# Everything You Need to Know About Data Centers Knowledge Center Plain-language guides written for technicians, managers, and career changers. Learn how power, cooling, safety, security, and operations fit together, then go deeper with a course when you're ready. - [Start With Data Center 101](https://datacentertraining.us/learn/what-is-a-data-center.html) - [Open the Glossary](https://datacentertraining.us/learn/glossary.html) - **12 guides** free to read - **200+ terms** in the glossary - **8 quizzes** to test yourself New Here? ## A Reading Path for Beginners Read these in order and you will understand how a data center works from the utility feed to the server. 1. **[Data Center 101](https://datacentertraining.us/learn/what-is-a-data-center.html)**What a data center is, what's inside, and the main types. 2. **[Power](https://datacentertraining.us/learn/data-center-power.html)**Utility, generators, UPS, and distribution to the rack. 3. **[Cooling](https://datacentertraining.us/learn/data-center-cooling.html)**How heat is removed and why airflow matters. 4. **[Tier levels](https://datacentertraining.us/learn/data-center-tiers.html)**How redundancy turns into Tier I through IV. 5. **[Safety](https://datacentertraining.us/learn/data-center-safety.html)**The hazards and rules every technician must know. Systems ## How the Facility Works ### [Data Center 101](https://datacentertraining.us/learn/what-is-a-data-center.html) What a data center is, white space vs gray space, and colocation, hyperscale, enterprise, and edge facilities. Read the guide → ### [Power Systems](https://datacentertraining.us/learn/data-center-power.html) Switchgear, generators, transfer switches, UPS systems, PDUs, A/B feeds, and N+1 vs 2N redundancy. Read the guide → ### [Cooling Systems](https://datacentertraining.us/learn/data-center-cooling.html) CRAC vs CRAH, chilled water plants, economizers, containment, and liquid cooling. Read the guide → ### [CRAH Units](https://datacentertraining.us/learn/crah-units.html) Components, CRAH vs. CRAC, common failures, and maintenance. Read the guide → ### [Emergency Power Off (EPO)](https://datacentertraining.us/learn/data-center-epo.html) What an EPO does, NEC Article 645, and preventing accidental shutdowns. Read the guide → ### [Data Center BMS](https://datacentertraining.us/learn/data-center-bms.html) What a BMS controls, and BMS vs. BAS, EPMS, and DCIM. Read the guide → ### [Tier Levels & Redundancy](https://datacentertraining.us/learn/data-center-tiers.html) Tier I to IV, concurrent maintainability, fault tolerance, and TIA-942 ratings. Read the guide → ### [Energy Efficiency & PUE](https://datacentertraining.us/learn/energy-efficiency-pue.html) What PUE measures, where energy goes, and the changes that lower it. Read the guide → ### [AI & High-Density Facilities](https://datacentertraining.us/learn/ai-data-centers.html) What GPU racks change for power, liquid cooling, safety, and the people who run them. Read the guide → ### [800 VDC Power Safety](https://datacentertraining.us/learn/800-vdc-data-center-safety.html) High-voltage DC for AI racks: DC arc and shock hazards, test equipment, NFPA 70E, and qualification. Read the guide → Running the Site ## Operations, Safety, Security, and Water ### [Safety Guide](https://datacentertraining.us/learn/data-center-safety.html) Arc flash, LOTO, batteries, EPO, clean agents, and confined spaces. Read the guide → ### [Safety Checklist](https://datacentertraining.us/learn/data-center-safety-checklist.html) A printable walkthrough checklist by area, from switchgear and battery rooms to contractor work. Use the checklist → ### [Security & Compliance](https://datacentertraining.us/learn/data-center-security-compliance.html) Layers of physical security, plus SOC 2, ISO 27001, and PCI DSS. Read the guide → ### [Operations & Maintenance](https://datacentertraining.us/learn/data-center-operations.html) Shifts, MOPs, change control, maintenance, monitoring, and incidents. Read the guide → ### [Commissioning](https://datacentertraining.us/learn/data-center-commissioning.html) Levels 1 to 5, integrated systems testing, and handover. Read the guide → ### [Water Usage](https://datacentertraining.us/learn/data-center-water-usage.html) How much water data centers use, WUE, and how it compares with a golf course. Read the guide → ### [Maintenance Program](https://datacentertraining.us/learn/data-center-maintenance-program.html) Build a preventive maintenance program from asset list to KPIs. Read the guide → ### [Fire Suppression](https://datacentertraining.us/learn/data-center-fire-suppression.html) Clean agents, preaction sprinklers, VESDA, and restoring compliance. Read the guide → ### [Anti-Tailgating](https://datacentertraining.us/learn/anti-tailgating.html) Mantraps, portals, turnstiles, and anti-passback. Read the guide → ### [Security Guards](https://datacentertraining.us/learn/data-center-security-guards.html) Armed vs. unarmed officers, duties, licensing, and training. Read the guide → Reference ## Look It Up ### [Data Center Glossary](https://datacentertraining.us/learn/glossary.html) From ATS to WUE: more than 200 data center terms and acronyms explained in plain English, with links to go deeper. Open the glossary → ### [Standards & Regulations](https://datacentertraining.us/learn/data-center-standards.html) ANSI/TIA-942, Uptime Tiers, NFPA 70E and 75, OSHA, ASHRAE, ISO 27001, SOC 2, and who enforces what. Read the guide → - [UPS](https://datacentertraining.us/learn/glossary.html#term-ups) - [PUE](https://datacentertraining.us/learn/glossary.html#term-pue) - [ATS](https://datacentertraining.us/learn/glossary.html#term-ats) - [CRAH](https://datacentertraining.us/learn/glossary.html#term-crah) - [DCIM](https://datacentertraining.us/learn/glossary.html#term-dcim) - [EPO](https://datacentertraining.us/learn/glossary.html#term-epo) - [Arc flash](https://datacentertraining.us/learn/glossary.html#term-arc-flash) - [N+1](https://datacentertraining.us/learn/glossary.html#term-n-plus-1) - [2N](https://datacentertraining.us/learn/glossary.html#term-2n) - [MOP](https://datacentertraining.us/learn/glossary.html#term-mop) - [Tier III](https://datacentertraining.us/learn/glossary.html#term-tier-iii) Practice ## Test Yourself, Then Run the Numbers [Quiz](https://datacentertraining.us/quizzes/career-quiz.html) ### Which Career Fits You? Ten questions to find your path. Find my match → [Quizzes](https://datacentertraining.us/quizzes/) ### Knowledge Quizzes Power, cooling, safety, security, Tiers, and operations. See all quizzes → [Tool](https://datacentertraining.us/tools/pue-calculator.html) ### PUE Calculator Efficiency, overhead cost, and savings. Open the tool → [Tools](https://datacentertraining.us/tools/) ### All Calculators Uptime, cooling load, and a training plan builder. See all tools → Ready to Go Deeper? ## Turn Knowledge Into Job Skills The guides explain how things work. The courses teach you to do the work: self-paced, online, with a certificate of completion for every course. ### [Data Center Design Fundamentals](https://datacentertraining.us/courses/data-center-design-fundamentals.html) Design & Planning · Comprehensive Program · ANSI/TIA-942 Design data center facilities that scale — from site selection to redundancy strategy. 8 hrs $312.99 - [Enroll](https://datacentertraining.us/checkout.html?item=data-center-design-fundamentals) - [Add to Cart](https://datacentertraining.us/cart.html?add=data-center-design-fundamentals) ### [Power Systems & Electrical Fundamentals](https://datacentertraining.us/courses/power-systems-electrical-fundamentals.html) Power & Electrical · Comprehensive Program · NFPA 70E Master data center electrical infrastructure — from utility interconnection to UPS and PDU architecture. 8 hrs $303.99 - [Enroll](https://datacentertraining.us/checkout.html?item=power-systems-electrical-fundamentals) - [Add to Cart](https://datacentertraining.us/cart.html?add=power-systems-electrical-fundamentals) ### [Cooling Systems Design & Optimization](https://datacentertraining.us/courses/cooling-systems-design-optimization.html) Cooling & Efficiency · Comprehensive Program · PUE / ASHRAE Thermal Guidelines Cut cooling costs and improve reliability with modern thermal management strategy. 8 hrs $298.99 - [Enroll](https://datacentertraining.us/checkout.html?item=cooling-systems-design-optimization) - [Add to Cart](https://datacentertraining.us/cart.html?add=cooling-systems-design-optimization) ### [Data Center Operations Management](https://datacentertraining.us/courses/data-center-operations-management.html) Operations · Comprehensive Program · DCIM / SLA Frameworks Run daily operations like the teams behind Tier 3/4 facilities — maintenance, incident response, and SLAs. 8 hrs $325.99 - [Enroll](https://datacentertraining.us/checkout.html?item=data-center-operations-management) - [Add to Cart](https://datacentertraining.us/cart.html?add=data-center-operations-management) ### [Security & Compliance for Data Centers](https://datacentertraining.us/courses/security-compliance-data-centers.html) Security & Compliance · Comprehensive Program · SOC 2 / ISO 27001 Build a facility security program that satisfies SOC 2, ISO 27001, and physical audit requirements. 8 hrs $291.99 - [Enroll](https://datacentertraining.us/checkout.html?item=security-compliance-data-centers) - [Add to Cart](https://datacentertraining.us/cart.html?add=security-compliance-data-centers) Save 52% with the bundle Complete Data Center Professional Bundle 43 courses · 184 hours · **$2,928.99** per seat, instead of ~~$6,067.57~~ bought separately - [Enroll in the Bundle](https://datacentertraining.us/checkout.html?item=bundle-complete-catalog) - [Compare Bundles](https://datacentertraining.us/bundles.html) ## Not Sure Which Course to Take? Build a plan for your role in about a minute, or tell us about your team and we'll recommend one. - [Build a Training Plan](https://datacentertraining.us/tools/training-plan-builder.html) - [Browse All Courses](https://datacentertraining.us/courses.html) - [Call 1-866-429-6742](tel:18664296742) --- Markdown version of https://datacentertraining.us/learn/ · For AI agents: [llms.txt](https://datacentertraining.us/llms.txt) · [Developer portal](https://datacentertraining.us/developers/)