On Wed, 2022-02-23 at 10:41 -0400, George N. White III wrote: > I used to add surge protection to power bars. We had a tree fall on > the cable coax that they had installed without a proper anchor, just > a zip tie to the mast for the AC power. The mast was pulled off the > house, which meant the neutral line got disconnected first, and > lightbulbs went off like flash bulbs. My Victor 9000 PC with the > home-made surge protection survived, but we lost the doorbell > transformer and a radio (and the thyristers in the surge protector). I've always been a bit wary of ones in power boards (the multi-socket adaptors on short leads. Ideally surge protection should be at the distribution box (to protect the whole house from surges from the street). You really want the house to disconnect from power under dangerous conditions, not just a board with potentially (now) hazardous wiring still energised between it and the wall. If you pull apart power boards, you often notice how thin the wiring is, and the metal strips used to form the sockets. You've got a good chance at weakening or blowing the board instead of the main fuse. Even under good wiring circumstances the fuses and breakers may not be quick enough to break the circuit. Some of the boards use inappropriate over-voltage clamping that's always being driven warm by triggering too close to the normal mains voltage (possibly this is manufacturers of 110 volt equipment selling their products into 240 volt markets). I've come across some that are always too warm for my liking, and wouldn't like them being buried and out of sight. I've seen them discoloured and deformed plastic. People have a habit of daisy chaining power boards. EMI filters and surge protection at the end of the line puts heavier workload on ones nearer to the socket, and all the joins between. Advice was that if you have to have more outlets than available on one board, the first one plugged into the wall should be the one with filters and protection, then plug other plain unprotected boards directly into it, rather than string a series of boards through each other. The first board protects the rest, rather than the rest stressing out everything. -- uname -rsvp Linux 5.11.22-100.fc32.x86_64 #1 SMP Wed May 19 18:58:25 UTC 2021 x86_64 Boilerplate: All unexpected mail to my mailbox is automatically deleted. I will only get to see the messages that are posted to the mailing list. _______________________________________________ users mailing list -- users@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe send an email to users-leave@xxxxxxxxxxxxxxxxxxxxxxx Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/users@xxxxxxxxxxxxxxxxxxxxxxx Do not reply to spam on the list, report it: https://pagure.io/fedora-infrastructure
