swa to garage.

[bigegg]

i'm planning to run a 32a supply to the garage.
taken horizontally, i have 5m of house wall + 4m of patio to cross + a 2m drop into the patio, then a 2m rise to CU in garage.
so 13m of SWA from house CU to garage CU.

6kw max power into:

https://www.tlc-direct.co.uk/Technical/Charts/VoltageDrop.html

gives me a 4mm minimum cable size.
i'm going for 10mm

I've left a 8in x 6in trench along the edge of the patio which will eventually become a concrete step/ramp onto the driveway - it will have chicken wire as reinforcing, if this makes a difference.

effectively, this means i can bury the cable 200mm in, but only 150mm down into solid concrete.
.
I'll be adding mains cable marking tape.

I'd also like to run a cat5 cable at the same time


I'm looking for options.

catenary wire over patio?
lay a scaffold pipe conduit.
just the cable? (and some 25mm pvc conduit for the ethernet)
40mm pvc pipe as conduit.
cardboard pipe as (biodegradeable) conduit, leaving a hollow through the concrete.


for these options, which will need a separate pipe for the ethernet?

I'm wanting to run the cable through any conduit before burying - its easier than trying to thread it through 2 90degree bends at floor level.

 

[julianf]

Im using soil pipe. Not massive money, and you can get all the (water tight) bends / access panels etc. off-the-shelf.

There will be a time when you want another cable, so im making that do-able with minimal fuss.

 

[bigegg]

Im using soil pipe. Not massive money, and you can get all the (water tight) bends / access panels etc. off-the-shelf.

There will be a time when you want another cable, so im making that do-able with minimal fuss.

60mm? 200mm? soil pipe?
pvc? clay? or cast iron?

 

[julianf]

https://www.toolstation.com/roofing-drainage/soil-pipes-fittings/c298

but, if you want to use clay, go for it! : )

 

[gaz1]

use 2 1/2" downpipe for ethernet use 3/4 overflow pipe you could pop the overflow pipe inside the other one

1 1/4" pipe should also fit inside the 2 1/2 pipe but id check to see if you have enough space

both can be sealed or glued

 

[Neilj]

Definitely put it underground in a pipe of some sort, I used 40mm plastic waste pipe when I did my 10mm swa years ago. If I was doing it again I would go for something a bit bigger. Also, pull a spare piece of cable in at the same time - a bit of single core will do - then you can use this to pull extra wires through at some in the future.

 

[Cuthy246]

Can I recommend that the cable is not laid directly in concrete, use conduit or put it beneath the concrete. Nightmare if you ever need to take it up otherwise.

 

[bigegg]

Definitely put it underground in a pipe of some sort, I used 40mm plastic waste pipe when I did my 10mm swa years ago. If I was doing it again I would go for something a bit bigger. Also, pull a spare piece of cable in at the same time - a bit of single core will do - then you can use this to pull extra wires through at some in the future.

i usually put two pipes in, and a loop of paracord between the two.

 

[Woody.v8]

Yes definitely use ducting, my 35mm swa went faulty and I hadn't used ducting , it was a right pain to sort as I'd layed concrete and all sorts, 2nd time round I pullepulled it through 150mm ridgiduct with a spare pull cord