The lightning protection system plays an extremely important role. It protects the house or other building from lightning strikes and, consequently, fires, but also safely conducts energy to the ground via the shortest route possible. To increase work efficiency, but also to ensure the proper operation of the entire system, an earthing resistance meter should be used.
Check the grounding resistance meters at the Onninen wholesaler
What is ground resistance measurement?
Properly made grounding should have the lowest possible resistance value, but also the lowest possible resistance variation over a given time. It is important to know that grounding resistance measurement involves placing the current probe at an appropriate distance from the ground. Voltage probes should be placed halfway from the distance. It should be remembered that both the grounding electrode and the probes must be in a straight line. During the measurement, the voltage drop on the ground is measured. The grounding resistance measurement is therefore performed to check whether the electrical installation is working properly and meets the requirements for proper protection against electric shock. The resistance can be used to determine the value of the touch voltage.
This is what can occur between conductive parts located on the protective conductor. If no special guidelines have been specified, it is recommended that the resistance does not exceed 10 Ohms. The easiest way to measure resistance is with an ohmmeter, which determines electrical resistance. Its unit is Ohms. This device is used to determine not only the resistance of resistors, but also to measure electronic components and resistors. The resistance must be determined using a technical method, where the parallel connection of the voltmeter to the voltage source, as well as the voltage drop and current are taken into account.
What value should the grounding resistance be?
The earthing test is important and consists of discharging all electrical discharges to the ground. The measured resistance value should be as low as possible. It is best not to exceed 10 Ohms. At the same time, we can only speak of fully correct operation when the variability over time is also as low as possible. In single-family houses, this value should also not exceed 10 Ohms. In addition, in new houses, it is recommended to use additional RCD switches, as well as surge protection. Remember that the permissible error when measuring the earthing resistance cannot be more than 30%, and the measuring voltage at the meter terminals depends on the value of the measured insulation resistance RI. The value cannot be lower than the nominal voltage of the earthing resistance meter , but on condition that the measuring current does not exceed 1 mA.
Ground resistance meters at the Onninen wholesaler
When looking for high-class devices in the Onninen electrical wholesaler , you can choose the Sonel MRU-21 earth resistance meter . This is an extremely effective device that has a calibration certificate. It also has a built-in memory, which allows for quick and easy comparison of results. It also has an automatic discharge function, so this earth resistance meter is completely safe and easy to use.
It is also worth choosing the Sonel MRU-200 earth resistance meter . It uses all measurement methods, which really distinguishes it from the competition, so you can use both the technical method and the one using additional clamps. It also uses the impulse method. It has a function for measuring ground resistivity. Despite a number of functions, it is extremely accurate. It automatically calculates ground resistivity. The manufacturer has used a clamp calibration function, as well as measurement of interference voltages. This device works perfectly in difficult working conditions. You do not have to disconnect the control connectors.
The Fluke 1630-2 FC earth resistance meter is also worth noting. It is extremely precise in measurements, which allows for precise determination of the earth resistance value. For even greater convenience of work, it is equipped with an easy-to-use interface. The manufacturer has also implemented an automatic measurement range detection function. The counter resets to zero before each measurement. Thanks to this, you do not have to worry about errors. The housing is resistant to mechanical damage.
Check the grounding resistance meters at the Onninen wholesaler