Balboa Water Group GL/GS 230V - Manual (Page 14)

14
230 Volt 50 Hz - Residual Current Devices (RCD’s)
Two Pole RCD
Four Pole RCD
A residual current device (RCD, or R.C.D. henceforth) is the
generic term for a device that monitors the current in the
line conductor and the neutral conductor of a circuit in an
earthed system.
In a circuit that’s operating properly, the vector sum of the
live and neutral current values added together will be zero.
Current flowing to earth, due to a line earth fault, will return
via the earth conductor, and regardless of load conditions,
will be registered as a fault. This current flow will give rise to
a residual current that will be detected by the device. If the
residual current exceeds the rated sensitivity of the RCD, it
will automatically activate a tripping of the faulty circuit.
Typical specifications are as follows:
Residual Current Devices ( RCD’s ) range
Sensitivity - from 10 to 500mA
Voltage - 2 poles : 230V; 3/4 poles: 230/400V
Connection capacity
- 25A: 6/10 mm² (flexible/ rigid cable)
- 40,60A: 16/25 mm²
- 80,100A: 35/50 mm²