RCD Testing

Checking that RCCBs and ELCBs trip at the right current and time.

The problem

An RCD that does not trip, or trips too slowly, leaves people unprotected against shock. One that trips too easily causes nuisance outages.

Measurement required

Trip time at ½×, 1× and 5× rated residual current, ramp tests for actual trip current, and leakage current on the protected circuits.

Instrument type

A digital RCD tester for trip time, and a leakage clamp meter to find the source of standing leakage.

Relevant Kyoritsu instruments

Listed because their documented specifications cover this measurement. Check the full specifications for your exact requirement.

Trip-time tests on 10–500 mA RCDs, types AC and A (IEC 61557-6).

Locates leakage currents behind nuisance RCD trips (0.1 mA resolution).

How to choose

Check that the tester covers the RCD ratings and types (AC, A, selective) you use and suits your supply voltage.

Safety considerations

RCD tests are live tests. Warn users of the circuit, and make sure earth continuity has been verified first.

Other applications

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