Cable in concrete trench corroded

[brianmoooore]

Are there any cracks in the concrete? A much more likely scenario than corrosion, is for the cables to have been sheared as a result of concrete movement.

Never come across a cable damaged like this, as I've never dealt with one buried directly in concrete, but I have seen it with pipes.
One particular job, I was called there to sort a non heating immersion heater, so I expected to find a dud immersion 'stat or burnt wire to it. Turned out to be a sheared hot water pipe in the kitchen floor, under the DPM, which was dumping water into the ground faster than it could be heated.

 

[mainline]

Had to deal with central heating copper pipes buried in concrete with an oak block wooden floor on top lasted around 8 years before the centre of the floor lifted about 4 inches, ended up being an insurance job costing £1000s in the end

 

[maccaandy]

Thank you for the replies. I'll try and make sure the people doing the work don't disturb the cable so can see what has actually happened to it.

 

[mainline]

You could quote section 522

 

[maccaandy]

That's very handy ineed. Just found a little guide about it online. There absolutely hasn't been this consideration done when installing the wires. https://dms.niceic.com/0000003685.pdf

 

[brianmoooore]

I have seen a lot of cables in wooden trunking buried. Not a good idea buried.
In concrete.

Wooden trunking above DPM should be fine. Used to be a common installation method for copper pipes in floors - two lengths of 2X1 batten laid on edge, with a 10mm plywood cover on top, then screed laid flush with the top of the plywood.

 

[cliffed]

Hopefully there’s a duct somewhere in the ground if you can find it….you could dig around the cabling & see if you find the duct & look at the cabling to see if they are damaged

 

[OnlQQker]

Mixture of new and old cable by the looks of it, and is that a 28/22mm copper pipe dropping into the floor?

If so is it gas?

 

[Midwest]

PVC cables buried in concrete. Doesn't seem like a good design. Last time I did some concreting, I ended up with very chapped hands.

 

[7029 dave]

I have provided 2 new circuits chased in floor when my mates parents had their kitchen revamped.
His dad was an architect and instructed me to do it, that your route. lol Was not keen but hey he was the boss never had any comebacks done that job mid to late 80's. Plastic conduit used.
His parents are long gone RIP and he now lives in the USA