Manual
GSC53N - GSC57 - ZG47
EN - 26
6.3. RCD: TEST ON "A" AND "AC" RCDS TYPE
WARNING
The automatic check of the RCD features causes the tripping of the RCD itself.
Therefore check that all devices connected downstream the RCD under
test are not damaged by power off. Possibly disconnect all the loads
connected downstream the RCD as they could add additional leakage currents
to the instrument ones and so making the test results void.
Turn the switch on RCD position:
The F1 key permits to select one of the following measuring mode (which can
be shown cyclically when pressing the key):
Mode "AUTO" (the instrument effects the test automatically with a
leakage current equal to half, once and five times the value of the rated
current set). Recommended test.
Mode "x ½" (the instrument effects the test with a leakage current equal
to half the value of the rated current set).
Mode "x 1" (the instrument effects the test with a leakage current equal
to once the value of the rated current set ).
Mode "x 2" (the instrument effects the test with a leakage current equal
to twice the value of the rated current set).
Mode "x 5" (the instrument effects the test with a leakage current equal
to five times the value of the rated current)
Mode " " (the instrument effects the test with a ramp growing leakage
current. Use this test to measure the tripping current).
Mode " R
A
" (the instrument effects the test with a leakage current
equal to half the value of the selected rated current and calculates the
contact voltage as well as the R
a
earth resistance).
N.B. The AUTO mode execute automatically test with phase 0° and 180°
RCD Type
0° Current Waveform
180° Current Waveform
AC type
A type
According to standard praxis it is recommended to effect RCD test both with
phase 0° and with phase 180° even with no AUTO modes. If the RCD under
test is A type (which means sensitive to both AC and unidirectional pulsing
leakage currents) it is advisable to effect the test both with sine wave and
unidirectional pulse current with phase 0° and 180°.