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Megger LTW335 Loop Tester The Megger LTW335 Loop Tester gives you a fast and safe way to check earth loop impedance on live circuits. It suits regular site work well, and it helps you test without wasting time on manual notes. With two-wire testing, you can measure phase to earth, phase to neutral, and phase to phase with less setup. The built-in memory also stores results for later download, so records stay clear and easy to manage. Built for fast and safe testing Megger LTW335 Loop Tester supports non-trip loop testing for working 30 mA RCDs and above, which helps avoid unwanted trips during checks. When no RCD is fitted, you can also use the high current loop test for quick readings. Noise on site can affect loop readings, yet this unit helps reduce that risk with automatic noise detection. In addition, the auto-start function begins the loop test as soon as the leads are connected, which speeds up repeated work. Made for site use Because jobs vary, the Megger LTW335 Loop Tester works on supplies from 50 V to 440 V AC and is three-phase safe. It also supports 110 V centre tap to earth circuits, radial circuits, and phase to phase testing where needed. For daily use, the Megger LTW335 Loop Tester has a backlit display, an IP54 weatherproof case, and a foldaway front cover. It also accepts rechargeable batteries and comes with lead sets and a carry case, so you can get to work straight away.   Key Features Stores test results in built-in memory Allows downloading of saved results Performs two-wire loop impedance testing Supports non-trip testing on live circuits Includes a high current loop test mode Uses automatic noise detection during tests Starts tests automatically when leads connect Supports phase to earth measurements Supports phase to neutral measurements Supports phase to phase measurements Has a backlit display for clear viewing Uses an IP54 weatherproof case with front cover   Technical Specifications Manufacturer Megger Manufacturer part code LTW335 Product type Two-wire earth loop impedance tester General accuracy ±5% ±0.03 Ω Loop testing accuracy ±5% ±0.03 Ω at 230 V AC Display range 0.01 Ω to 2000 Ω Loop test operational range 0.30 Ω to 1000 Ω Loop test resolution 0.01 Ω Source voltage 50 V to 440 V AC at 49 Hz to 50.1 Hz Voltage measurement range 50 V to 440 V AC Nominal voltage source 230 V AC ±1% Frequency measurement range 25 Hz to 99.99 Hz No trip loop test nominal current 15 mA at nominal 230 V AC High current loop test 4 A at nominal 230 V AC Prospective fault current Up to 20 kA Measurement functions Loop impedance, voltage, frequency, Max Zs display and R1 R2 display Application range 110 V to 280 V applications and 50 V to 440 V applications Circuit compatibility Single phase and three phase supplies, radial circuits and 110 V centre tap to earth circuits Safety rating IEC61010-1 CAT IV 300 V Standards compliance EN61557, IEC61010, BS7671 and VDE 0413 part 1 and 4 Ingress protection IP54 Battery type 8 x 1.5 V AA LR6 alkaline or 8 x 1.2 V NiCd or NiMH Battery life Up to 2000 consecutive tests Dimensions 203 mm x 148 mm x 78 mm Weight 1000 g ±10% excluding test leads Calibration certificate Supplied at the time of manufacture Warranty 3 years   Comparison Table Feature LTW315 LTW325 LTW335 LTW425 2 wire non-tripping loop testing Yes Yes Yes Yes 2 wire fast test high current Yes Yes Yes Yes 110 V to 280 V applications Yes Yes Yes Yes 50 V to 440 V applications No Yes Yes Yes Phase to phase testing No Yes Yes Yes 20 kA PFC range Yes Yes Yes Yes 40 kA PFC range No No No Yes 0.01 Ω resolution Yes Yes Yes Yes 0.001 Ω resolution No No No Yes Auto noise detection No Yes Yes Yes Auto start loop test Yes Yes Yes Yes Voltage measurement Yes Yes Yes Yes Frequency measurement Yes Yes Yes Yes Max Zs display No Yes Yes Yes R1 R2 display No Yes Yes Yes Backlit display Yes Yes Yes Yes Built-in front cover Yes Yes Yes Yes IP54 weatherproof case Yes Yes Yes Yes Accepts rechargeable batteries Yes Yes Yes Yes Test result storage No No Yes No Downloading test results No No Yes No Test lead set with crocs Yes Yes Yes No Mains socket test lead Yes Yes Yes Yes Full calibration certificate Yes Yes Yes Yes IEC61010-1 300V CAT IV Yes Yes Yes Yes EN61557 Yes Yes Yes Yes   Document Downloads Megger LTW335 Loop Tester - Datasheet (Size: 283 KB)Megger: Loop Testing Techniques (Size: 62 KB)Megger LTW335 Loop Tester - User Manual (Size: 4 MB) What’s Included Megger LTW335 Loop Tester BS1363 to 3 x 4 mm socket leadset 2 wire leadset with crocodile clips Schuko plug test lead EU-SC AU/NZ plug test lead EU-AU Hard carry case User CD