Measuring Rcd Tripping Time - Fluke 165X Installation Manual

165X
Users Manual

Measuring RCD Tripping Time

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Figure 15. RCD Tripping Time Display/Switch and
Terminal Settings
In this test, a calibrated fault current is induced into the
circuit, causing the RCD to trip. The meter measures and
displays the time required for the RCD to trip. You can
perform this test with test leads or using the mains cord.
The test is performed with a live circuit.
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When measuring trip time for any type RCD, the
tester first does a pretest to determine if the
actual test will cause a fault voltage exceeding
T
the limit (25 or 50 V). To avoid having an
inaccurate trip time for S type (time delay) RCDs,
a 30 second delay is activated between the
pretest and the actual test.
•
Test the connection between the N-
conductor and earth before starting the
apx008f.eps
test. A voltage between the N-conductor
and earth may influence the test.
•
Leakage currents in the circuit following
the residual current protection device
may influence measurements.
•
The displayed fault voltage relates to the
residual operating current of the RCD.
•
Potential fields of other earthing
installations may influence the
measurement.
Note
XW Warning