Have you noticed a thick wire which comes out from the electric mains
box and makes its way into the earth? Well, that is known as the earth wire. In
the event of lightning strike or voltage fluctuations, excess current flows
into the earth, thus saving your electrical appliances and fittings from
getting damaged. To ensure that the connection to the ground is safe and
reliable, electricians carry out a test with the help of digital earth
resistance testers.
Applications
of Earth Resistance Testers
The earth’s resistivity is not only measured when your mains connection
is installed but also, it is used for locating ore sources, clays and gravel
beneath the earth’s surface. The measurement is also done to determine the
distance to the bedrock and the thickness of glacial drift. Earth resistance
testers are also used to calculate the degree of corrosion in underground
pipelines carrying water, oil and gas.
Ground
Resistance Meters
Like earth resistance testers, ground resistance meters are used in many
applications and offer a range of options to customize it for an application.
The ground resistance meters are available in two options. The first one
is a traditional one which has stakes that are inserted into the ground. The
stakes are attached to the main unit through leads. The current is passed
through one of the stakes. When the other stake receives the current, the
current is measured and the voltage generated is compared. The instrument then
displays the system’s resistance.
The other is the Clamp on Ground Resistance Tester with Leakage Current. This device allows spot measurements without
the need of shoving stakes into the ground.
Things to consider before purchasing
a ground resistance meter
Before you buy a ground resistance meter, decide
the test in which you will use the device. Determine whether you need
accessories like stakes for the test. Also, check the measurement range. You
can buy digital earth resistance testers and clamp on ground resistance metres
online at low prices.
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