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Order Number: LTW425-EU-BS

Megger LTW425 Loop Impedance Tester

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  • Advanced loop impedance tester for fast and accurate electrical installation testing
  • Designed for professional engineering, inspection and maintenance workflows
  • Supports no-trip and high-resolution loop testing in demanding field conditions
  • Suitable for commercial, industrial and project-based verification tasks
  • Available on uazon.ae through an authorized distribiutor retail hybrid channel
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Description

About this model

Megger LTW425 Loop Impedance Tester Overview

The Megger LTW425 Loop Impedance Tester is a top-tier instrument engineered for professional electricians, commissioning engineers, and maintenance technicians who demand precision and efficiency. Designed to verify loop impedance on low-voltage circuits with uncompromising accuracy, this device ensures that circuit protection devices such as fuses, MCBs, and RCDs operate correctly in compliance with BS 7671 wiring regulations. When you are looking to buy a reliable loop tester, the Megger LTW425 stands out as a robust solution built for safety and speed.

Equipped with advanced measurement technology, the Megger LTW425 delivers fast, repeatable, and highly accurate results, even in electrically noisy environments. It supports both high- and low-current testing modes, enabling safe loop testing without tripping RCDs, which makes it ideal for modern installations and sensitive circuits. If you are comparing the Megger LTW425 price, consider the value of its dual-mode testing capabilities that protect sensitive equipment while ensuring regulatory compliance.

Technical Features and Field Applications of the Megger LTW425

This section explores the technical specifications and practical applications of the Megger LTW425, focusing on how its features translate to real-world benefits on the job site. Understanding these applications is essential for professionals seeking the best price-to-performance ratio in loop impedance testing equipment.

The instrument features a large backlit display with clear digital readouts and an intuitive user interface, making it easy to read results even in poorly lit environments. When you buy the Megger LTW425, you gain access to automatic and manual test modes, simple test lead connections, and a straightforward menu system that improve efficiency and reduce downtime. These design choices ensure that the Megger LTW425 price reflects not just hardware, but enhanced productivity.

  • High-speed loop impedance testing with exceptional accuracy for rapid diagnostics.
  • Supports high-current and non-trip low-current test modes for versatile applications.
  • Large backlit display for easy reading in all lighting conditions on site.
  • Automatic and manual test modes for maximum flexibility during inspections.
  • Rugged, compact design built for demanding site conditions and durability.
  • Long battery life for extended field use without frequent recharging.
  • Compliant with BS 7671 and IEC testing requirements for regulatory adherence.

Design and Durability for Demanding Environments

The Megger LTW425 is built to withstand the rigors of fieldwork, featuring a rugged, ergonomic design with superior drop protection and IP-rated casing for resistance against dust and moisture. This durability ensures that the device remains reliable in harsh conditions, making it a smart investment when evaluating the Megger LTW425 price against cheaper, less resilient alternatives.

Its compact, lightweight build ensures easy portability between job sites, while its long battery life supports extended use during busy workdays. Professionals who buy the Megger LTW425 appreciate that it combines portability with professional-grade performance, eliminating the need for multiple devices and streamlining workflow on complex projects.

Safety and Compliance in Loop Impedance Testing

Safety is paramount in electrical testing, and the Megger LTW425 addresses this with features designed to protect both the user and the equipment. The device is suitable for CAT-rated installations to BS 7671, ensuring that it meets the highest safety standards for low-voltage circuit verification.

By supporting non-trip low-current test modes, the Megger LTW425 allows for safe testing on live circuits without disrupting RCDs, which is critical for maintaining operational continuity in commercial and industrial settings. When you buy this tester, you are investing in a tool that prioritizes safety without sacrificing accuracy, making the Megger LTW425 price a value-driven choice for compliance-focused professionals.

Operational Efficiency and User Experience

The Megger LTW425 is designed with user efficiency in mind, featuring an intuitive interface that minimizes the learning curve for new users while providing advanced capabilities for seasoned technicians. The large backlit display ensures readability in low-light conditions, and the automatic sequencing of tests reduces manual input, allowing for faster completion of inspections.

For those comparing the Megger LTW425 price, consider how these efficiency features translate to time savings on the job. The straightforward menu system and simple test lead connections reduce setup time, enabling electricians to focus on diagnostics rather than configuration. 

Specification

Accuracy Basis

Condition Specification
Ambient temperature 23 °C ± 2 °C
Nominal source voltage 230 V AC ± 1%

Voltage Measurement (AC only)

Range Accuracy
50 V to 440 V ±2% ±1 V

Frequency Measurement

Range Accuracy
25 Hz to 99.99 Hz ±0.1 Hz

Warning: Indication shown if applied voltage > 440 V.
Damage threshold: Applied voltage > 600 V rms may cause damage.

Loop Testing – Accuracy (by model & supply)

Model Supply Accuracy
LTW315 100 V AC & 280 V AC ±10% ±0.03 Ω
LTW325 / LTW335 100 V AC & 300 V AC ±10% ±0.03 Ω
LTW425 ±10% ±0.02 Ω
LTW325 / LTW335 50 V AC ±15% ±0.03 Ω
LTW425 50 V AC ±15% ±0.03 Ω
All (ref at 230 V AC) 230 V AC ±5% ±0.03 Ω

NO-TRIP Loop & High-Current Loop Tests

Parameter LTW315 LTW325 / LTW335 / LTW425
Source voltage 100 V to 280 V (49–50.1 Hz) 50 V to 440 V (49–50.1 Hz)
Display range 0.01 Ω to 2000 Ω
Accuracy ±5% ±0.03 Ω
Nominal test current (No-Trip) ≈ 15 mA @ 230 V AC
Nominal test current (High current) ≈ 4 A @ 230 V AC
EN61557 operational range 0.30 Ω to 1000 Ω

High-Resolution Loop Test (LTW425 only)

Display range 0.001 Ω to 2000 Ω
Accuracy ±5% ±0.01 Ω
Nominal test current ≈ 4 A @ 230 V AC
EN61557 operational range 0.30 Ω to 1000 Ω

Prospective Fault Current (PFC)

PFC = Measured Source Voltage / Loop Resistance

Mode Maximum Range
No-Trip mode 20 kA
High-current mode 20 kA
High-resolution mode 40 kA
Accuracy derived from loop test and voltage measurement.

Environmental

Parameter Value
Operating temperature -10 °C to +50 °C
Operating humidity 90% RH non-condensing at +40 °C max
Storage temperature -25 °C to +70 °C
Max altitude (safety) 2000 m
Ingress protection IP54

Safety

Measurement Category Designed for 300 V to Earth Category IV; phase-to-phase up to 440 V
Protection Fuse protected to 600 V rms AC

EN61557 Compliance

Part 3 Loop resistance

EMC

Power Supply

Type Specification
Battery (alkaline) 8 × 1.5 V cells, IEC LR6 (AA)
Rechargeable 8 × 1.2 V NiCd or NiMH cells
Battery life Up to 2000 consecutive tests

Mechanical

Parameter Value
Weight 1000 g ±10% (excluding test leads)
Dimensions (W × H × D) 148 × 203 × 78 mm
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FAQs & How To

FAQs

It is used to measure loop impedance in electrical installations to support safety verification, fault analysis and compliance testing.
Yes, it is well suited for commercial buildings, industrial facilities and project-based electrical testing tasks.
Yes, you can order it on uazon.ae through an authorized distribiutor with a retail hybrid purchasing model.
Professionals choose it for dependable performance, trusted Megger build quality and suitability for engineering and service workflows.
Yes, it is a strong option for identifying loop-related issues during inspection, maintenance and fault-finding work.
Yes, it is suitable for project commissioning, periodic inspection and ongoing maintenance programs.

How To

Basic steps to perform a loop impedance test using the Megger LTW425 Loop Impedance Tester safely and accurately.

Estimated Time: PT10M

Insert the batteries, check the test leads and verify the Megger LTW425 Loop Impedance Tester is ready for operation according to the safety instructions.
Connect the test leads of the Megger LTW425 Loop Impedance Tester to the appropriate phase, neutral and earth points of the electrical installation.
Choose the appropriate loop impedance test mode such as no-trip or high current depending on the installation requirements.
Initiate the measurement and allow the Megger LTW425 Loop Impedance Tester to calculate the loop impedance value.
Review the displayed measurement and document the loop impedance reading for inspection, service or engineering project records.
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