSimon]

Some form of 25mm plastic Adaptaflex would be my guess. In my experience, their technical department is very helpful.

Why not just use the correct cable duct?

Cable Ducting -              pipes-underground

 

[jeremy]

SheffSimon, a very good point! I thought twinwall would be very expensive, esp if he only needed a short run, but thanks to your link, I'm happy to be proved wrong!

 

[SPARTYKUS]

Why not just use the correct cable duct?

Cable Ducting - ************ pipes-underground

Great site, great prices, tar.