My avionics shop in Vietnam in 1970 had a similar problem. A 40 watt bulb
would light up if connected between the AC safety ground and an earth
ground at the building. This turned out to be due to unbalanced loads and a
loose connection about a half mile away.
Cortland
The worst case of ground potential difference that I have heard of is a case
where guy got a shock from the grounded metal reflector of his trouble light
while working outside on his car.
Turns out the pump in his neighbor's well (fed from the same transformer) had a
short from from lin
I've no publications, but I did have personal experience with the
more destructive results with ground potential differences. At another
company, I witnessed the insulation of a coax cable melting after
being connected between equipment in a lab where I worked. The
problem being a differen
Bob Johnson
ITE Safety
-Original Message-
From: owner-emc-p...@majordomo.ieee.org
[mailto:owner-emc-p...@majordomo.ieee.org] On Behalf Of John Woodgate
Sent: Saturday, October 12, 2002 12:53 PM
To: emc-p...@majordomo.ieee.org
Subject: Re: Ground potential differences
I read in !emc-pstc
Jeff,
I used to develop network interfaces for printers at IBM and Lexmark.
As I recall, the Ethernet 10BASE2, 10BASE-T, and 100BASE-Tx standards
required 1500V isolation between the network cabling and the product.
This was no problem for 10BASE-T and 100BASE-Tx, because the
transformers easily
I read in !emc-pstc that Bailey, Jeff wrote (in
) about 'Ground
potential differences' on Fri, 11 Oct 2002:
> I am interested
>to know what the actual magnitude of ground differences may be from one end
>of a plant to another as well as where the numbers come from.
It depe
Greetings all,
I have become involved in a discussion regarding potential ground voltage
differences between opposite ends of long network lines in industrial
locations. As I understand it these differences are the reason for some
network types floating cable shields or connecting them through s
Hi Doug:
> Without knowing the issue, we connected two different machines
> with a coax. Each machine eventually connected to different
> substations by way of differently sourced outlets. And we
> watched with amazement as the rubber jacket of the coax melted.
> All with a 1
f Consuemr Electronic Equipment
(After Sale)
- Original Message -
From: "Doug"
To:
Sent: Saturday, May 06, 2000 1:18 PM
Subject: Re: Ground potential differences
>
> I'm going to stick my neck out here and say from two
> experiences with this topic, there&
power involved.
And that would be have to tested some other way.
- Doug McKean
Kelly Tsudama wrote:
>
> Hi gang!
>
> I have been asked to look into ground potential differences by one of the
> teams that I support. Can any of you provide any insight on how I can
> de
dealing
with "ground potential differences" is: What is
the reference? I will assume it is the body of
the earth, a non-current-carrying earth rod.
The second question that must be asked is: What
is the source of current that causes the voltage
drop across the resistance (due to the
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