Re: House grounding
- From: "Joseph Meehan" <sligoNoSPAMjoe@xxxxxxxxxxx>
- Date: Tue, 11 Sep 2007 17:06:39 -0400
"bud--" <remove.BudNews@xxxxxxx> wrote in message news:d07d3$46e6f91e$4213ea50$20308@xxxxxxxxxxxxxxxx
w_tom wrote:On Sep 11, 1:36 am, bigjcw1...@xxxxxxxxx wrote:What would be the simplest way to ground my whole house from
lightning and other electrical mishaps. Or how to tell if it already is.
To avoid the third problem, all incoming utilities must be earthed
to same earthing electrode. IOW all utilities must enter the building
at a same location. If your utilities are widely separated, then one
solution uses a buried wire encircling the building so that all
utilities connect to a common ground system:
http://www.cinergy.com/surge/ttip08.htm
Not just the same electrode. The phone, cable, ... entrance protectors must connect with a *short* wire to the ground at the power service. Widely separated utility entrances can produce a high voltage between signal and power wires that can damage equipment connected to both. The IEEE guide provides an example starting pdf page 40. I see no reason to believe the schemes in w_’s link would significantly help. The IEEE guide says that if the utility entry points are distant "the only effective way of protecting the equipment is to use a multiport [plug-in] protector."
earthing defines quality of surge protection; a surge protector is
only as effective as its earthing.
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).
Another with an agenda will say anything to avoid that fact.
My only agenda is accurate information. That is why I posted links to reputable guides from the IEEE and NIST. Read them for yourself.
But his
own citation says exactly what a protector does. On page 17 (of 24)
in
http://www.nist.gov/public_affairs/practiceguides/surgesfnl.pdf
What does the NIST guide really say about plug-in suppressors?
They are "the easiest solution".
and:
"Q - Will a surge protector installed at the service entrance be sufficient for the whole house?
A - There are two answers to than question: Yes for one-link appliances, No for two-link appliances [equipment connected to power AND phone or CATV or....].
Actually I believe that is not exactly true. Point of entry protection can provide good protection (how good depends on the quality, which goes for all suppressors), but it can not provide protection from internal sources. So a problem in your home can damage equipment in your home.
Since most homes today have some kind of two-link appliances, the prudent answer to the question would be NO - but that does not mean that a surge protector installed at the service entrance is useless."
Some of what w_ says is quite good. What he says about plug-in suppressors is nonsense. For reliable information on surge protection read the IEEE and/or NIST guides. Both say plug–in suppressors are effective.
Then read w_’s sources that say plug–in suppressors are NOT effective - oops - he doesn’t have any sources.
–
bud--
--
Joseph Meehan
Dia 's Muire duit
.
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