Megger LTW425 Loop Impedance Tester Description

The Megger LTW425 loop impedance tester is able to verify the loop impedance of a live electrical circuit. The device has a dual wire loop testing solution that does not trip 30 mA RCDs, and it is suitable for a wide range of voltages. It also offers a range of features to make earth loop testing safer and easier. We offer the Megger LTW425 loop impedance tester to rent for as little as £35 per week.

Features and Benefits

• 2 Wire Non-tripping loop tester
• 50 V to 440 V operation
• 110 V centre-tap loop testing
• CATIV installation testing
• AUTO start – operation
• 0.001 Ω resolution (LTW425)

Product Specs

NO-TRIP Loop and High current Loop test

• Source voltage: 50V to 440V (50Hz)
• Display range: 0.01 Ω to 2000 Ω
• Accuracy: ±5% ±0.03 Ω
• Nominal test current: No-Trip loop test: 15 mA (at nominal 230 V a.c supply), High current loop test: 4 A (at nominal 230 V a.c supply)
• EN61557
• Operational range: 0.30 Ω to 1000 Ω

High resolution loop test

• Source voltage: 50 V to 440 V (50Hz)
• Display range: 0.001 Ω to 2000 Ω
• Accuracy: ±5% ±0.01 Ω
• Nominal test current: 4 A at nominal 230 V supply
• EN61557
• Operational range: 0.30 Ω to 1000 Ω

Prospective Fault Current (PFC)

• Prospective fault current = Measured Source Voltage / Loop resistance
• Maximum range: No trip mode: 20 KA, High current mode: 20 KA, Hi resolution mode: 40 KA. Accuracy is derived from loop test and voltage measurement.
• Operating Range: -10°C to +50°C
• Operating Humidity: 90% R.H. non-condensing at +40°C max.
• Storage Range: -25°C to +70°C
• Maximum altitude: 2000m to full safety specification
• Dust and water ingress: IP54
• Safety: IEC61010, Designed to IEC61010-1, Designed for 300 volts to Earth Category IV, with Phase to Phase voltages to 440 Volts. Fuse protected to 600 volts rms ac.
• EN61557: Complies with the following parts of EN61557, Electrical safety in low voltage systems up to 1000V ac and 1500V dc- Equipment for testing, measuring or monitoring of protective measures: Part1-General Requirements, Part3-Loop resistance
• E.M.C: In accordance with IEC61326-1

Power supply

• Battery: 8 x 1,5 V cells IEC LR6 type (AA alkaline).
• Rechargeable: 8 x 1.2VNiCd or NiMH cells
• Battery life: 2000 consecutive tests