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Understanding EPO and Its Downtime Risks


An Emergency Power Off (EPO) system is intended to power down a single piece of electronic equipment or an entire installation from a single point by activating a push button. EPO is employed in many applications such as industrial processes and information technology (IT). This white paper describes the advantages and disadvantages of EPO for protecting data centers and small IT equipment rooms containing UPS systems. Various codes and standards that require EPO are discussed. Recommended practices are suggested for the use of EPO with UPS systems.


Ashok Kulkarni Chief Engineer of the Ancillary Equipment Group, APC Ashok Kulkarni is Chief Engineer of the Ancillary Equipment Group at APC. He has 20 years experience in the field of power electronics, motor drives and UPS systems. He was with Thyssen Krupp Elevator research and development for 11 years designing advanced elevator controllers and motor drive systems. He has been designing ancillary components for Symmetra MW, InfraStruXure and Silcon product lines at APC for the last 4 years.
Stephen McCluer Senior Applications Engineer for External Codes and Standards Compliance, APC Stephen McCluer is a Senior Applications Engineer for external codes and standards compliance at APC. He has 25 years of experience in the power protections industry, and is a member of the IEEE Stationary Battery Committee where he chairs two working groups. He also is a member of NFPA, ICC, IAEI, ASHRAE, and the USGBC. He is a frequent speaker at industry conferences, and has authored technical paper and articles on power quality topics.
Schneider Electric
10 Jul 2009
01 Jan 2005
15 Page(s)
White Paper

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