What’s this.

[Russell griffiths]

So starting to run new services to our plot and I have had to uncover the duct that the BT cable runs in. See pic. 

 

Running down the side of the duct is a thin wire just like bell wire, any thoughts on what it is 

 

I have my ideas, but what’s yours. 

 

Thanks. Russ. 

[Dee J]

Looks like old GPO overhead pair. Maybe there to give something to detect, or early warning to excavator drivers....

[Onoff]

If it's similar to this then yep, old GPO drop cable:

 

 

And for some light bedtime reading:

 

http://www.britishtelephones.com/gpo/overhead.htm

 

[Russell griffiths]

I was also thinking it maybe for detecting the duct 

 

any others before I fill it back in. 

[Construction Channel]

3 hours ago, Russell griffiths said:

I was also thinking it maybe for detecting the duct 

 

any others before I fill it back in. 

 

Put a switch on it and flick it a few times just to make sure. It could be the lead from the big red button. 

[Temp]

4 hours ago, Russell griffiths said:

I was also thinking it maybe for detecting the duct 

 

But you could just as easily detect the cable in the duct.