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Loop Testers

Loop Testers

We supply Ze and Zs loop testers and loop impedance testers from Megger, Kewtech and Socket & See designed to check prospective earth fault current and short circuit current. Our range includes 2 wire non-tripping and high current models as well as combined loop impedance and RCD testers. The earth-fault loop measurement includes the resistance of phase and protective conductors within the installation, the highest values will occur at points furthest from the incoming supply position. A measurement within the installation will give the complete earth-fault loop impedance for the point at which it is taken (Zs), or the earth-fault loop impedance external to the installation (Ze) may be measured at the supply position.
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  1. Kewtech
  2. Martindale
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  5. Socket and See
  1. RCD Tester Combined
  2. No-Trip Loop Test
  3. 2 Wire No-Trip Loop Test
  4. Line to Line Test
  5. Downloadable

About Loop Testers

The ‘earth fault loop’ refers to the overall fault path for electrical current to flow in the event of an electrical fault. In general terms, the lower the fault loop impedance, the greater the amount of current will flow in the event of an electrical fault. This may sound horrific, however the large amount of fault current will enable a protective device to operate quickly in order to isolate the fault and stop the flow of current.

Measuring the earth loop impedance of an installation is important for maintaining both the efficiency of an electrical installation under prospective fault conditions, but also for reducing the risk of electrical shocks and fires taking place due to a defective means of earth. The majority of loop testers will also display a Prospective Fault Current (PFC) or Prospective Short Circuit Current (PSCC) value based upon the loop test impedance result.

It is important for a contractor to have the correct test equipment in order to carry out a loop impedance test to certify that an electrical installation is safe for use and not a potentially life threatening installation.

In very simple terms, a loop tester operates on the principle of Ohm’s law. By varying the amount of resistance placed across the line and CPC conductor within an electrical installation, a fault current will naturally circulate within the loop. The instrument will then calculate an impedance value by dividing the fault current by the supply voltage.

Test-meter.co.uk offer a variety of loop testers in stock. From standard loop testers, to models that offer a low current anti-trip test, you can be sure that we can cater for your loop testing application.