Hello Westom and thank you very much indeed for your kind reply. I in no way profess expertise nor anything remotely close to it in terms of electrics and electronics, although I feel I should confess to originally having studied Mechanical Engineering and as a direct consequence, a bit of electrical engineering too. A precursor for this study was a good grade at higher physics which was satisfactorily achieved
As I say, I do not profess expertise in any way but am somewhat familiar with the properties and wants of electrical current and how it likes to flow and surge, etc. but I'm grateful for your reply
I have no idea if telephone exchanges have surge protection the phone lines, but if you tell me they do, then I'm happy to accept that and all that you say
If I pick you up correctly, you say that the phone line isn't the culprit as I'd said in my original post here, but that you say the issue is with the electrical mains side of things.
Our poles locally are not multi purpose. We have poles with mains electricity (and transformers at each 'take off' point). We also have separate poles which carry the copper phone lines for quite a distance.
This means that there is no hierarchy of cables on the poles here so if a pole is struck, that is the cable that pole carries will take the brunt (or surge down the wire assuming most of the belt shot to earth). Let's assume the lightning strike was on the overhead lines between the exchange and the affected premises (there were lots of affected premises btw). The telephone exchange surge protector works at the exchange. As it happens, this is a fairly small rural exchange and one of the line cards in the exchange and some other equipment was also blown to smithereens, it took a good month for things to be repaired in there! Let's next be sure in the knowledge that there was NO surge protection on the telephone line at the end users address. The strike hit the line (or a pole), the surge went in both directions along that line - to the exchange and did whatever damage it did there and in going down the line in opposite direction towards the end user premises where it did serious damage there too.
I kid you not, the small, white, rectangular box on the window sill that changes the external BT cable to internal type blew up and became a smouldering lump of blackened plastic with shards of it exploding across the room. In a split second after that the surge then destroyed NTE5, then carried on to the router - again it exploded and what was once a nice white router is now a blackened lump of blown up and melted plastic. As the network was wired it also passed on down the RJ45 side of the router breaking the switch, network connection in the NAS and the OB networking of a computer.
The problem is very much that a heavy lightning surge came down the phone line and did this damage and I cannot believe this is a one off which makes me think there must be an option for surge protection on phone lines at end user premises.
Pease can I ask again if anybody has any knowledge of a decent surge protector for RJ11 connections, or just phone lines in general? I'm quite happy if it needs a separate cable taken to the earth mains to take the surge away to earth, easy to wire a plug to do that but I just can't find anything? I doubt that much protection would be afforded on this given the power of the blast that nit, but anything would be better than nothing
I truly would be grateful for any help. Thank you.