Ground Rod Resistance Test

However we can estimate the resistance to ground using scenario b.

Ground rod resistance test.

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. In some instances ground rods can be installed in areas where the earth has a lot of resistance. So if you are using 10 foot ground rods you must place. For example the national electric code requires no greater than 25 ohms of resistance in a ground system.

Simultaneously perform a bonding test of the grounding conductor necessary to complete the return path. 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. Multiple ground rods yield a lower resistance to ground than a single rod. Browse our top selling 1623 2 geo earth ground resistance meter 1625 2 geo earth ground tester and the 1630 ground resistance meter today.

Ground ring ground rods. For a safe electrical system your ground rod resistance should have a very low resistance value. 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. Ideally a ground should be zero ohms of resistance but.

In areas where driving ground rods may be impractical the two point method can be used. For instance if a ground rod is driven into a very rocky and dry area it may not conduct electricity into the ground well. P2 and c2 connect to a separate all metallic grounding point like a water pipe or building steel. The lower it is the better job it does.

You can only do this by using the fall of potential method with a three terminal earth ground resistance tester. If this is the case for your ground rod the best solution is to drive a different rod into a different location. Check errant current flow to ground for operator safety and give an overview of ground system dynamics. To properly test the resistance of a ges you must follow some simple rules.

Run the wire to your test location. Built to withstand an entire spectrum of ground testing methods fluke s family of earth ground testers have been designed to be accurate safe and easy to use. Make sure that you have stripped back the insulation from both ends of the wire to allow for a good connection. You should measure the resistance of an electrode with respect to the surrounding soil in the area.

Check your clamp on tester s manual if it uses another kind of configuration. Test the resistance of a single rod in a series or array. 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.