Loop Impedance Testers

What is loop testing?
Loop testing is a quick, convenient and highly specific method of evaluating an electrical circuit for its ability to engage protective devices (circuit breakers, fuses, Ground-fault circuit interrupter).
There are 5 test methods:
• two-wire high-current
• two-wire no-trip with dc injection
• three-wire no-trip
• two-wire no-trip
• four-wire grid impedance testing

The main reason for earth loop impedance testing, is to verify that if a fault occurs in an electrical installation, sufficient current will flow to operate the fuse or circuit breaker protecting the faulty circuit within a predetermined time. The objective is to make sure that the circuit is disconnected fast enough to prevent overheating and possibly a fire.

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Description Price Loop Impedance Test Type Calibrated Maximum Voltage Measurement Best Loop Test Accuracy Resolution PSC Display Non-Trip Loop Test Safety Category Battery Type Battery Life Power Source Dimensions Weight Height
RS stock no. 198-435
Mfr. Part No.LTW315-EU-BS
R 11,316.60
2 Wire, 3 Wire - 440V ±10% - - Yes CAT IV 300 V, IEC 61010 AA 2000 Tests Battery 203 x 148 x 78mm 1kg 78mm
RS stock no. 528-6681
Mfr. Part No.LT300-EN-BS
R 10,543.80
2 Wire - 550V ±5% 0.1 Ω - - CAT IV 300 V AA - Battery 203 x 148 x 78mm 980g 78mm
RS stock no. 123-2239
R 3,106.27
3 Wire - - ±2% 0.01 Ω Yes - - - - Mains 180 x 130 x 70mm 800g 70mm