User Manual Q&AAnswer
Feb 21, 2025 - 01:24 AM
To perform a loop impedance test using the Megger LTW300 2 Wire Loop Impedance Tester, follow these steps:
1. Connect the test leads to the appropriate terminals on the tester. The tester can be used for phase to earth, phase to neutral, or phase to phase testing.
2. Ensure that the electrical circuit you are testing is live and the power supply is not disconnected.
3. Press the power button to turn on the tester. The tester will automatically start the loop test as soon as the test leads are connected.
4. The tester will display the loop impedance measurement on the screen with a resolution of 0.01 Ω.
5. The LTW300 series testers are designed not to trip working RCDs of ≥30 mA during the test. However, if electrical noise is detected on the supply, the test may be extended by an additional 10 seconds to improve accuracy.
6. The LTW425 model offers a high current high resolution loop test to three decimal places. This is useful for establishing the correct Ze on an incoming supply, especially on PME installations.
7. The tester can also calculate the Prospective Fault Current (PFC) based on the measured loop impedance and the measured line voltage. The PFC can be displayed on the screen.
Please refer to the Megger LTW300 2 Wire Loop Impedance Testers Instruction Manual for more detailed instructions and safety precautions.
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