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Subject: Re: Ground Resistance monitor
Date: Mon, 28 Oct 2002 16:56:50 -0500
Organization: Posted via Supernews, http://www.supernews.com
X-Mailer: Mozilla 4.75 [en] (WinNT; U)
References: <3DBA8DBA.6205CB0A@execpc.com> <3DBB2BEF.40C7ED0B@hotmail.com> <3DBD5CEC.86AFAFE3@boeing.com>
Further information on earthing techniques and testing of
http://leminstruments.com to register then read tutorial
Earthing a building and grounding inside the building are
two different functions that operate in conjunction. The
above is about earthing - different from safety grounding
which that neon lamp tester tests only for failure.
Paul Hovnanian wrote:
> Those neon outlet testers don't tell you anything usefull about the
> grounding system resistance at the outlet. You could light a neon
> lamp with a few Kohms in the circuit. All these are good for is to
> reveal wiring mistakes.
> > 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.
> 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.
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