This document addresses the physical security of data centres based upon the criteria and classifications for availability , security and energy efficiency enablement within EN 50600-1. This document provides designations for the data centres spaces defined in EN 50600-1. This document specifies requirements and recommendations for those data centre spaces, and the systems employed within those spaces, in relation to protection against: a) unauthorized access addressing organizational and technological solutions; b) intrusion; c) fire events igniting within data centres spaces; d) other events within or outside the data centre spaces, which would affect the defined level of protection. NOTE Constructional requirements and recommendations are provided by reference to EN 50600-2-1. Safety and electromagnetic compatibility (EMC) requirements are outside the scope of this document and are covered by other standards and regulations. However, the information given in this document can be of assistance in meeting these standards and regulations.