Seaward LLT Network Rail Approved Live Line Tester for Electrical Rail Systems

By Chris Dodds on 24th September, 2012

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Seaward LLT Network Rail Approved Live Line Tester for Electrical Rail Systems

Live Line Testers - Seaward LLT

Network Rail Approved 


Seaward LLT live line voltage indicators have been designed to ensure safe working on third-rail electrified railway lines and systems. The Seaward LLT and proving unit are approved by Network Rail - Certificate of Acceptance No. PA05/03345.

Seaward LLT Live Line Voltage Indicators

The new Seaward LLT two pole voltage detector enables service engineers, maintenance personnel and technical staff to verify that conductor rails have been isolated from the power supply before maintenance or inspection work commence on rail track systems.

The Seaward LLT unit has been designed specifically for the safe and practical detection of voltages on electrified rail systems above a threshold level of 300V DC up to a maximum of 1100V (11kV) DC.

Ultrabright red LEDs and a polarising filter built into the handle section of the live line tester make the voltage indication clearly visible in all working environments and conditions – even in bright sunlight.

Seaward LLT Live Line Tester Features

  • Designed and manufactured in compliance with international safety standard BS EN61243-3
  • The live line test unit is totally encapsulated in a shock resistant high impact rugged enclosure
  • IP65 rated
  • Equipped with PVC hand guards and high visibility cable
  • Special battery powered proving unit available for self-test proof of live line tester performance before and after use
  • Neon active indicator for simple and immediate on-site verification of tester functionality
  • A special carrying case for the Live Line Tester and LLT Proving Unit is also available


Seaward LLT Live Line Tester Specifications

Maximum Working Voltage

1100V DC

Threshold Voltage

200V AC / 300V DC

Operating Current

<10mA DC at Max Working Voltage


High Intensity LED with Polarising Filter

Handle Length


Overall Length


Handle Diameter


Probe Tip Length


Hand Guard Height

27mm Over Full Circumference

Distance From Uninsulated Probe Tip To Handguard


Uninsulated Contact Electrode Diameter


Contact Electrode Diameter


Lead Length Between Probes

1.7m Double Insulated Cable


High Impact, Total Encapsulation


BS EN 61243-3:1999 Voltage Class B

The introduction of the live line tester for railway service applications expands the Seaward range of voltage indicators and safety testing equipment that includes a comprehensive range of neon and digital high voltage indictors, safe discharge units, neon and digital phasing equipment, insulator leakage detectors and current clamps.

  • Further Reading


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Seaward LLT - Voltage Detectors Live Line Testers NR Safety Bulletin

Category:  Rail

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