Step 5 measure the ground or leakage current if you wish to find out about the ground or leakage current all that you have to do is to set the rotary switch to ma or a.
Ground rod resistance check.
Check your clamp on tester s manual if it uses another kind of configuration.
The lower it is the better job it does.
You should measure the resistance of an electrode with respect to the surrounding soil in the area.
If your ground rods are placed at least one rod length apart you can use a formula to estimate the earth resistance of multiple grounding rods.
However we can estimate the resistance to ground using scenario b.
An ideal ground rod resistance should be below 3 ohms.
In some instances ground rods can be installed in areas where the earth has a lot of resistance.
The measurement of the loop resistance is relatively close to the resistance of the ground electrode being tested.
With this method the resistance of two electrodes in a series is measured by connecting the p1 and c1 terminals to the ground electrode under test.
To properly test the resistance of a ges you must follow some simple rules.
Ground ring ground rods.
Run the wire to your test location.
For a safe electrical system your ground rod resistance should have a very low resistance value.
You can only do this by using the fall of potential method with a three terminal earth ground resistance tester.
If there were 60 similar ground electrodes with a resistance of 10 ω each the measurement of the total loop resistance would be.
For instance if a ground rod is driven into a very rocky and dry area it may not conduct electricity into the ground well.
Ideally a ground should be zero ohms of resistance but.
Unfortunately as time goes by factors such as ground rod corrosion soil moisture high salt content high temperatures and loss of contact of your wires as well as others may increase the resistance of ground rod s hence affecting its effectiveness.
So if you are using 10 foot ground rods you must place.
In areas where driving ground rods may be impractical the two point method can be used.
R loop 10 ω 0 17 ω 10 17 ω.
P2 and c2 connect to a separate all metallic grounding point like a water pipe or building steel.
Multiple ground rods yield a lower resistance to ground than a single rod.
Step 1 connect your length of wire to a metal stake in the ground.
Unfortunately there is not one standard ground resistance threshold recognized by all certifying agencies.
For example the national electric code requires no greater than 25 ohms of resistance in a ground system.
