Megger LTW315-2 Wire Non-tripping Loop Impedance Testers


  • 2-wire loop testing procedures on phase to earth and phase to neutral
  • Guaranteed to not trip out RCDs thanks to non-trip loop testing
  • Noise detection filters out electrical noise that can create erratic readings
(1 customer review)
SKU: 3550

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Megger LTW315-2 Wire Non-tripping Loop Impedance Testers

The Megger LTW315 Loop Impedance Tester represents a significant advancement in electrical testing technology, designed specifically to cater to the needs of modern electrical contractors. This innovative tester is part of the LTW300 series and is engineered to ensure accurate, efficient, and non-tripping loop impedance testing using only two wires. The LTW315 is an ideal tool for verifying the loop impedance of live electrical circuits without the necessity of disconnecting the power supply, making it a crucial time-saver in various testing scenarios.

Megger LTW315-2 features:

One of the standout features of the LTW315 is its ability to perform dependable two-wire testing, even in situations where the neutral conductor is missing or difficult to access. This capability is particularly beneficial for testing in complex environments such as light switches and systems utilizing 110V center-tapped supplies. The tester is equipped to handle all supplies ranging from 110V to 280V AC and is carefully designed to avoid tripping 30mA RCDs during testing.

Utilizing cutting-edge digital processing techniques, the Megger LTW315 distinguishes the test signal from the fundamental frequency of the supply. This sophisticated approach allows the device to automatically average numerous test results over the test duration. As a result, it facilitates non-trip testing without the need for DC injection, enhancing both the safety and efficiency of the testing process. Additionally, the LTW315 includes a Prospective Fault Current (PFC) calculation feature, which is a standard offering across all Megger Loop Testers.

The LTW315 Loop Impedance Tester is not only effective but also user-friendly. It is constructed to withstand the rigors of regular use in a professional environment, demonstrating both durability and ease of operation. Developed after extensive customer research, the LTW315 meets the specific demands of electrical contractors who require reliable, precise tools that can keep pace with the competitive and challenging conditions of today’s market.


  • Two wire loop impedance measurement.
  • Guaranteed not to trip working RCDs of up to 30mA.
  • Three phase circuits with RCD protection can also be tested.
  • Test runs for approx. 10 secs.
  • Sophisticated noise detection circuitry that monitors supply to ensure accuracy.
  • Additional 10 secs is required if electrical noise is detected that could affect results.
  • High current test used for supplies with no RCD.
  • Auto-start function will start loop test running as soon as leads are connected.
  • Operates on a wide range of voltages: 110V to 280V.
  • Enables testing on 110V centre tapped supplies.
  • Frequency measurement.
  • PFC calculation up to 20KA.
  • Test results are displayed to a resolution of 0.01Ω.
  • Backlit display.
  • Three-phase safe and Category IV 300V rated.
1 review

1 review for Megger LTW315-2 Wire Non-tripping Loop Impedance Testers

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  1. Carolyn

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Megger since 1889 is a leading global premium manufacturer of measurement and testing technology. Megger top priority has always been to make your everyday work easier and safer. As such, insulation testers, micro-ohmmeters, and multimeters are among the long line of Megger inventions, making this brand one of the pioneers in the electrical industry. Megger products combine many years of experience and the valued feedback from our global users with the inventiveness and conscientiousness of our product developers. In Germany, we manufacture at three sites, Aachen, and Baunach near Bamberg and Radeburg near Dresden. Other manufacturing locations are based in Sweden, England, and America.


Data Sheet

Data Sheet


Two-Wire Loop Impedance Tester Specifications

Feature Description
Measurement Type Two wire loop impedance measurement
RCD Trip Safety Guaranteed not to trip working RCDs of up to 30mA
Three Phase Testing Can test three-phase circuits with RCD protection
Test Duration Approximately 10 seconds, additional 10 seconds for noise detection
Noise Detection Sophisticated circuitry monitors supply to ensure accuracy of the measurement
High Current Test Used for supplies without RCD
Auto-start Function Loop test starts as soon as leads are connected
Voltage Range Operates on 110V to 280V; suitable for testing on 110V centre tapped supplies
Frequency Measurement Capability to measure frequency
PFC Calculation Calculates prospective fault current up to 20KA
Display Resolution Test results are displayed to a resolution of 0.01Ω
Display Type Backlit display for clear visibility in various lighting conditions
Safety Rating Three-phase safe and Category IV 300V rated