Residual current is an unintended flow of current to ground typically resulting from an issue with electrical insulation within a load or connecting wiring.
Residual current may be measured as:
The sum total of all currents flowing through the phase (and neutral) conductors
The current flowing through the Protective Earth (PE) conductor in TT and TN earthing systems
The RCM meter models can be used to continuously measure residual currents in an electrical system. The RCM meter models are equipped with two input channels (I5 and I6) that require specific toroid current sensors. Each RCM channel is capable of dual alarm configuration allowing a warning alert level and a higher level over alarm. The residual current measurements are processed once per second.
UNINTENDED OPERATION OR METER DAMAGE
Failure to follow these instructions can result in death, serious injury, or equipment damage.
Typical applications for meters with RCM capability include:
Leakage current measurement
Earth (Ground) current measurement
Automatic notification and/or digital output operation in event of leakage current alarm
Electrical installation reliability profiling