Laying cable in screed floor

[Ken]

I'm having an extension built (single story bedroom at side) The builders have finished the base concrete and will soon lay 2" plastic insulation and 4" screed on top. A 'knowledgeable friend' has just pointed out that now would be a good time to lay an armoured cable from my mains supply to the garage - under the insulation and/or screed and out through the front garden as deep as I can get it.

Is this a good idea / legal ?

If so, does it need any protection as well as the armouring under the screed? How would I fix it to the floor?

TIA Ken

[tony sayer]

In article , Ken writes

If you can why not install a cable duct so that other services can be added in as and when required?...

[The Natural Philosopher]

Yes, and IIRC yes.

Mmm. Not sure, but I would hazard a guess that no, it needs no protection, but I would personally slip some of that foam insulation over it to avoid stress on it.

In practice, you can nail straps to the concrete I would say.

Under the ground, you are supposed to go down a foot or three. I used a mini digger for a similar escapade once.

Makes it a lot easier. Get it well below digging depth anyway, and lay a ribbon of that 'caution/hazard' tape over it. Best to lay it in a shingle bed too, but not mandatory. See regs.

[Ian Stirling]

Yes. Me, I'd go for 3" pipe laid under the lawn, with wide swept bends. In case you want later to run heating/water/sewerage/... out to the garage in the future.