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 Maximum Voltage Measurement Best Loop Test Accuracy Resolution Non-Trip Loop Test Safety Category Battery Life Weight Maximum Operating Temperature Maximum Test Frequency Minimum Test Frequency Model Number p Plug Type Battery Type
RS Stock No. 198-435
Mfr. Part No.LTW315-EU-BS
2 Wire, 3 Wire 440V ±10% - Yes CAT IV 300 V, IEC 61010 2000 Tests 1kg +50°C - - LTW315 - AA
RS Stock No. 528-6681
Mfr. Part No.LT300-EN-BS
2 Wire 550V ±5% 0.1 Ω - CAT IV 300 V - 980g +60°C 400Hz 16Hz LT300 Type G - British 3-pin AA