Earth loop impedance testers to verify the loop impedance of a live electrical circuit without the need to disconnect the electrical supply. The LTW300 series instruments offer a safe and easy 2 wire loop testing solution that does not trip 30mA RCDs and can be used on a wide range of voltages.

Backlit display
0.01Ω resolution
No-trip loop test on circuits with RCDs of ≥30 mA
3 phase circuits with RCD protection can be tested
Tests radial circuits where the circuit does not return to the origin, even where only a phase and neutral contacts are available.
10 second non trip loop test time with Auto test extension up to a further 10 seconds if noise is detected, to improve the accuracy of the test
High current loop testing for supplies that do not have an RCD fitted
AUTO START will start the loop test running as soon as the test leads are connected; no need to press the test button means much safer testing
PFC Display up to 20kA
Voltage and frequency measurement
110Vac systems including 110V centre tap to earth (55V phase to earth) can be tested on the secondary winding.
IP54 Weatherproof case
Optional 10A fused 2 wired test leads and crocodile clip set
Complies with IEC61010-1 300V CATIV safety standard and meets EN61557

RS is an authorised Megger distributor. Purchased though RS this product is eligible for the Megger extended 3 Year warranty

Test lead set with crocodile clips, mains socket test lead, 8 AA alkaline batteries, hard carry case and instructions.

For earth fault loop testing without shockwaves, turn to this electrical test and measurement accessory from Megger. It's a test lead set that's insulated to protect you against electric shocks, so you can safely check live electrical circuits. For ease of use, the kit comes with test probes and crocodile clips, so you've got everything you need to get up and running. This cable set is compatible with Megger's LTW300 range of non-tripping loop impedance testers, which are battery-operated and a cinch to transport.

• Suitable for use in demanding locations, thanks to a wide operating temperature range between -10°C and +50°C
• Compatible with single and three-phase electrical systems for versatility
• Colour-coded components offer quick and easy identification
• Testing automatically starts as soon as leads are connected for speedy results

• Electrical engineering
• Automotive manufacturing
• Aerospace industry
• Public infrastructure

Simply plug these leads into the rear of your Megger loop impedance tester. These sockets are clearly marked to minimise the chance of incorrect connection.