Extending cat5e - Help!
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Posted by RC on August 10, 2005, 11:59 pm
Please log in for more thread options Simple solution is lightning protection on both ends, should be able to pick it up anywhere that sells commercial cabling. Just make sure the fuses are for DATA not analog voice. I've seen this save a lot on equipment. And keep some extra fuses handy. Fiber is better, but this works without repulling the cable. Also it will provide a punk-down point for extending the cable from the fuse box area. If fact it works better that it's near the fuse box since you need to ground the lightning protector and your building ground is probably right there. >> Robert Redelmeier wrote:
>>> This is _very_ bad practice. Any nearby lightening strike will
>>> impose ground differentials that will fry equipment at both ends. >>
>> Can you tell me more about this? The cable is heavy indoor/outdoor, >> protected in side a conduit and buried about a foot underground. >
> It doesn't matter how good the cable, or how deep it's buried. > > During a nearby lightening strike ground potentials are not > the same. There's a pattern of high ground potential near the > strink dropping off to lower ones further away. Typically kV/m > but it won't be linear. I'd roughly say any strink within 100m > (or 3x groundstake separation) will cause trouble. > > Lets say lightening hits a tree [electrically] closer to building > A than building B. The groundstake on building A goes to a higher > voltage than the groundstake on building B. Your interbuilding > Cat5 becomes a tempting path to relieve this differential, and > anything in the way can get fried. The ethernet transceivers have > 500V isolation, but that's nothing when talking about lightening. > >> How could this be done differently?
>
> With fiber. An alternative (if you can find them) is Cat5 service > entrance protectors, properly bonded to each building's ground. > > -- Robert > | |||||||||||||||||||||||||||||||||||||
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Posted by Smowk on August 15, 2005, 11:16 am
Please log in for more thread options coupler...??? | |||||||||||||||||||||||||||||||||||||
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