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60kW InfraStruXure PDU—Operation and Configuration 3
Emergency Power Off (EPO)
This InfraStruXure PDU is provided with an Emergency Power Off switch connection. When this
EPO switch is energized, electrical power to the units is de-energized and the system will not transfer
to on-battery operation.
EPO can be achieved with either a contact closure or application of an external 24VAC or 24VDC
from a SELV or PELV source. It’s important to note that hazardous voltage from the Mains voltage
must be isolated from the contact closure or 24VAC, 24VDC. The EPO circuit contact closure, the
24VAC, or the 24VDC is considered a SELV circuit as defined in EN 60950 Safety of Information
Technology Equipment or PELV circuit as defined in IEC 60364-4-41 Electrical Installations of
Buildings, Protection for Safety—Protection Against Electric Shock. SELV is an abbreviation for
Safety Extra Low Voltage. PELV is an abbreviation for Protective Extra Low Voltage. SELV and
PELV circuits are isolated from the Mains through a safety isolating transformer, and are designed so
that under normal conditions the voltage is limited to 42.4 Vpeak or 60 VDC.
EMI
WARNING —This is a Class A product. In a domestic environment, this product may cause radio
interference, in which case, the user may be required to take adequate measures. This equipment has
been tested and found to comply with EN55022 (1998) and EN55024.