COMBITEST422
EN - 13
6. OPERATING INSTRUCTIONS
6.1. AUTO: AUTOMATIC TEST SEQUENCE (RA , RCD, M
)
This function allows performing the following measurements in an automatic sequence:
➢
Overall earth resistance without causing the RCD
’s tripping (
Ra
)
➢
Tripping current and tripping time of
General
RCDs type A (
), AC (
) or B (
)
➢
Insulation resistance with test voltages
50, 100, 250, 500, 1000
VDC
CAUTION
Some combinations of test parameters could be unavailable in compliance with
the technical specifications of the instrument and the RCD tables (see § 10.1
–
empty cells of RCD tables mean unavailable situations
)
CAUTION
Testing the RCD’s tripping time causes the RCD’s tripping.
Therefore, check
that there are NO users or loads connected downstream of the RCD
being tested which could be damaged by a system downtime.
Disconnect
all loads connected downstream of the RCD as they could produce leakage
currents further to those produced by the instrument, thus invalidating the
results of the test.
Fig. 4: Instrument connection through mains plug
Fig. 5: Instrument connection by means of single cables and remote switch probe
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