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Customizing and Updating the ATS
66 Smart Distribution Panel with ATS
Safety warnings
This Smart Distribution Panel with ATS is provided with an Emergency Power Off switch
connection. When this EPO switch is energized, electrical power to the units are de-engergized and
the system will not transfer to on-battery operation.
EPO can be achieved with either a contact closure or application of an external 24 VAC or 24 VDC
from a SELV or PELV source. It is important to note that hazardous voltage from the Mains must be
isolated from the contact closure or 24 VAC, or 24 VDC. The EPO circuit contact closure, the 24
VAC or the 24 VDC are 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.