Keith Lane, P.E., RCDD/NTS Specialist, LC, LEED AP, Director/VP Engineering, SASCO, Seattle

EPO or No—A Consideration of NEC Articles 645.10 and 685

Most people in the electrical design and construction industry are inclined to associate a data center or critical environment with an emergency power off (EPO). But what every designer doesn't know is that an EPO is not always required in a data center. Article 645 in the 2005 edition of the National Electrical Code discusses the requirements for information technology equipment.