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From: email@example.com (N. Thornton)
Subject: Re: Ground Resistance monitor
Date: 30 Oct 2002 05:25:39 -0800
References: <3DBA8DBA.6205CB0A@execpc.com> <3DBB2BEF.40C7ED0B@hotmail.com> <3DBD5CEC.86AFAFE3@boeing.com>
NNTP-Posting-Date: 30 Oct 2002 13:25:40 GMT
Paul Hovnanian wrote in message news:<3DBD5CEC.86AFAFE3@boeing.com>...
> w_tom wrote:
> > To test for earth ground, the measuring system must complete
> > a circuit that includes the earth ground rod. If a meter
> > connects to an outlet, then where is the other side of a
> > complete circuit that passes through earth ground rod? No
> > circuit through the earth ground connection means no valid
> > test of earth ground.
> This is correct. At a minimum, the ground test will require
> two additional ground electrodes to be installed for a test.
> A current is run between the ground rod and circuit under
> test and a high current test probe. The resulting voltage
> drop will be measured between the rod under test and a voltage
> probe. The physical layout of the test probes is important and
> will require seperations of many feet.
If you think laterally you'll notice that the live and earth lines are
close to earth potential from an rf point of view: hence one can test
without introducng an extra rod.
> This sort of test is usually run prior to placing the grounding
> system into service. I think that any attempt to build this
> capability into the proposed equipment would violate NEC rules
> since it would intentionally energize the grounding electrode
> and system.
I dont see anything wrong with doing that at low voltage, and with non
hazardous currents. Now sultanas - they would be unacceptable :)
Do you think the rf test might work?
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