Earth loop impedance test
The External Earth Loop impedance test sequence in an Electrical Installation is a live test so extra care is advised!
Step 1. Use an Earth Fault Loop Tester or option on a multifunctional tester such as the Megger 1553.
How do you reduce impedance?
You can reduce your input impedance by simply adding a parallel resistor to the ground. This approach is often taken to ensure a transmission line is terminated by a matching impedance. You can also reduce input impedance (to near zero) using feedback, such as in a trans-impedance amplifier.
What’s the difference between impedance and resistance?
Resistance is a concept used for DC (direct currents) whereas impedance is the AC (alternating current) equivalent. Resistance is due to electrons in a conductor colliding with the ionic lattice of the conductor meaning that electrical energy is converted into heat.
What causes high impedance?
The increased resistance may be caused by a variety of factors, including corrosion, loose connections, and damaged conductors, for example.
How to perform earth loop impedance test
In most cases, the circuit breaker needs to be bridged out. The total earth fault loop impedance is measured by plugging a loop tester into a socket outlet, or in some cases with an external earth probe. The value of the earth fault loop impedance is the sum of the resistances.
Why do you need earth fault loop testing?
Because of the severity of coming into contact with an electrical fault, having your electrical installations and power points tested for earth fault loop impedance is crucial. Your systems are valuable and circuitry needs to be maintained for the durability and functionality of your business.
This article was first published on The Knowledge Burrow.
Related article: Electrical Energy Safety For Home Owners
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