HT instruments SPEED418 - Manual (Page 26)

400 Series
EN - 25
6.4. RCD: TEST ON A-TYPE AND AC-TYPE RCDS
This function is performed in compliance with standard IEC/EN61557-6 and allows
measuring the tripping time and the current of the system’s RCDs. The following operating
modes are available:
 AUTO the instrument performs measurement automatically with a leakage current
equal to half, once or five times the set value of nominal current and with a
leakage current in phase with the positive and negative half-wave of the mains
voltage. Recommended mode for RDC test
 x½ the instrument performs measurement with a leakage current equal to half the
set value of nominal current
 x1 the instrument performs measurement with a leakage current equal to once the
set value of nominal current
 x2 the instrument performs measurement with a leakage current equal to twice the
set value of nominal current
 x5 the instrument performs measurement with a leakage current equal to five times
the set value of nominal current
 the instrument performs measurement with an increasing leakage current. This
test could be performed to determine the real tripping current of the RCD
 RA the instrument performs measurement with a leakage current equal to half the
set value of nominal current in order not to trip the RCD and measuring the
contact voltage and the total earth resistance.
CAUTION
Testing an RCD 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.
If possible, 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. 10: Instrument connection for 230V single-phase or double-phase RCD test through
shuko cable
Fig. 11: Instrument connection for 230V single-phase or double-phase RCD test by means
of single cables and remote probe