protection
Rich
ground cable from school to a stadium?
Frank Olson
> What type of lighting protection would you use on a 600 ft 25 pr under
> ground cable from school to a stadium?
>
>
Earl. He's cheap. And the beer cans make excellent lightning rods. :-)
nick markowitz
Ditek makes several excellent protecters for 25 pair wire as well as
Panamax.
"Rich" <rich...@comcast.net> wrote in message
news:QeqdnX73Tst_1DHY...@comcast.com...
w_tom
> What type of lighting protection would you use on a 600 ft 25 pr under
> ground cable from school to a stadium?
A protector is not protection. A protector connects that wire to
protection. Protection is earth ground. A protector that does not
shunt a surge into earth is often promoted on word association: "surge
protector = surge protection". Sounding alike does not mean they are
same.
An industry professional demonstrates the concept in an application
note. Two structures. Each has its own single point earth ground.
Any wire that interconnects both structures must be earthed where it
enters each structure. If any of those 25 pair wires cannot be earthed
directly, then install a surge protector from each wire to earth
ground.
This is how your telco - connected to overhead wires everywhere in
town - keeps their $multi-million computer working even during
thunderstorms. Every wire that enters the building is connected to
earth as short as possible. That protector is distant (up to 50
meters) from protected electronics. That separation inside the
building means additional protection.
Most critical is that the earthing be single point. Every incoming
wire must earth to the same earth ground. Each structure must have its
own single point earthing. See the application note TN CR 002 The
Need for Coordinated Protection at:
http://www.erico.com/public/library/fep/technotes/tncr002.pdf
Robert L Bass
> Every incoming wire must earth to the same
> earth ground. Each structure must have its
Very true. If every incoming service on the structure is connected to a single point ground there is a significant reduction in
damage from lightning. This is particularly important for sensitive electronics such as security and home automation systems.
Unfortunately, even when the installer correctly earth grounds the alarm, his system may still be unprotected if other tradesmen
don't follow code. In many areas the worst offender is the CATV company. They were notorious in New England and they still are in
Florida for failing to ground at all, grounding improperly to metal siding, piggy backing onto the electric panel ground, etc.
I routinely discuss bonded grounds with DIYers, especially on new construction. Just as with propfessionally installed systems,
other tradesmen are often at fault. Most electricians get it right but plumbers, CATV and even some telco installers screw up. I
also noticed when I first brought the subject up in this newsgroup some years ago that some alarm techs are unaware of the
importance of a bonded (aka single point) ground.
On a related subject, it bears repeating that the panel ground needs to be as short as possible. Bends in the ground cable should
be radiused -- no hard 90 degree turns. The best connection point it a ground rod sunk into the earth. Never ground an alarm panel
using an electrical outlet ground. There are a few plug-in transformer which include a ground terminal. Do NOT use that terminal.
It will not provide proper protection for the alarm system's electronics.
Mike Holt has useful information on grounding, bonding, etc., on his website at mikeholt.com. Note that most of his information
concerns safety grounding (keeping people alive) whereas the primary concern for alarm installation is protective grounding (keeping
electronics alive). Nonetheless, it's a very helpful website.
--
Regards,
Robert L Bass
=============================>
Bass Home Electronics
941-866-1100
4883 Fallcrest Circle
Sarasota · Florida · 34233
http://www.bassburglaralarms.com
=============================>
Norm Mugford
your info Mr. BAss?
Try going to the BBB website to get your
own poor business info.
Norm Mugford
"Robert L Bass" <rober...@comcast.net> wrote in message
news:yIKdnQ0ifq7Y7zPY...@comcast.com...
I choose Polesoft Lockspam to fight spam, and you?
http://www.polesoft.com/refer.html
Robert L Bass
I product information from the product manufacturers. I think that's better than simply making up "information" the way you do.
w_tom
> So you go to someone else's web sites to get
> your info Mr. BAss?
>
> Try going to the BBB website to get your
> own poor business info.
People who would advance mankind would say, "Thank you for providing
additional information. It was so useful." Those who just hate the
world, instead, would attack only because useful hyperlinks were
provided. Apparently Norm Mugford has so little basic electrical
knowledge and so does not want to learn as to not even understand the
value of those hyperlinks.
I brive a dus
FIRETEK
"w_tom" <w_t...@usa.net> wrote in message
news:1169261244.6...@a75g2000cwd.googlegroups.com...
> People who would advance mankind would say, "Thank you for providing
> additional information. It was so useful." Those who just hate the
> world, instead, would attack only because useful hyperlinks were
> provided. Apparently Norm Mugford has so little basic electrical
> knowledge and so does not want to learn as to not even understand the
> value of those hyperlinks.
>
And most anyone reading this post would say: "What the hell are you talking
about?"
I brive a dus
I think it involves a grasshopper and pebble but I'm not 100% sure
Robert L Bass
>> would say, "Thank you for providing
>> additional information. It was so useful."
>> Those who just hate the world, instead,
>> would attack only because useful
>> hyperlinks were provided. Apparently
>> Norm Mugford has so little basic
>> electrical knowledge and so does not
>> want to learn as to not even understand
>> the value of those hyperlinks.
>>
>
> And most anyone reading this post would
> say: "What the hell are you talking
> about?"
Too many words of more than one syllable for you, Olson?
Robert L Bass
> and pebble but I'm not 100% sure
It was actually a pair of chopsticks and a fly.
Doug
Doug
--
"w_tom" <w_t...@usa.net> wrote in message
news:1169261244.6...@a75g2000cwd.googlegroups.com...
>
w_tom
> I think it involves a grasshopper and pebble but I'm not 100% sure
He tripped on a pebble, crushed a grasshopper, and blamed it all on
Mike Holt?
Is Mike Holt really good? Does Norm Mugford have a problem with
pebbles, grasshoppers, and other things irrelevant. I understand Master.
Jim
Doug wrote:
> You can almost sense the collective rolling of the eyes
>
>
> Doug
>
> --
>
I thought I was the only one.
Norm Mugford
I think you have too many marbles on your keyboard?
BTW...Mike Holt is a very smart and well known guy.
He also supports his industry.......
Norm Mugford
"I brive a dus" <alarmi...@aol.com> wrote in message
news:1169269878....@s34g2000cwa.googlegroups.com...
I choose Polesoft Lockspam to fight spam, and you?
http://www.polesoft.com/refer.html
Robert L Bass
From your perspective, even Mike Sabodish would look smart.
> He also supports his industry.......
It's unfortunate that you don't take a clue from Holt. Instead of supporting the industry you behave like a rude child in a public
forum where anyone who realizes that you're on the ECLB is aghast.
you lie.@invalid.email IOW, you lie.
<rober...@comcast.net> wrote:
>Instead of supporting the industry you behave like a rude child in a public
>forum where anyone who realizes that you're on the ECLB is aghast.
No they're not. They're hoping he can do something to fill the
loopholes you've exploited.