Serge wrote:
For the phone line, yes. A few years ago we had a very-near lightning hit.
The surge came in through my phone line, wiped out the 14.4 modem and a
couple of chips on the MB; the rest of the PC and the peripherals were OK.
The power line went through a line conditioner before my PC, so I'm sure
the surge source was the phone line (as if the blackened EISA modem board
wasn't enough of a clue).

The Ethernet cable should be safe, unless you've run that cable outdoors
and didn't run it through a pipe or ROMEX.

If your broadband line is Fios DSL, I'd guess that was safe, since fibre
doesn't conduct electrons. If your broadband is copper DSL, check with your
DSL vendor; I don't know how or where the DSL mux is grounded.
--
Cheers, Bob