10-4
Now were gettin there.
There has to be a standard or set of standards to follow so that the
rest will follow.
On 8/16/2017 10:01 PM, Jaime Solorza wrote:
Your last line is why PIM testing and prevention is such a fast
growing business. We have standards to meet and are held accountable
at SCADA sites. We have inspectors check everything and final payment
can be held up until everything passes. Always try to do it right
first time...pays off in the future...
Jaime Solorza
On Aug 16, 2017 5:59 PM, "David Milholen" <[email protected]
<mailto:[email protected]>> wrote:
These are all good answers but there is more.
Definitely points to be made on other geographic areas and soil
content.
I do not believe for one second there isnt a tower that will NOT
get struck.
Thing about the energy that strikes is to channel that energy or
disperse it somewhere it
dissolves.
I have 3 sites that are all on mt tops and all are on the last run
for power. Not good combos for any tower.
As far as just giving up on a site because you lost a few $$ in
gear and saying there is nothing that can be done is the point to
be made here
how far would you go before condemning a Site unfit for service?
I have been put into position for our company to "FIX IT" per
say. So, for all practical purposes there is more than one site I
have definitely wanted
to throw in the towel. For some reason for me there is a fix or an
answer for the fix.
I always look to R56 for the standard of grounding and protection
and as tech changes so does the protection standards.
Now that I have taken that stance a majority of my issues for
sustainability and reliability have practically diminished. I also
follow the lead of other
telcos that we share the same tower and what they are doing for
grounding and prevention.
This only one phase of how for I would go. Field testing and using
the right tools and starting with the basics is just a small part
of finding the problem.
The very first and most important to me is looking at power coming
into the facility the source. The second is the tower itself.
Metal fatigue and rust can cause
some weirdo issues on a tower.
Contractors need to understand the importance of any project that
requires grounds and the standards that we want on those methods
of grounding.
I have seen poor irreversible crimp jobs on ground rings and cable
tray grounds.
On 8/16/2017 12:44 PM, Chuck McCown wrote:
Nice. Sounds like a PANI type of system.
*From:* Paul Stewart
*Sent:* Wednesday, August 16, 2017 10:10 AM
*To:* Animal Farm
*Subject:* Re: [AFMUG] how far and much
Great questions … and something I should have elaborated on for
sure…
Yes - each portion of the tower had it’s own isolated grounds
besides the tower itself. These went into a grounding grid built
around the base of the site. The guy wires were of course all
grounded out into their own grids as well.
The top of the tower was grounded and the bottom portion of the
tower was grounded - both on separate isolated runs.
The point of entry including the raceway to hold the cables were
grounded - the cabling (Heliax, LMR, and ethernet) all had
grounded surge suppression in that section on the building
exterior. On the building interior, there was an exact
replication of the outside (everything surge surpressed and
grounded away from building itself).
The building itself was elevated on concrete posts and two
grounds for the building itself were tied to the grid as I
recall. The concrete was made from a special mixture - wish I
could remember the name of this stuff but it’s supposed to
provide for additional protection going out to the grounding
grids around the building…
Each raceway, and portion of the lineups were tied into an
interior grounding block which was then ran outside.
This is all by memory …. It was literally at $2mil site with
equipment and tower. There was a company brought in for the
engineering aspects and another company specific to the grounding
portions.
Thanks,
Paul
On Aug 16, 2017, at 10:21 AM, Chuck McCown <[email protected]> wrote:
So, was the tower mounted equipment isolated with its own ground
wire?
Curious about the improper isolation at the entry point.
What was the proper way and what did the improper installation
do to violate that?
*From:* Paul Stewart
*Sent:* Wednesday, August 16, 2017 8:05 AM
*To:* [email protected]
*Subject:* Re: [AFMUG] how far and much
I’ve only ever encountered one tower (at former job) that was
pretty “bulletproof” …
The tower was 350ft and located on the highest elevation for
about 100 square KM area … so it was a prime target for
lightning strikes. I don’t know exactly how many times a year
it took a hit but would guess at 8-10 times per year it would
have a direct hit. There was only one time where any damage
occurred and it was because of some shoddy updates by a 3rd
party contractor whom didn’t do proper isolation at an entry
point (effectively bypassing some layers of protection).
That site had a full cellular deployment along with several
PTP600’s for backhaul and PMP320/PMP100 - with the cellular
being at the very top and the Cambium gear further down.
Paul
On Aug 16, 2017, at 9:11 AM, Eric Muehleisen
<[email protected]> wrote:
No such thing as a bullet proof tower. At least not in my area.
All the over-engineering in the world can't stop a direct
strike. Some days you get lucky, some days not. It's a roll of
the dice.
On Wed, Aug 16, 2017 at 7:29 AM, David Milholen
<[email protected]> wrote:
I am asking for pure simple curiosity.
How far would you go and how much would you spend to have a
bullet proof Tower site?
I am looking for answers in small class tower to super duty
types or leases.
What I mean by bullet proof is How many time a year are you
replacing gear due to weather complications
or how many times are you going to back to the site to reboot
something . How many times are you remoting into a
site to adj power or channels to avoid interference. How many
times are you having to make adjustments to ethernet ports.
All these tasks add up in time.
Our team this year has only had to visit 2 sites unexpectedly
due to weather and take the next step in making it bullet proof.
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