With growing numbers of POE cameras mounted outdoors which are connected directly to a LAN with expensive computers and NAS and other equipment, how does one minimize the potential damage that can be caused by a lightning strike?
Best, Christopher
"Christopher Glaeser" a écrit dans le message de groupe de discussion : VJudnb6eNNjpODPXnZ2dnUVZ snipped-for-privacy@giganews.com...
Simple..
use different switch for both system..
one for the security camera, the other for the rest of the lan..
And at the same time you are giving yourself a chance of bottlneck caused by the mixing of the 2 data..
I have separate switches for cameras and the rest of the LAN, but will the POE camera switch protect the rest of the LAN and everything attached?
From a direct hit? Not a chance. From a near miss? Not likely. From a distant miss. Maybe if there is a direct solid conductor to ground.
National Electrical Code section 900 requires Surge protection equipment on outdoor wiring entering buildings. that goes for all low voltage cables. To prevent and deter lightning from entering a structure. look at any telco or cable install they do so should you. Do not do it and a strike hits a pole and comes in and destroys a network or worse yet causes a fire and plan on getting your butt sued. First thing looked at by an insurance investigator when there's a claim is to check and see that the installation meets all applicable codes. If it does not expect to get cited as the cause of the failure. I know because i do investigations for insurance companies.
I have had several direct hits where lightning has hit structures and there was damage but the surge protectors along proper bonding and grounding protection limited it and also helped prevent the structure from catching fire.
That said a number of manufacturers make surge protection products for networks including Ditek, Stormin Protection etc. both plug in and punch down.
Interesting... anyone know if Canadian electrical codes are similar?
Ever heard the term "Thousand Foot Lightning Protection" ?
Exactly the same.
Except for that part about grounding the plactic boxes.
A surge caused by lightning or a direct hit? There are plenty of products like the Ditek DTK-RM12POE. For a direct hit you'll need that DeLorean DMC-12 from "Back to the Future" to go back and get it all disconnected and powered down BEFORE the hit.
Just make sure you're doing precisely 85 mph
Canadian codes are actually stronger than in US in many cases including ULc Listings
Direct hits can be stopped but it takes all kinds of specail grounding and equiptment like we use on transmission towers.
the whole idea why NEC wants surge protection is to limit damage from a direct hit and prevent a fire.
Not only that, but they also provide healthcare for every citizen. As Yakov Smirnoff would say, "What a country!"
Electronic devices in metal boxes, the use of shielded wiring, whole house surge protection (AC), surge protection at each outlet with electronic devices, and MOV's (Metal Oxide Varistors) installed in parallel on the low voltage side of electronic power transformers.
The idea of metal boxes and shielded wiring is called a "Faraday Cage". This is also covered in military technical papers on "EMP" (Electromagnetic Pulse).
More... Faraday Cage...
An outdoor POE installation may include cat 5, 18 gauge for IR power, and 22 gauge for alarms. Do you use shielded versions of each? Can you recommend a product / supplier for these?
Best, Christopher
No they "think" they do which is why a lot of them come down here for care
Actually, far more American citizens have been going to Canada and other countries to obtain health care. But don't let the facts scare you off. Just keep believing that your Republican senators are looking out for your best interests by maintaining the status quo. They don't *really* work for the insurance industry. That's just a nasty rumor spread by some whacko woman shooting wolves from a helicop... umm, never mind.
Check this out, oh uninformed one:
"However, those who are still skeptical about standard of care in America and Canada, should take a close look at the facts provided:"
- Average in-hospital treatment costs are nearly twice as much in the U.S. ($20,673 U.S. vs. $10,373)
- There are 9.9 qualified nurses per 1000 population in Canada as compared to
7.9 nurses per 1000 population in US (so you get a highly personalized care!)- Overall satisfaction with the surgical experience is similar in both countries (85.3% U.S. and 83.5% Canada).
- The number of acute care hospital beds in Canada is 3.0 per 1000 population as compared to 2.8 in US
- Canadians have lower rates of in-hospital mortality (1.4% Canada vs. 2.2% U.S.).
- Administrative costs consume more of the total cost of treatment in the U.S. (38.2% of total costs in the U.S. vs. 31.7% in Canada).
- In-hospital cost of coronary artery bypass graft surgery (CABG) in the U.S. is 82.5 % higher in the U.S. than in Canada.
- The mortality rate for end-stage renal disease is 47% higher in the U.S. than in Canada. Adjusted monthly costs of treatment are $503 higher in the U.S.
- Fifty-seven percent (57%) of U.S. patients have reprocessed dialyzers used on them, compared with 0.0% of Canadian patients.
- Compared with the American counterparts, low-income Canadians have a significant survival.
- Advantage for 13 of the 15 kinds of cancer studied.
- One-year mortality rates following myocardial infarction are virtually identical for both countries (34.3% U.S. vs. 34.4% Canada).
- Canada has a higher rate of annual bone marrow transplants (0.89 per 100,000 population vs. 0.81 per 100,000 in the U.S.)
- Canada has lower mortality rates for patients 65 and older three years after both low-mortality (18.52% U.S. vs. 15.31% Canada) and moderate-mortality (19.19% U.S. vs. 16.63% Canada) procedures.
-- Survival rate for four disease condition is higher in Canada than in America: + Colorectal cancer: 113 Canada vs. 108 U.S. + Childhood leukemia: 118 vs.110 + Kidney transplants 113 vs. 100 + Liver transplants 123 vs. 102
- Above all, American citizen do not need visa if the length of stay is less than 180 days.
- The prescription drugs and medicines are far less expensive in Canada.
"The high cost in America is mainly attributable to higher resource prices for products and labor and higher overhead costs resulting from a non-socialized medical system."
"In addition to the cost effective medical care, medical tourism to Canada is an opportunity to explore places of interest and relax in beautiful ambience - an opportunity worth grabbing indeed!"
You can get shielded wire for just about any type of low voltage wire. (Get out your checkbook though!)
Might try a local electrical supply (where electricians go shopping). Ask who their low voltage wire suppliers are (like Belden), then browse their web sites. Or they may have a catalog there or could give you one for shielded wire of different types.
There are all sorts of manufacturing facilities these days with high voltage machinery, electric motors, arc welding equipment, etc. (emitting all sorts of electrical noise) and everything is computer controlled - all sorts of low voltage sensors. So quite common to use shielded wire in those harsh environments.
Also in the life support/hospital equipment areas, they want to keep out all outside noise from their equipment wiring (cell phones, etc.) So again quite common to use shielded low voltage wiring.
But they won't have this stuff at home improvement stores typically except for quad shielded TV RG-6 coax cable.
Also you can search google.com for... shielded cable shielded wire shielded cat 5 wire etc.
P.S. In the security system business, shielded wire can be used for running regular sensor wires where there are "critters" (rats/mice) chewing on the wires. This will put a stop to that!
I ain't ever goin' to live that down, am I?? :-)
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