Summary
Residual current devices or RCDs protect against leakage currents and indirect contact. Testing them correctly confirms that they operate within expected conditions.
What is measured
Trip current, operating time and behavior according to device type and sensitivity are verified.
The test must be performed with a suitable instrument and considering the evaluated circuit.
Why time matters
An RCD may trip, but doing so too slowly or under incorrect conditions compromises protection.
Operating time is related to people safety and continuity of service.
Common errors
Using only the test button does not replace an instrumental measurement.
It is also common not to record sensitivity, circuit, equipment, polarity or system conditions.
Results report
The report must indicate the device tested, sensitivity, current, time, observations and recommendations.
If the RCD does not operate correctly, connection, load, existing leakage or replacement must be reviewed.
Frequently asked questions
Is the TEST button enough to validate an RCD?
No. It serves as a basic check, but it does not provide measured trip time or trip current.
When are RCDs tested?
During initial verification, maintenance, regularization or when there are abnormal trips.
Are all RCDs tested the same way?
No; it depends on type, sensitivity, application and circuit characteristics.
Can it be recorded in a RIC 19 report?
Yes, when it is part of the initial verification scope.
If you need technical support applied to this topic, review our initial verification RIC 19 service.