[Top] [All Lists]

[TowerTalk] Ground resistance measurements

To: <>
Subject: [TowerTalk] Ground resistance measurements
From: (
Date: Thu, 4 Jun 1998 20:49:34 EDT
In a message dated 98-06-04 20:26:16 EDT, writes:

<< First, the manual doesn't say how long the test electrodes should be (i.e.,
 how far into the ground they should be pounded.) Does anyone know? Can I use
 a couple of those short TV-type rods from Rad Shack for the electrodes, or
 do I need to use some 8' rods? Second, since all my ground wires are
 Cadwelded to the existing rods, I can't disconnect them. There's one rod
 attached to the tower where I could disconnect the lead at the tower base to
 isolate the rod, but that would be rather a chore.

      I'm sure that it depends on what the system is design around. Several of
the Megger ground resistance instruments use 20 inch probes.

     The ground resistance devices I've seen all use flexible copper wire for
their probes with some compression attachment method. That makes them easy to
work with. 

     Here's an interesting site that has the Megger devices and also a
library that has several interesting books on grounding as well as a pamphlet
on measuring ground resistances. - check it
     If you look at the Megger specs, you'll see some interesting information
about it. 

>> I'm wondering if any meaningful measurements can be obtained by taking
 readings on a ground rod that is connected to the rest of my grounding
 system. Anybody know? I'm guessing that the readings would be lower than for
 a single rod because the rods and radials would provide additional paths
 from the test electrodes to the rod under measurement. True? Would that
 number still be meaningful?
     Probably. I'd search the web for the manufacturer and then contact them
to get a manual. That'll probably answer all your questions. 

Cheers,   Steve  K7LXC

FAQ on WWW:     
Administrative requests:

<Prev in Thread] Current Thread [Next in Thread>