Consumer unit tails

[TheHUNTED]

Hi all,

I've just completed a board change at a flat, and currently filling out the cert. The tails from the meter cupboard are a 16mm live cable with several strands for the neutral and earth.

Just wondering what I put in the cert box for supply conductor size.

Cheers

 

[Blue Duck]

16mm? 

 

[Andy™]

erm... you could always put 16mm?

 

[Blue Duck]

I win! :slap

 

[TheHUNTED]

I was just checking. Thanks

 

[Andy™]

took my longer to type my reply

 

[Blue Duck]

About 45 seconds by the looks of it....

 

[binky]

what do you mean by several strands for nuetral and earth?

 

[Tony S]

Split concentric by the sounds of it.

 

[Andy™]

thinking the same thing myself

 

[Blue Duck]

Like this?

Still 16mm

 

[binky]

what do you reckon the earth size is?

 

[Andy™]

same as the live & neutral

 

[binky]

haven't used split-con for quite a few years, couldn't remember if earth is same size.

 

[Tony S]

For 16mm² both the earth and neutral are 16mm². 4 strands for earth, 7 for neutral.

The earth is reduced for 25mm² and 35mm²

 

[apprentice87]

And split con is not allowed..... So, i would not be turning the power back on and notifying the DNO, as it was obviously stolen from them, and they will want to be turning the power off.

john...

 

[Blue Duck]

If you are a BNO and the cable is run in earthed steel trunking it might be okay? 

 

[Tony S]

And split con is not allowed..... So, i would not be turning the power back on and notifying the DNO, as it was obviously stolen from them, and they will want to be turning the power off.

john...

????

You can get concentric and split concentric from any supplier. The only one that shouldn’t be used is the plain concentric due to it being a PEN conductor.

Split concentric should be regarded as the same as T+E when it comes to RCD protection for cables in walls.

 

[Rob.]

Agree with Tony here, nothing wrong with using split con. It's more expensive than T+E so I don't know why you would as it doesn't offer any particular advantage installation wise. 

There's nothing wrong with using it though. 

 

[Tony S]

From what I remember of it, the outer serving is as tough as old boots.