Identifying cables

[happyhacker]

I have two cables entering my house. One is black and about 20mm dia. which I assume is the power. Another is a translucent sleeve cable and I can see armour wire underneath. What is that cable? an earth? House is mid 70s and the cables are the original I think.

 

[Sintra]

Is it like this.

 

[happyhacker]

It's the telephone cable! Fooled me because it was so big.

 

[RWJ]

You should see the size of the one coming in to the Hotel I "seem to live at" It looks like 10mm 4 Core SWA