Raritan PX3-4000 series, User Manual

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571
PX models with residual current monitoring (RCM) detect and report
residual current - abnormal flow of current into the protective earth
conductor.
Residual current is a safety issue since electrocution is possible if the
rack or any device within it is touched.
Warning: PX RCM cannot disconnect power to stop residual current
flow. Devices like RCD and GFI disconnect power when residual
current is detected, but the PX with RCM are NOT RCD or GFI
protected devices.
In This Chapter
RCM Current Sensor .............................................................................571
RCM State Sensor.................................................................................572
Compliance with IEC 62020 ..................................................................573
RCM Self-Test .......................................................................................574
Web Interface Operations for RCM .......................................................574
Front Panel Operations for RCM...........................................................577
RCM SNMP Operations ........................................................................583
CLI Operations for RCM........................................................................584
RCM Current Sensor
The RCM current sensor detects current imbalance which indicates
current is flowing to ground. The sensor cannot determine the exact
location. It just reports the sum of all residual current in the PDU and
devices plugged into it.
Most equipment leaks a small amount of current and the UL/IEC 60950-1
standard for IT equipment permits up to 3mA. The RCM reports the
sum so if twenty plugged-in devices - each leaking 1mA, the RCM
sensor reports 20mA.
Appendix G PX Models with Residual Current
Monitoring