PRODUCT OVERVIEW

Overview of the LTW300 Series

The Megger LTW300 Series comprises two‑wire non‑tripping loop impedance testers designed to measure earth loop impedance on live circuits without disconnecting supply. These testers operate across a wide voltage range and are engineered specifically to avoid tripping standard 30 mA RCD protection during testing operations.

Testing Method and Application

These instruments employ a two‑wire testing method, enabling automatic start and loop impedance measurement while the circuit remains energized. They are suitable for use on both single‑phase and three‑phase systems with RCD protection, ensuring electricians can verify safety and compliance without interrupting service.

Performance Characteristics

All LTW300 testers deliver a high resolution of 0.01 Ω, adequate for accurate loop impedance determination. A built‑in noise detection circuit enhances reliability by monitoring supply noise that could potentially affect measurement results, with the loop test extending slightly if noise is detected.

Safety and Standards Compliance

Rated for CAT IV installation testing, the LTW300 Series aligns with industry safety levels for electrical installation testing. Loop tests typically run around 10 seconds, with additional time when noise interference is identified, supporting reliable diagnostics in diverse environments.