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Megger LTW315 Earth Loop Tester

Megger LTW315 Earth Loop Tester
sku: MEGLTW315
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  • 2 wire non-tripping loop test
  • 50 V to 440 V operation
  • 110 V centre-tap loop testing

£369.00 £442.80 (Inc. VAT)
RRP: £535.00
£369.00 £442.80 (Inc. VAT)
RRP: £535.00
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Megger LTW315 Earth Loop Tester Details

The entry-level tester in Megger's earth loop tester range, the LTW315 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 LTW315 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 LTW315 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.

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

Megger LTW315 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

What's Included?

  • Megger LTW315 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
Technical Specs

Megger LTW315 Technical Specifications

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% ±0.03Ω @100V a.c and 280V
No Trip Loop and High Current Loop Test
Source Voltage  100V to 280V (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

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


 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
Weight 1000g ±10% excluding test leads
Dimensions 203 x 148 x 78mm

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