So this came up a number of years ago when a customer claimed that our antenna mounted on the side of his house was the cause of pretty much all electronic devices in his house getting fried after a thunderstorm. Interestingly our CPE (can’t remember if it was an UBNT or ePMP) was not damaged at all and our power supply was fine but his router and computer were fried (power supply on computer I believe).
Anyway, they got a building inspector involved trying to prove that our Cat5 cable was the source of the lighting coming into the house and frying everything (even though the Cat5 was perfectly fine…..). The end result was that our insurance company fought it and won BUT they insisted that we follow the code (which I can’t find right now and am too lazy to search too far for) that stated that grounding was required within 20ft of piercing the building envelope. They said we satisfied the requirement by using shielded cabling and plugging into a power supply that had a 3 prong outlet so that it was “grounded” to the electrical ground system of the house. I remember the code specifically referred to tv antenna wires needing this as well as any other wire that penetrated the envelope. But of course: And secondly, you must be a pirate for the pirate's code to apply and you're not. And thirdly, the code is more what you'd call "guidelines" than actual rules. Welcome aboard the Black Pearl, Miss Turner! From: AF <[email protected]> On Behalf Of Chuck McCown via AF Sent: Thursday, September 2, 2021 11:17 AM To: AnimalFarm Microwave Users Group <[email protected]> Cc: Chuck McCown <[email protected]> Subject: Re: [AFMUG] resistivity of cat5 I have always been told all grounds have to go to the building common point ground. So if that was farther than 20 feet then there is a conflict. Secondary ground rods are a no no here. From: James Howard Sent: Thursday, September 2, 2021 9:01 AM To: 'AnimalFarm Microwave Users Group' Subject: Re: [AFMUG] resistivity of cat5 We’ve been told the code applies to tv antenna wire as well. Anything that “pierces the envelope” by coming from the outside to the inside. From: AF <[email protected]<mailto:[email protected]>> On Behalf Of Chuck McCown via AF Sent: Thursday, September 2, 2021 9:52 AM To: AnimalFarm Microwave Users Group <[email protected]<mailto:[email protected]>> Cc: Chuck McCown <[email protected]<mailto:[email protected]>> Subject: Re: [AFMUG] resistivity of cat5 Does that include low voltage? Sent from my iPhone On Sep 1, 2021, at 7:18 PM, James Howard <[email protected]<mailto:[email protected]>> wrote: Is it a Wisconsin thing that you have a to have any wire that penetrates the building “envelope” grounded within 20 feet of penetration to meet code? Seems like if you have to ground it anyway within 20 feet of entry, put the POE there and then they can have their extender wherever they want along the rest of the run. From: AF <[email protected]<mailto:[email protected]>> On Behalf Of Steve Jones Sent: Wednesday, September 1, 2021 4:45 PM To: AnimalFarm Microwave Users Group <[email protected]<mailto:[email protected]>> Subject: Re: [AFMUG] resistivity of cat5 all but the exterior cable run of maybe 12 feet. theyre extending their building out and putting up another building in the current LOS On Wed, Sep 1, 2021 at 3:43 PM James Howard <[email protected]<mailto:[email protected]>> wrote: Just out of curiosity, if he can put a network rack at the midpoint, how much of this is inside buildings? From: AF <[email protected]<mailto:[email protected]>> On Behalf Of Steve Jones Sent: Wednesday, September 1, 2021 12:26 PM To: AnimalFarm Microwave Users Group <[email protected]<mailto:[email protected]>> Subject: Re: [AFMUG] resistivity of cat5 thats what i suggested trying first, customer wanted the extender, irritating he finally has caved now and will be putting a network rack in the midpoint and is going to place a managed switch there instead of all this other unsupportable cobbling. Sometimes we get a win. On Wed, Sep 1, 2021 at 11:55 AM Adam Moffett <[email protected]<mailto:[email protected]>> wrote: Maybe a dumb question, but has it already been tried without the extender? 400ft is beyond 100m, but not by all that much. It might just work without any faffing around. On 9/1/2021 11:16 AM, Steve Jones wrote: I have a customer fixed on using https://i.mt.lv/cdn/product_files/GPeRqg_190928.pdf to extend his epmp f300 radio run to 400+ feet. if im calculating this right there will be about a 10v drop on the 24guage cat5, taking the 30v down to 20. If it does manage to keep the radio powered i see it burning out the poe circuit. hes fighting me on putting the cambium PSU at the midspan point and using his own POE to power the extender. Ive been overruled about telling the customer no, so its happening, but I want to make sure my math is correct using https://www.rapidtables.com/calc/wire/voltage-drop-calculator.html 24guage, 30v, .5 amp, 400 feet shows 10v drop. but im not sure about the resistivity field this is a guy who runs constant latency monitoring and initiates tickets on every blip, so i see this radio move just becoming a nightmare with this midspan extender in play -- AF mailing list [email protected]<mailto:[email protected]> http://af.afmug.com/mailman/listinfo/af_af.afmug.com ________________________________ Total Control Panel Login<https://portal.reflexion.net/login?domain=litewire.net> To: [email protected]<https://portal.reflexion.net/address-properties?aID=242260993&domain=litewire.net> From: [email protected]<mailto:[email protected]> You received this message because the domain afmug.com<http://afmug.com> is on your allow list. -- AF mailing list [email protected]<mailto:[email protected]> http://af.afmug.com/mailman/listinfo/af_af.afmug.com ________________________________ Total Control Panel Login<https://portal.reflexion.net/login?domain=litewire.net> To: [email protected]<https://portal.reflexion.net/address-properties?aID=242260993&domain=litewire.net> From: [email protected]<mailto:[email protected]> You received this message because the domain afmug.com is on your allow list. -- AF mailing list [email protected]<mailto:[email protected]> http://af.afmug.com/mailman/listinfo/af_af.afmug.com ________________________________ Total Control Panel Login<https://portal.reflexion.net/login?domain=litewire.net> To: [email protected]<https://portal.reflexion.net/address-properties?aID=242260993&domain=litewire.net> From: [email protected]<mailto:[email protected]> You received this message because the domain afmug.com is on your allow list. ________________________________ -- AF mailing list [email protected]<mailto:[email protected]> http://af.afmug.com/mailman/listinfo/af_af.afmug.com ________________________________ Total Control Panel Login<https://portal.reflexion.net/login?domain=litewire.net> To: [email protected]<https://portal.reflexion.net/address-properties?aID=242260993&domain=litewire.net> From: [email protected]<mailto:[email protected]> You received this message because the domain afmug.com is on your allow list.
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