unknown circuits in CU

[timtheenchanter]

next month I am doing some alterations to the MILs electrics, they are having building work done which is being notified, and this is coming under that.

existing: Lighting
Ring Final
Cooker
Immersion

basics are:
add shower and circuit back to C/U
upgrade existing protection to RCBO for ring final.

was down there at the weekend, so had a look to see what I would need, and found on the ring final another circuit connected via 4mm T&E.

did some investigating, and could not find what it was for, would it be acceptable to insulate this, and leave marked as an unknown circuit in the C/U? i'm reluctant to cut it back/drag it out as far as poss incase we find what it was in 6 months time.

if not acceptable to leave in the C/U it could be pulled back up into the roof void and left suitably insulated/marked.

 

[electronicsuk]

Yes, there's nothing wrong with disconnecting and isolating it but leaving in the CU enclosure, as long as it's secure and isn't going to make contact with any live parts.

 

[1john]

You could also place all three conductors together in a spare earth terminal.

 

[Taylortwocities]

Yes, best to keep them and terminate ito earth.

In a few days they may say, "hey the socket in the greenhouse doesn't work". And then you'll know what that 4mm is for.

 

[timtheenchanter]

cheers, what I thought anyway, they test open circuit, but that doesnt mean much really, could be a switched off light/socket with nothing in it.

tied to earth it is...