I ran into one situation where there were two wires running up a hill on poles.
The customer could put power on one or the other. At the far end they both
controlled a little gearmotor that turned the knob on a UHF to VHF convertor.
The VHF came back to the house on those two power lines. Power one one wire,
clockwise, power on the other counter clockwise....
And of course the return circuit was a ground rod.
From: Ken Hohhof
Sent: Tuesday, January 15, 2019 10:47 AM
To: 'AnimalFarm Microwave Users Group'
Subject: Re: [AFMUG] SCADA porn
I hope the green wire ground isn’t now filling in for a missing neutral. I
have run into electricians out in farming country who treat ground and neutral
as interchangeable, as in if the neutral or ground bar in the breaker panel is
full or inconvenient or missing (as in the case of some wild leg 3 phase farm
setups which don’t use a neutral wire), they just use the other one. Because
“ground is ground the world around”. Sometimes in farmhouses they will have a
surge strip with the fault light always on, and you check out the wiring to
the grounded wall outlet, and someone has just connected the ground screw to
the white wire.
From: AF <af-boun...@af.afmug.com> On Behalf Of ch...@wbmfg.com
Sent: Tuesday, January 15, 2019 11:15 AM
To: AnimalFarm Microwave Users Group <af@af.afmug.com>
Subject: Re: [AFMUG] SCADA porn
Always good to keep anything conductive bonded to everything else. Shock
prevention. Corrosion protection.
From: Nate Burke
Sent: Tuesday, January 15, 2019 8:20 AM
To: AnimalFarm Microwave Users Group
Subject: Re: [AFMUG] SCADA porn
I think this answers the why question "Some extra grounding was called for as
per engineers" They probably don't actually know why it's needed.
I just involved in a building project involving a 90hp Fire alarm sprinkler
pump. One single power phase kept randomly going to undervoltage and setting
the monitoring system into alarm. The Manufacturer said "We don't know why
it's doing it, try adding another ground wire and see what happens" The
Electrician said "That can't fix it, but I'll do it because you said so" Well,
it fixed it, for some reason that nobody really understands or has been able to
adequately explain.
On 1/15/2019 8:08 AM, dave wrote:
what is that ground for?? Looks like a ground to an outer seal of some sort.
On 1/14/19 8:36 PM, Jaime Solorza wrote:
Thanks. First time using the new Phoenix Contact managed switch...will
share experience once we get things going... Some extra grounding was called
for as per engineers...
On Mon, Jan 14, 2019, 4:53 PM David M <dmilho...@wletc.com wrote:
I finally got a good source for most of the interconnects,din rail and
wire management stuff.
I always like good clean boxes.. Awesome!
On 1/14/2019 3:41 PM, Jaime Solorza wrote:
Starting year off busy...
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