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682 posts

Ultimate Geek
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Topic # 150303 17-Jul-2014 20:32
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Hi all

We are redoing our basement, removing the existing concrete (no membrane), dropping the soil level by 150mm and relaying the concrete which will hopefully net us an extra 80 square meters of useable space.

Before removing the concrete I knew our main power lines came up through a couple of (no standard) conduits, however are removing the concrete it looks like the power cables come under the foundations and into the house with no protection at all.  To make matters worse they come into the house through a pool of water.

See photos (more can be uploaded if need be)



The water comes from an old french drain which is being diverted, but still
should I be concerned?
Should I box around it before relaying the slab?
Contact the power company/council? (note alterations are being done without consent as technically no change of use)
...

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gzt

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  Reply # 1091009 17-Jul-2014 20:40
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Wiring from the road to your house is entirely your legal responsibility. If you are going to call someone you need to call an electrician.

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  Reply # 1091012 17-Jul-2014 20:41
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google for neutral screen cable.  you'll find your answer

 
 
 
 


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Ultimate Geek
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  Reply # 1091014 17-Jul-2014 20:44
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MadEngineer: google for neutral screen cable.  you'll find your answer


I did...  Does this mean I should be concerned? or shouldn't?

gzt

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  Reply # 1091016 17-Jul-2014 20:50
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Section 3.7 might indicate this is acceptable. But I'd wait for an opinion from a trusted electrician. I certainly have no clue.

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  Reply # 1091017 17-Jul-2014 20:52
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Hi, unless we missed someit in your photos, your cables are neutral screen underground rated cables, so they dont need to be in conduit, so essentially what you see is all good.

Cyril



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Ultimate Geek
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  Reply # 1091042 17-Jul-2014 21:26
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cyril7: Hi, unless we missed someit in your photos, your cables are neutral screen underground rated cables, so they dont need to be in conduit, so essentially what you see is all good.

Cyril


This is what I love about this forum, quick responses that set your mind at ease.

Digging the cables up did have me worried, esp how easy it would have been to shove my spade through the cables 

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  Reply # 1091045 17-Jul-2014 21:28
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It doesn't matter whether the cables are neutral screen or not they need to be protected to a depth of 600mm below ground level.



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  Reply # 1091050 17-Jul-2014 21:35
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larknz: It doesn't matter whether the cables are neutral screen or not they need to be protected to a depth of 600mm below ground level.
\


hmmm the conduit finishes at ground level.  Then goes under the foundations and then under a concrete driveway

I assume it has been this way since it was changed from overhead power to underground

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  Reply # 1091051 17-Jul-2014 21:40
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blackjack17: Hi all

We are redoing our basement, removing the existing concrete (no membrane), dropping the soil level by 150mm and relaying the concrete which will hopefully net us an extra 80 square meters of useable space.

Contact the power company/council? (note alterations are being done without consent as technically no change of use)
...


All of those services seem to arrive in a bundle when power and telco and water are supposed to have minimum separations. You should check that.

Is the new floor 80 sq m? I'd want the Council to confirm no consent before starting something that size. How does it avoid involving existing foundations?



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Ultimate Geek
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  Reply # 1091054 17-Jul-2014 21:49
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Bung:
blackjack17: Hi all

We are redoing our basement, removing the existing concrete (no membrane), dropping the soil level by 150mm and relaying the concrete which will hopefully net us an extra 80 square meters of useable space.

Contact the power company/council? (note alterations are being done without consent as technically no change of use)
...


All of those services seem to arrive in a bundle when power and telco and water are supposed to have minimum separations. You should check that.

Is the new floor 80 sq m? I'd want the Council to confirm no consent before starting something that size. How does it avoid involving existing foundations?


I didn't think about separations.

Changing a

 

  • damp garage, storage room, rumpus room
  • in to a dry garage, man cave, study, rumpus room.

Foundations are being improved, quite simply they were as if, not more dodging than the wiring

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  Reply # 1091139 18-Jul-2014 02:22
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Personally, I'd be more concerned about trying to keep water from penetrating through that hole under the foundation.

I have a similar issue at my house: the mains cable (two core 16 mm2 neutral screened) and the phone cable both emerge from under the foundation (neither in conduits). I've had a devil of a job trying to keep water out. In the end, I went to a lot of trouble and installed a sump and drainage system and sump pump to remove the water.

Those types of mains cable have a very thick outer PVC sheath. They're designed to be installed underground with or without a conduit.




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