Raritan PX3-1000 series, User Manual

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589
PX3 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: PX3 RCM cannot disconnect power to stop residual current
flow. Devices like RCD and GFI disconnect power when residual
current is detected, but the PX3 with RCM are NOT RCD or GFI
protected devices.
In This Chapter
RCM Current Sensor ............................................................................... 588
RCM State Sensor ................................................................................... 589
Compliance with IEC 62020..................................................................... 590
RCM Self-Test ......................................................................................... 591
Web Interface Operations for RCM ......................................................... 591
Front Panel Operations for RCM............................................................. 594
RCM SNMP Operations ........................................................................... 597
CLI Operations for RCM .......................................................................... 598
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.
Raritan offers two types of RCM sensors.

Type A: Detects AC leakage and is sensitive down to 6mA leakage.
Models ending in -M5.

Type B: Detects AC and DC leakage and is sensitive down to 30mA.
Models ending in -M11.
Appendix F PX3 Models with Residual Current
Monitoring