RCD tests
24
tester and check the wiring for a possible fault.
6
If the lamps are correctly lit, press the test button to apply half
the rated tripping current for 2000 ms, when the RCD should
not
trip. The PN and PE LEDs should remain on indicating the
RCD has not tripped.
7
Press the phase selector switch to indicate 180˚ in the display
and repeat the test.
8
In the event of the RCD tripping, the trip time will be displayed,
but the RCD maybe faulty.
9
Set the function switch to x1 for the ‘trip’ test, which measures
the time taken for the RCD to trip with the set residual current.
10
Press the phase selector switch to indicate 0˚ on the display.
11
Make sure that the P-E and P-N wiring check lamps are lit. If they
are not, disconnect the tester and check the wiring for a possible
fault.
12
If the lamps are lit, press the test button to apply full rated
tripping current and the RCD should trip, the tripping time being
shown on the display. If the RCD has tripped the PN and PE
LEDs should be off. Check this is so.
13
Press the phase selector switch to indicate 180˚ in the display
and repeat the test.
14
Make sure to keep clear of earthed metal during the
operation of these tests.
8.4 Testing RCDs used to provide supplementary protection. (x5 trip test)
RCDs rated at 30mA or less are sometimes used to provide extra
protection against electric shock. Such RCDs require a special test
procedure as follows:-
1
Set the function switch to x5 for the ‘fast’ trip test.
2
Press the phase selector switch to indicate 0˚ in the display.
3
Connect the test instrument to the RCD to be tested.
4
Make sure that the P-E and P-N wiring check lamps are lit. If they
are not, disconnect the tester and check the wiring for a possible
fault.
5
If the lamps are lit, press the test button to apply a test current
