HT instruments SPEED418 - Manual (Page 44)

400 Series
EN - 43
6.6. R
A
15MA: MEASUREMENT OF THE TOTAL EARTH RESISTANCE THROUGH
THE SOCKET-OUTLET
This function is performed in compliance with standards IEC/EN61557-6 and allows
measuring the impedance of the fault loop, comparable to the overall earth resistance in
TT systems. One single operating mode is available.
CAUTION
The measurement of the overall earth resistance involves the circulation of a
current between phase and earth according to the technical specifications of
the instrument (§ 12.1). This could cause the tripping of possible protections
at lower tripping currents.
Fig. 20: Instrument connection for 230V single-phase or double-phase P-PE fault loop
impedance measurement through shuko cable
Fig. 21: Instrument connection for 230V single-phase or double-phase P-PE fault loop
impedance measurement through single cables and remote probe
Fig. 22: Instrument connection for 400V + N + PE three-phase P-PE fault loop impedance
measurement through single cables and remote probe
Fig. 23: Instrument connection for 400V + PE (no N) three-phase P-PE fault loop
impedance measurement through single cables and remote probe