i.e. trying to create a ground loop.
On 9/2/21 9:17 AM, Chuck McCown via AF wrote:
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 <af-boun...@af.afmug.com> *On Behalf Of *Chuck McCown via AF
*Sent:* Thursday, September 2, 2021 9:52 AM
*To:* AnimalFarm Microwave Users Group <af@af.afmug.com>
*Cc:* Chuck McCown <ch...@go-mtc.com>
*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 <ja...@litewire.net> 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 <af-boun...@af.afmug.com> *On Behalf Of *Steve Jones
*Sent:* Wednesday, September 1, 2021 4:45 PM
*To:* AnimalFarm Microwave Users Group <af@af.afmug.com>
*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 <ja...@litewire.net> wrote:
Just out of curiosity, if he can put a network rack at the
midpoint, how much of this is inside buildings?
*From:* AF <af-boun...@af.afmug.com> *On Behalf Of *Steve Jones
*Sent:* Wednesday, September 1, 2021 12:26 PM
*To:* AnimalFarm Microwave Users Group <af@af.afmug.com>
*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
<dmmoff...@gmail.com> 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
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