Split Concentric Termination

[catdog]

I'm no expert on split concentric (assuming that's what this is)......But an earth clamp doesn't seem the best solution to this (also as the earth cores appear to be insulated!

This is for an eicr on a sub main but I'll have to do the remedial work at some stage.

Any advice on how to terminate this correctly?

Thanks!

 

[Richard Burns]

Not aware of any requirement in BS7671 to provide mechanical protection to cables buried in the ground?

NBP is presumably referring to 522.8.10 where cables without an incorporated, cpc suitable, earthed covering should be protected against mechanical damage by a conduit or duct.
Even though the regulation is worded with reverse emphasis.

 

[Deleted member 26818]

Concentric and split concentric cables have an earthed armour or metal sheath suitable for use as a protective conductor.

 

[Ian1981]

Concentric and split concentric cables have an earthed armour or metal sheath suitable for use as a protective conductor.

The earthed cores to split concentric Doesn’t fully encase and cover the whole cable tho

 

[SparkySy]

I agree, concentric is live centre conductor and pen outside conductor. Split concentric is live centre and split outer earth and neutral separate, not seen it with swa but that's not to say it doesn't exist!

 

[westward10]

Originally concentric cables were deemed okay in walls without additional rcd protection but this was later removed.

 

[SparkySy]

I remember that as we were doing a big barn conversion and used split concentric for the sub mains. There was an argument at the time over weather it needed rcd protecting!

 

[Deleted member 26818]

The earthed cores to split concentric Doesn’t fully encase and cover the whole cable tho

The Neutral is connected to earth.

 

[freddo]

Originally concentric cables were deemed okay in walls without additional rcd protection but this was later removed.

It's a shame really as split con is far easier to install through a building than the equivalent size armoured cable.

 

[freddo]

The Neutral is connected to earth.

Neutral is classed as a live conductor.

 

[Ian1981]

The Neutral is connected to earth.

The neutral is sleeved/insulated
If it wasn’t then it is effectively a PEN conductor which split concentric is not and therefore can’t be used in the consumers installation.
It’s split concentric cable being discussed here the neutral and earth are separated hence the name split

 

[stevels4]

Split concentric termination is normally done with a 3 finger break out boot and heat shrink on all conductors.

 

[Graham DJ]

Looks like PME if it feeds a Midland Style Metal Cut Out - the ones where the meter sits straight on top????