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Megger LTW425 2 Wire Non-trip Loop Impedance Tester maxZ R1+R2 Downloadable

£610.80
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Megger LTW425 loop Tester
General Accuracy
All accuracy statements are based on:  
Ambient Temperature 23° ±2°C
Nominal Voltage Source 230V a.c ±1%
Voltage Measurements
(ac only) 50V to 440V
Accuracy ±2% ±1V
Frequency Measurements
Range  25Hz to 99.99Hz 
Accuracy ±0.1Hz
 A warning will be shown if applied voltage exceeds 440V.  
Damage will occur if applied voltage exceeds 600V rms
Loop Testing Accuracy
±5% ±0.03Ω @230V a.c
±10% ±0.02Ω  
±15%±0.03Ω @50V a.c.
No Trip Loop and High Current Loop Test
Source Voltage  50V to 440V (49Hz to 50.1Hz) 
Display Range 0.01 to 2000Ω
Accuracy ±5% ± 0.03Ω
No Trip Loop Test Nominal Current  15ma (at nominal 230V a.c supply) 
High Current Loop Test 4A (at nominal 230V a.c supply)
Operational Range 0.30 to 1000Ω
Prospective Fault Current (PFC)
Prospective Fault Current  =Measured Source Voltage/Loop Resistance 
Maximum Range No Trip Mode: 20KA
Accuracy is derived from loop test and voltage measurement
Safety

IEC 61010
Designed to IEC61010-1
Designed for 300 volts to Earth Category IV
with phase to phase voltages to 440V.
Fuse protected to 600 volts rms AC
EN61557

 Complies with the following parts of EN61577:  
Electrical Safety in Low Voltage Systems up to
1000V ac and 1500V dc - Equipment for testing,
measuring or monitoring of protective measures:
Part 1: General Requirements
Part 3 - Loop Resistance
E.M.C In accordance with IEC61326-1
Power Supply
Battery 8 x 1.5V Cells IEC LR6 Type (AA Alkaline)
Rechargeable 8 x 1.2V NiCd or NIMH Cells
Battery Life 2000 consecutive tests
Mechanical
Weight 1000g ±10% excluding test leads
Dimensions 203 x 148 x 78mm
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Description

Megger LTW425 Earth Loop Tester


The entry-level tester in Megger's earth loop tester range, the LTW425 is used for carrying out 2 wire loop impedance measurements on phase to earth or phase to neutral.

Guaranteed not to trip working RCDs of more than 30mA thanks to a non-trip loop test and compatible with both three and single phase systems, this tester makes performing measurements easier by requiring the use of only 2 test leads in order to carry out measurement procedures. When there is no risk of tripping an RCD it is also possible to use high current loop testing mode.

When carrying out no-trip testing procedures the LTW425 constantly evaluates the level of noise detected on circuitry to ensure that the accuracy of results is not modified by the presence of electrical noise.

The Megger LTW425 is part of the LTW range of earth loop testers. The following table outlines the difference between each of the available models in this series.

 

Megger LTW425 Comes Supplied With:

  • Megger LTW425 Earth Loop Tester
  • BS1363 to 3 x 4mm Socket Leadset
  • 2 Wire Leadset with Croc Clips
  • Shuko Plug Test Lead – EU-SC
  • AU/NZ Plug Test Lead – EU-AU
  • Hard Carry Case
  • User CD
 

Key Features:

  • 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
  • Resolution down to 0.01Ω
  • Portable lightweight instrument with tough carrying case encasing the tester
  • AUTO start function starts testing as soon as the leads are connected
  • PFC display up to 20kA
 

Megger LTW Series Selection Chart


 Function   LTW315   LTW325   LTW335   LTW425 
 2-Wire Non Tripping Loop Testing  X X X X
2-Wire Fast Test (High Current) X X X X
110V to 280V Applications X X X X
50V to 440V Applications   X X X
Phase to Phase Testing   X X X
20KA PFC Range X X X X
40KA PFC Range       X
0.01Ω Resolution X X X X
0.001Ω Resolution       X
AUTO Noise Detection X X X X
AUTO Start Loop Test X X X X
Voltage Measurements X X X X
Frequency Measurements X X X X
Max Zs Display   X X X
R2+R2 Display   X X X
Backlit Display (White Light) X X X X
Built-In Front Cover (Foldaway) X X X X
IP54 Weatherproof Case X X X X
Accepts Rechargeable Batteries X X X X
Test Result Storage     X  
Downloadable     X  

Features & Specification

More Information
Key Features Manufacturer Certificate Included, 2 wire non-tripping loop test, 0.001 ohm resolution, PSC/PFC, Non Trip Testing
Product Stock Status Next Day Delivery (subject to availability)
Manufacturer Megger
Short Description
Megger LTW425 loop Tester
General Accuracy
All accuracy statements are based on:  
Ambient Temperature 23° ±2°C
Nominal Voltage Source 230V a.c ±1%
Voltage Measurements
(ac only) 50V to 440V
Accuracy ±2% ±1V
Frequency Measurements
Range  25Hz to 99.99Hz 
Accuracy ±0.1Hz
 A warning will be shown if applied voltage exceeds 440V.  
Damage will occur if applied voltage exceeds 600V rms
Loop Testing Accuracy
±5% ±0.03Ω @230V a.c
±10% ±0.02Ω  
±15%±0.03Ω @50V a.c.
No Trip Loop and High Current Loop Test
Source Voltage  50V to 440V (49Hz to 50.1Hz) 
Display Range 0.01 to 2000Ω
Accuracy ±5% ± 0.03Ω
No Trip Loop Test Nominal Current  15ma (at nominal 230V a.c supply) 
High Current Loop Test 4A (at nominal 230V a.c supply)
Operational Range 0.30 to 1000Ω
Prospective Fault Current (PFC)
Prospective Fault Current  =Measured Source Voltage/Loop Resistance 
Maximum Range No Trip Mode: 20KA
Accuracy is derived from loop test and voltage measurement
Safety

IEC 61010
Designed to IEC61010-1
Designed for 300 volts to Earth Category IV
with phase to phase voltages to 440V.
Fuse protected to 600 volts rms AC
EN61557

 Complies with the following parts of EN61577:  
Electrical Safety in Low Voltage Systems up to
1000V ac and 1500V dc - Equipment for testing,
measuring or monitoring of protective measures:
Part 1: General Requirements
Part 3 - Loop Resistance
E.M.C In accordance with IEC61326-1
Power Supply
Battery 8 x 1.5V Cells IEC LR6 Type (AA Alkaline)
Rechargeable 8 x 1.2V NiCd or NIMH Cells
Battery Life 2000 consecutive tests
Mechanical
Weight 1000g ±10% excluding test leads
Dimensions 203 x 148 x 78mm

Delivery

Updated January 2024

Please note, our cut-off time is 2:00pm

Orders requiring calibration 

Whilst we take the greatest care to get all orders dispatched and delivered to you in the stated time frame, orders received PM and requiring calibration may on occasion miss dispatch that day, according to the complexity of the calibration.
Be assured they will ship on the next dispatch this in most cases should not add more than 24 hours to your delivery.

Bank/Public Holidays

Predicted delivery times are based on regular trading days Monday to Friday. Public holidays, bank holidays and weekends are outside the usual scope
of our dispatch and subject to activities/holidays of our carriers and therefore may incur additional days lead time to your order.

*UK Mainland (Revised March 2021)

Service Price
Standard FREE 2-3 Day Courier Delivery – UK Mainland only - Zones A & B - Order value OVER £75.00 ex VAT FREE
Standard FREE 2-3 Day Courier Delivery – UK Mainland only - Zones A & B - Order value UNDER £75.00 ex VAT £4.95
Next WORKING Day (excludes Saturdays, Sundays and public holidays)  – UK Mainland only - Zones A & B  - ANY order value - Order by 2:00pm £7.75
Saturday ANYTIME Delivery - Order by 2:00pm £9.95
 

 

 

 

 

Delivery Surcharges

Because of the high cost of carriage, we regretfully need to apply a surcharge on all deliveries made in the following regions:

  • Zones A & B  - Mainland delivery rates apply. 
  • Zone C - Scottish Highlands (Charges are calculated at the checkout).
  • Zone D - Outer Hebrides, Orkney Isles, Shetland Isles, Isle of Man, Scilly Isles, and Channel Islands (Charges are calculated at the checkout).
  • Zone E - Northern Ireland (Charges are calculated at the checkout).
  • Zone F - Republic of Ireland (Charges are calculated at the checkout).

Offshore Services

All offshore deliveries are a 3-4 day service as standard. This includes Channel Islands, Northern & Southern Ireland, Scottish Islands, Isle of Man and the Scilly Isles.

International delivery

International delivery charges are automatically added to your order at the checkout. For any questions regarding international deliveries please contact us at sales@isswww.co.uk

Export 

All export inquiries should be directed to the export division before placement of order.

If no shipping option is available to your selected country please call us FREE on 0800 0224 060 to discuss your requirements.
All stated prices are subject to VAT at the current rate where applicable.
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