Re: Fiber-optic isolator?

On Feb 8, 11:40 am, "Lloyd E. Sponenburgh"
<lloydspinsidemindspring.com> wrote:
Oh, well... I do NOT want to have to replace the components every time
we get a strike on the lines down our road. ...
That's likely to happen in any event unless you install serious
lightningprotection.
,,, The considerations for _guaranteed_ thrice-annual
strikes on incoming service are costly, but do-able.

First, routine to have direct strikes and no damage. Your telco
connects its $multi-million computer to buildings, via overhead wires,
all over town. Every thunderstorm typically creates maybe 100 surges
- without damage. If every wire is earthed where entering the
building, then lightning need not seek earth ground, destructively,
via interior electronics.

Same solution was installed in FL's Orange County Emergency Response
facilities. Protectors and isolation were not a solution:
http://www.psihq.com/AllCopper.htm

A first building may act as a lightning rod to find earth ground,
destructively, via electronics in the second building. Solution was
discussed recently. This problem and a simple, inexpensive solution
that was standard even 100 years ago is in "Long cat5 run question" in
alt.internet.wireless on 24 Jan 2008 at:
http://tinyurl.com/2h69ho

Second, any protector destroyed by a surge was not providing
protection. But failure (by being grossly undersized) gets myths to
promote those effective and grossly overpriced solutions. The
standard protection system means a direct lightning strike and
resulting surge is not even known. Properly earthed protection is that
routine and effective that nobody knows when it happens. Earthing
defines quality of any surge protection 'system'; including essential
short (low impedance) connections from each wire to a single point
earth ground.

Third, a least expensive solution is also most effective. Only one
component is always required in every surge protection system: earth
ground. That requirement applies to every incoming wire - not just a
Cat5 cable. Damage is created when a surge is permitted inside the
building - permitted to find earth ground, destructively, inside that
building. One path might be incoming on AC electric and outgoing to
earth via that Cat 5 wire. Do not assume damage on a Cat 5 cable is
due to a surge entering on Cat 5 wires. A surge could also be
incoming on AC mains and outgoing to earth ground, destructively, via
Cat 5 wires.
.

Relevant Pages

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