User Manual
17
This test measures the RCD tripping current by applying a test current and then gradually
increasing the current until the RCD trips. You can use the test leads or mains cord for this
test. A 3 wire connection is required for testing of RCD type B.
WWarning
Note: If the L and N terminals are reversed, the tester will auto-swap them internally and
continue testing. If the tester is configured for UK operation, testing will halt and you will
need to determine why the L and N are swapped.
This condition is indicated by symbol (
).
Type A and type B RCDs do not have the 1000 mA option available.
1. Turn the rotary switch to the
position.
2. Press F1 to select the RCD current rating (10, 30, 100, 300, or 500 mA).
3. Press F2 to select the RCD test-current waveform:
– AC current to test type AC (standard AC RCD) and type A (pulse-DC sensitive RCD)
– Half-wave current to test type A (pulse-DC sensitive RCD)
– Delayed response to test S-type AC (time delayed AC RCD)
– Delayed response to S-type A (time delayed pulse-DC sensitive RCD)
– Smooth-DC current to test type B RCD
– Delayed response to S-type B (time delayed smooth-DC current RCD)
4. Press F4 to select the test current phase, 0° or 180°. RCDs should be tested with both
phase settings, as their response time can vary significantly depending on the phase.
Note: For RCD type B (
) or S-type B ( ), you must test with both phase
settings, all three test leads are required.
5. Press and release
. Wait for the test to complete.
•Theprimary(upper)displayshowsthetriptime.
RCD testing at locations with IT systems requires a special test procedure because the
Protective Earth connection is grounded locally and is not tied directly to the power system.
The test is conducted at the electrical panel using probes. Use the connection shown in
Figure 18 when performing RCD testing on IT electrical systems.