MARTINDALE ET4000 Instruction Manual page 42

Martindale ET4000 / ET4500
Figure 5.22: Trip-out current measurement result example
Displayed results:
I ........... trip-out current
Uci ....... contact voltage at trip-out current I or the end value when the RCD does
not trip
t ........... trip-out time
Testing considerations
Parameters set in one function are also kept for other RCD functions.

The measurement of contact voltage does not normally trip an RCD. However,

the trip limit of the RCD may be exceeded as a result of leakage current flowing
to the PE protective conductor or a capacitive connection between the L and PE
conductors.
RCD trip-out time and RCD trip-out current measurements will only be performed

if the contact voltage in the pre-test at nominal differential current is lower than
the set contact voltage limit.
Ulim can be selected in the Uc sub-function only.

Selective (time-delayed) RCDs have delayed response characteristics. As the

contact voltage pre-test or other RCD tests influence time delayed RCD's it takes
some time to return to normal state. Therefore a time delay of 30 s is inserted
before performing a trip-out test by default.
42
Measurements