New to the data center? Let’s always clarify which standard we're using, the Uptime or TIA-942 (via EPI), because standards matter. 1) Uptime Institute – Tier System (I to IV) Focused mainly on infrastructure topology and availability. ✓Tier I – Basic setup, single path for power/cooling, no redundancy. ✓Tier II – Adds redundant capacity components (e.g., UPS, generators), but still a single path. ✓Tier III – Fully maintainable: systems can be maintained without shutting down operations. ✓Tier IV – Fault-tolerant: fully redundant, separate paths, auto failover, continuous cooling. 2) EPI / TIA-942 – Rated System (Rated-1 to Rated-4) Based on TIA-942 and includes not only Availability, but also Security, Safety, Cabling, Fire Protection, Physical Infrastructure, etc. ✓Rated-1 – Basic site infrastructure (similar to Tier I). ✓Rated-2 – Redundant components (like Tier II), limited scope. ✓Rated-3 – Concurrently maintainable infrastructure (like Tier III), but includes other domains too. ✓Rated-4 – Fault-tolerant design across all domains (not just power/cooling). Key Difference: ✓Uptime Tiers = Focus on Power & Cooling Topology ✓EPI/TIA-942 = Broader scope covering multiple disciplines (holistic approach) #dc #datacenter #datacentre #computer #construction #engineers #consultants #architects #projects #hpc #uptime #epi #tia