Static electricity to the eyeball?
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.
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