Shane,
Jumping in here...Like you, I use an advanced device for measuring earth
resistance. It's a clamp-on earthing tester from AEMC. But if you're
discussing bonding resistance, a Simpson 260 or DMM should be fine. One of
the most accurate tests for bonding resistance is a DMM with 4-wire Kelvin
probes. I cannot imagine a licensed electrical contractor losing a license
using that method of bonding measurement.
Paul, W9AC
-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces@contesting.com] On Behalf Of Shane
Youhouse
Sent: Wednesday, January 13, 2016 8:13 PM
To: towertalk@contesting.com
Subject: [TowerTalk] Bonding and geounding
Jim,
Having taught bonding classes for a decade, you really should know that a
Simpson 260 is completely worthless for ground conductivity measurements.
Just saying. We in the electric industry use a high voltage megger to do
this.
Mine runs at approximately 500 volts DC.
This is used in commercial and industrial electrical work. I am also
required to Meg any ground connection at a residence to under 25 ohms.
Where I to bust out my Simpson meter, I'd lose my license.
Caught you stating you used a Simpson for ground resistance measurements
before. Forgot to correct ya on that one.
--Shane
KD6VXI
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