Re: Linksys router + switch vs router/switch combo

On Oct 3, 10:30 am, w_tom <w_t...@xxxxxxx> wrote:
On Oct 2, 12:55 pm, thepixelfreak <n...@xxxxxxx> wrote:

I'm talking about a power strip surge suppressor that has power outlets
as well as a coax connector that goes between the wall coax and the
cable modem. e.g.
http://catalog.belkin.com/IWCatProductPage.process?Product_Id=300414

Excellent information on surges and surge protection is in an IEEE
guide at:
http://omegaps.com/Lightning%20Guide_FINALpublishedversion_May051.pdf
And one from the NIST at:
http://www.nist.gov/public_affairs/practiceguides/surgesfnl.pdf

The IEEE guide is aimed at those with some technical background. The
NIST guide is aimed at the unwashed masses.


So where does that unit claim to provide any protection? I don't
see any claim. Whereas an effective surge protector must have a short
connection to earth, where is the earthing connection on that Belkin?

w_ has a religious belief (immune from challenge) that surge
protection must use earthing. Thus in his view plug-in suppressors
(which are not well earthed) can not possibly work. The IEEE guide
explains plug-in suppressors work by CLAMPING the voltage on all wires
(signal and power) to the common ground at the suppressor. Plug-in
suppressors do not work primarily by earthing (or stopping or
absorbing). The guide explains earthing occurs elsewhere. (Read the
guide starting pdf page 40).


What happens to protectors that really don't provide protection, are
too close to computers, and also don't claim to provide protection?
Sometimes these scary pictures:
http://www.hanford.gov/rl/?page=556&parent=554

w_ can't understand his own hanford link. It is about "some older
model" power strips and says overheating was fixed with a revision to
UL1449 that requires thermal disconnects. That was 1998.

Energy from
lightning must be absorbed somewhere. Is energy dissipated inside
that silly little (and grossly overpriced) Belkin box? Of course
not.

Of course not. Plug-in suppressors work by clamping, not earthing.
Read the IEEE guide.

Note that all interconnected equipment needs to be connected to the
same plug-in suppressor, or interconnecting wires need to go through
the suppressor. As pixel said, external connections, like cable, also
need to go through the suppressor. Connecting all wiring through the
suppressor prevents damaging voltages between power and signal wires.
These multiport suppressors are described in both guides.

According to NIST guide, US insurance information indicates equipment
most frequently damaged by lightning is
computers with a modem connection
TVs, VCRs and similar equipment (presumably with cable TV
connections).
All can be damaged by high voltages between power and signal wires.

Both the IEEE and NIST guides say plug-in suppressors are effective.

--
bud--

.

Relevant Pages

  • Re: House Power Failures and Mac
    ... "How to protect your house and its contents from lightning: IEEE guide for surge protection of equipment connected to AC power and communication circuits" published by the IEEE in 2005. ... Any surge suppressor in the US should have a UL1449 listing. ... that short connection to earth has THE only ...
    (comp.sys.mac.apps)
  • Re: what is the differences between whole house surge protectors?
    ... A plug-in suppressor protects the TV connected to it. ... guide says "the only effective way of protecting the equipment is to use ... also install protection connecting lightning to earth: ... suppressors are effective. ...
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  • Re: Question about surge/lightning protection
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    (rec.games.video.arcade.collecting)
  • Re: UPS service not configured correctly?
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