"Kristy Ogilvie" wrote in message
news
On Sat, 15 Dec 2018 15:23:28 -0000, trader_4
wrote:

On Saturday, December 15, 2018 at 9:52:09 AM UTC-5, Kristy Ogilvie wrote:
On Sat, 15 Dec 2018 14:43:50 -0000, Harry Bloomfield
wrote:

Kristy Ogilvie brought next idea :
Where is this protective ground? There certainly isn't one in any BT
master
socket I've seen, just a couple of twisted pairs coming through a
plastic
tube to the socket.

Some service lines would be fitted with a ground connection in the
early GPO days, but I doubt any are now. Most likely there will be a
ground at the pole or the cabinet.

I assume this is only for overhead lines anyway, mine are underground.

Strangely some newer houses in the next block have overhead phone wires
(but underground mains wires). Did they forget them when building or
something?

Here in the US all phone lines I've seen had a surge protector installed,
bonded to ground, at the house, whether over head or underground.

You maybe get more storms there? I've not actually heard of any lightning
problems in UK phone lines.

Yes you have, a few like the turnip have reported losing a router to it.

There might be surge protectors within the main socket, but they're not
earth bonded.

I don't know why you have them protected if they're underground though.

You can get a substantial spike on underground phone lines with a close
lightning strike. You can also get the underground mulitipair cables fried
by lighting and have to be replaced after that too.