4.3 INTERPOSING CURRENT SENSORS
Refer to the glossary of terms to determine if an interposing current sensor is required for the application.
The mGARD-100 will work with I-Gard TxA and Rx-yA type zero sequence current sensors. Contact I-Gard for
the catalogue number of the zero sequence current sensor with the correct opening diameter required for the
application in case it is not shown on the table below or refer to the manual C-700 available at www.i-gard.com.
Refer to Figure 4.1, pass the phase and neutral conductors through the window of the interposing zero sequence
current sensor. Note that the relay is located downstream from the neutral ground point.
Position the cable in the centre of the zero sequence current sensor window opening. Keep cables and bus-work
clear of the split on split core zero sequence current sensors (T3A-S and T6A-S).
The two secondary terminals of the external zscs are to be routed through the window of the mGARD-100. If using
an mGARD-SYM, use the display to select the interposing I-Gard sensor that you are using to properly display
current levels.
Figure 4.1: mGARD-100 wired for external current sensor, failsafe operating mode, auto-reset with mGARD-SYM
