Preferably, RCDs should be tested in the sequence of: x1 IΔn, x5 IΔn (if required for additional protection), followed by x0.5 IΔn and then finally the test button trip.
However, some automated test instruments test in the sequence of: x0.5 IΔn followed by the x1 IΔn test, and then x5 IΔn test (if required for additional protection).
In any case, the test button should be operated last in the sequence.
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