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400 Series

EN - 26

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

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HT 400 Series Specifications

General