I understand the current BT guidance is for a single unjointed wire from the top of the pole to your NTE5.
Our quality guides permit one joint between the DP (Pole) and the first socket. Of course, ideally it would be one continuous length but this isn't practical some times. For example, lets say the drop-wire has gone faulty through rubbing on tree branches over a period of time. Our remit would be to replace the whole wire Pole-to-NTTP, (Master socket or a junction box such as a BT80).
However, it may not be possible for a variety of reasons ranging from safety, to the EU not wishing to have any holes drilled. Ergo, we are allowed to install an 'Overhead Closure' at a suitable place. For info, the BT one in the picture is called a BT16 and are now obsolete.
We now use a black cylindrical tube-like design, lovingly called a 'Sausage' around these parts. In my opinion (and others for that matter), the BT16 is a far superior product.
For further info regarding our terminology, if anyone is remotely interested ............ the 'Twiddle' that B*Cat refers to is simply called a drop-wire clamp (I now prefer 'Twiddle').
The 'Figure of eight' wiring after the clamp, should really be a circle of wire and is termed as a 'Future Loop' and is put in for the very reasons discussed above, to be able to cut into it in order to fault-detect or perform remedial work.
Again, as B*Cat has pointed out, that foreign connection block has probably been introduced into the installation as a result of the glaziers accidentally cutting our wire whilst going about their work. A common occurrence.
