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Topic Title: Buried COPEX
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Created On: 07 March 2019 06:31 pm
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 07 March 2019 06:31 pm
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dustydazzler

Posts: 3068
Joined: 19 January 2016

Is it okay to bury copex under turf as a form of mechanical protection ?

I ask as a customer has laid a brand new lawn and run 20mm copex under neath it for a sparks (me) to pull in a cable for some lights


I would normally use swa but can't see any real problem using the copex as a duct for some 1.5mm twin and earth cable


Will of course back up with a 30ma rcd
 07 March 2019 09:55 pm
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mapj1

Posts: 12039
Joined: 22 July 2004

Copex is not going to offer much against say a garden fork, or similar tool, and unlike the SWA, the chances of hitting the earth before the live are not as nearly certain, so you could end up with a live tool the RCD becomes part of the 1st line of defence, rather than a nice to have..
I'm not sure that putting turf over the top, unless very thick, sensibly qualifies as additional mechanical protection, and I don;t think that was the exam question.
I'd consider it not very good, and not something I'd want to do, but if it was already there, but if there is no real risk of it being dug up, probably not actually a great danger.
after all cable TV cables get run like that, and they only rarely get cut.

-------------------------
regards Mike
 07 March 2019 10:01 pm
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dustydazzler

Posts: 3068
Joined: 19 January 2016

Think I will just end up ramming some 1.5mm 3c swa up the copex as I'm not sure how deep it's actually buried

The cost difference is negligible and at least i won't be called a badger
 07 March 2019 10:07 pm
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chrispearson

Posts: 1095
Joined: 15 February 2018

Originally posted by: dustydazzler

Think I will just end up ramming some 1.5mm 3c swa up the copex as I'm not sure how deep it's actually buried

The cost difference is negligible and at least i won't be called a badger


If it has been laid just under the turf, it will indeed to vulnerable to badgers.

It really does seem to be a silly place to lay a cable unless it is deep enough to avoid being spiked if the lawn is ever aerated, or to avoid damage if the lawn is ever dug up.
 07 March 2019 11:59 pm
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sparkingchip

Posts: 11682
Joined: 18 January 2003

Flexible steel conduit

SWA

Why pay over five times the materials cost to do a rubbish job?

How long will PVC twin and earth last submerged in water?
 08 March 2019 12:06 am
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sparkingchip

Posts: 11682
Joined: 18 January 2003

Wet cables.

Now admittedly SWA isn't suitable for use underwater either.
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