Megger LTW315 Earth Loop Tester
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
Accessories
There are a number of accessories available for the Megger LTW315 Earth Loop Tester. For further information please contact our sales team.
| Our SKU | Megger Part Number | Product |
| MEGRCDA1 | 6231-601 | UK Mains Plug Test Leadset 3-pin 1 wire (BS1363 plug) |
| MEGLTA2 | 1001-883 | Test lead set 3-wire Red/Black/Green with prods/clips (exposed tip) |
| 1001-976 | 1003-132B | Test Lead Set Red/Green Unfused (Boxed) |
| 1000-562 | 1000-562 | Test Lead Replacement Probe Cap [Clear] Bag of 20 |
| 6220-810 | 1004-323B | SIA10 Socket Interface Adaptor UK to 3 Leads x 4mm (Boxed) |
| 1005-469 | 1005-469 | SIA10 Socket Interface Adaptor LTW |
| 1007-003 | 1007-003 | Blow Moulded Case Catch - Pack of 10 |
| 1007-167 | 1007-167 | Blow Moulded Case MIT/LT/RCDT 300 Series |
| Please note that the accessories listed above and the attached datasheets are subject to change. Both were correct at the time of publication. | ||
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 | |
| Safety |
IEC 61010 |
| EN61557 |
Complies with the following parts of EN61577: |
| 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 |
| SKU | MEGLTW315 |
|---|---|
| Manufacturer Part Code | LTW315-EU-BS |
| Model Ref | LTW315 |
| Country of Origin | United Kingdom |
