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Discuss How do we solve the long meter tail problem? in the Electrical Forum area at ElectriciansForums.net

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Snailspark

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Just seen a you tube video by Artisan, he mentions there is a 15 meter run that goes in the fabric of the building from the meter/100amp cut out to the consumer unit.
it started a debate as to whether to code it a c2 or c3. The question that I have is how would you fix/solve the problem?
the house was a relatively new build as well so how did it pass initial verification?
Discuss.....
 
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Andy78

Andy78

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What exactly was the problem ? Was it not protected apart from DNO fuse ?
 
S

Snailspark

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  • #3
What exactly was the problem ? Was it not protected apart from DNO fuse ?
That’s correct - the tails were unprotected - just run directly from the dno fuse to meter then long run into fuseboard
 
Andy78

Andy78

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Solve that issue by fusing the tails correctly 👍
I've seen it a lot on new builds. Most don't have a clue what they're doing, just copy other examples of quick and shoddy work.
 
Ian1981

Ian1981

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That’s correct - the tails were unprotected - just run directly from the dno fuse to meter then long run into fuseboard
No there was a switch fuse in a separate cabinet, the issue was that the tails are potentially unprotected in the wall but for all he knows they could be mechanically protected, a limitation in my opinion, you can’t possibly know how they are installed
 
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Snailspark

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No there was a switch fuse in a separate cabinet, the issue was that the tails are potentially unprotected in the wall but for all he knows they could be mechanically protected, a limitation in my opinion, you can’t possibly know how they are installed
Let’s just assume they are unprotected in the wall for the sake of argument. The question I have is how would you correct the problem?
 
davesparks

davesparks

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Let’s just assume they are unprotected in the wall for the sake of argument. The question I have is how would you correct the problem?
If the problem is that they are unprotected then the solution must logically be to protect them.

Dig them out and install a heavy gauge metal plate over them would be one soloution, and possibly ideal from an electrical point of view, but not so ideal from the customer point of view.
 
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Dustydazzler

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If the tails are in the cavity without being in earthed metal containment , then they would require rcd prot3ction
 
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Snailspark

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If the tails are in the cavity without being in earthed metal containment , then they would require rcd prot3ction
That’s what I thought too but how / where would this be installed. I’ve never had this problem yet Myself but wondered how I would resolve it in the most efficient way.
 
Andy78

Andy78

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That’s what I thought too but how / where would this be installed. I’ve never had this problem yet Myself but wondered how I would resolve it in the most efficient way.
You can't really as then you'd be putting the whole installation under a single RCD, which is not compliant with section 314.
Another method from 522.6.204 would have to be considered if the cables were less than 50mm deep.
 
Lister1987

Lister1987

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Put in the smallest fuse board (4 way?) and take it from/to the db.

If it's feeding the install then have the new enclosure with RCBO (or RCD & MCB) at the servicehead other have it off the main board by a suitable sized RCBO.

I'm probably wrong in my ideas but I'm happy to be properly guided.
 
C

cliffed

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Unprotected the tails can be Swa,without Rcd protection,otherwise a time delay Rcd @ front.
Then I would supply rcbo’s for outgoing circuits.
 
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